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Shared-Travel-Map-Front-End/node_modules/reflect-metadata/docs/index.html

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  1. <!doctype html>

  2. <head><meta charset="utf-8">

  3. <title>Metadata Proposal - ECMAScript</title>

  4. <link rel="stylesheet" href="ecmarkup.css">

  5. <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/github.min.css">

  6. <script src="ecmarkup.js"></script>

  7. <script>

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  13. 

  14. function Search(menu) {

  15.   this.menu = menu;

  16.   this.$search = document.getElementById('menu-search');

  17.   this.$searchBox = document.getElementById('menu-search-box');

  18.   this.$searchResults = document.getElementById('menu-search-results');

  19.   

  20.   this.loadBiblio();

  21.   

  22.   document.addEventListener('keydown', this.documentKeydown.bind(this));

  23.   

  24.   this.$searchBox.addEventListener('keydown', debounce(this.searchBoxKeydown.bind(this), { stopPropagation: true }));

  25.   this.$searchBox.addEventListener('keyup', debounce(this.searchBoxKeyup.bind(this), { stopPropagation: true }));

  26. }

  27. 

  28. Search.prototype.loadBiblio = function () {

  29.   var $biblio = document.getElementById('menu-search-biblio');

  30.   if (!$biblio) {

  31.     this.biblio = {};

  32.   } else {

  33.     this.biblio = JSON.parse($biblio.textContent);

  34.     this.biblio.clauses = this.biblio.filter(function (e) { return e.type === 'clause' });

  35.     this.biblio.clausesById = this.biblio.clauses.reduce(function (map, entry) {

  36.       map[entry.id] = entry;

  37.       return map;

  38.     }, {});

  39.   }

  40. }

  41. 

  42. Search.prototype.documentKeydown = function (e) {

  43.   if (e.keyCode === 191) {

  44.     e.preventDefault();

  45.     e.stopPropagation();

  46.     this.triggerSearch();

  47.   }

  48. }

  49. 

  50. Search.prototype.searchBoxKeydown = function (e) {

  51.   e.stopPropagation();

  52.   e.preventDefault();

  53.   if (e.keyCode === 191 && e.target.value.length === 0) {

  54.     e.preventDefault();

  55.   } else if (e.keyCode === 13) {

  56.     e.preventDefault();

  57.     this.selectResult();

  58.   }

  59. }

  60. 

  61. Search.prototype.searchBoxKeyup = function (e) {

  62.   if (e.keyCode === 13 || e.keyCode === 9) {

  63.     return;

  64.   }

  65.   

  66.   this.search(e.target.value);

  67. }

  68. 

  69. 

  70. Search.prototype.triggerSearch = function (e) {

  71.   if (this.menu.isVisible()) {

  72.     this._closeAfterSearch = false;

  73.   } else {

  74.     this._closeAfterSearch = true;

  75.     this.menu.show();

  76.   }

  77. 

  78.   this.$searchBox.focus();

  79.   this.$searchBox.select();

  80. }

  81. // bit 12 - Set if the result starts with searchString

  82. // bits 8-11: 8 - number of chunks multiplied by 2 if cases match, otherwise 1.

  83. // bits 1-7: 127 - length of the entry

  84. // General scheme: prefer case sensitive matches with fewer chunks, and otherwise

  85. // prefer shorter matches.

  86. function relevance(result, searchString) {

  87.   var relevance = 0;

  88.   

  89.   relevance = Math.max(0, 8 - result.match.chunks) << 7;

  90.   

  91.   if (result.match.caseMatch) {

  92.     relevance *= 2;

  93.   }

  94.   

  95.   if (result.match.prefix) {

  96.     relevance += 2048

  97.   }

  98.   

  99.   relevance += Math.max(0, 255 - result.entry.key.length);

  100.   

  101.   return relevance;

  102. }

  103. 

  104. Search.prototype.search = function (searchString) {

  105.   var s = Date.now();

  106. 

  107.   if (searchString === '') {

  108.     this.displayResults([]);

  109.     this.hideSearch();

  110.     return;

  111.   } else {

  112.     this.showSearch();

  113.   }

  114.   

  115.   if (searchString.length === 1) {

  116.     this.displayResults([]);

  117.     return;

  118.   }

  119.     

  120.   var results;

  121. 

  122.   if (/^[\d\.]*$/.test(searchString)) {

  123.     results = this.biblio.clauses.filter(function (clause) {

  124.       return clause.number.substring(0, searchString.length) === searchString;

  125.     }).map(function (clause) {

  126.       return { entry: clause };

  127.     });

  128.   } else {

  129.     results = [];

  130.     

  131.     for (var i = 0; i < this.biblio.length; i++) {

  132.       var entry = this.biblio[i];

  133.   

  134.       var match = fuzzysearch(searchString, entry.key);

  135.       if (match) {

  136.         results.push({ entry: entry, match: match });

  137.       }

  138.     }

  139.   

  140.     results.forEach(function (result) {

  141.       result.relevance = relevance(result, searchString);

  142.     });

  143.     

  144.     results = results.sort(function (a, b) { return b.relevance - a.relevance });

  145. 

  146.   }

  147. 

  148.   if (results.length > 50) {

  149.     results = results.slice(0, 50);

  150.   }

  151.   

  152.   this.displayResults(results);

  153. }

  154. Search.prototype.hideSearch = function () {

  155.   this.$search.classList.remove('active');

  156. }

  157. 

  158. Search.prototype.showSearch = function () {

  159.   this.$search.classList.add('active');

  160. }

  161. 

  162. Search.prototype.selectResult = function () {

  163.   var $first = this.$searchResults.querySelector('li:first-child a');

  164. 

  165.   if ($first) {

  166.     document.location = $first.getAttribute('href');

  167.   }

  168.   

  169.   this.$searchBox.value = '';

  170.   this.$searchBox.blur();

  171.   this.displayResults([]);

  172.   this.hideSearch();

  173. 

  174.   if (this._closeAfterSearch) {

  175.     this.menu.hide();

  176.   }

  177. }

  178. 

  179. Search.prototype.displayResults = function (results) {

  180.   if (results.length > 0) {

  181.     this.$searchResults.classList.remove('no-results');

  182.     

  183.     var html = '<ul>';

  184. 

  185.     results.forEach(function (result) {

  186.       var entry = result.entry;

  187.       var id = entry.id;

  188.       var cssClass = '';

  189.       var text = '';

  190. 

  191.       if (entry.type === 'clause') {

  192.         var number = entry.number ? entry.number + ' ' : '';

  193.         text = number + entry.key;

  194.         cssClass = 'clause';

  195.         id = entry.id;

  196.       } else if (entry.type === 'production') {

  197.         text = entry.key;

  198.         cssClass = 'prod';

  199.         id = entry.id;  

  200.       } else if (entry.type === 'op') {

  201.         text = entry.key;

  202.         cssClass = 'op';

  203.         id = entry.refId;

  204.       } else if (entry.type === 'term') {

  205.         text = entry.key;

  206.         cssClass = 'term';

  207.         id = entry.id || entry.refId;

  208.       }

  209. 

  210.       if (text) {

  211.         html += '<li class=menu-search-result-' + cssClass + '><a href="#' + id + '">' + text + '</a></li>'

  212.       }

  213.     });

  214. 

  215.     html += '</ul>'

  216. 

  217.     this.$searchResults.innerHTML = html;

  218.   } else {

  219.     this.$searchResults.innerHTML = '';

  220.     this.$searchResults.classList.add('no-results');

  221.   }

  222. }

  223. 

  224. 

  225. function Menu() {

  226.   this.$toggle = document.getElementById('menu-toggle');

  227.   this.$menu = document.getElementById('menu');

  228.   this.$toc = document.querySelector('menu-toc > ol');

  229.   this.$pins = document.querySelector('#menu-pins');

  230.   this.$pinList = document.getElementById('menu-pins-list');

  231.   this.$toc = document.querySelector('#menu-toc > ol');

  232.   this.$specContainer = document.getElementById('spec-container');

  233.   this.search = new Search(this);

  234.   

  235.   this._pinnedIds = {}; 

  236.   this.loadPinEntries();

  237. 

  238.   // toggle menu

  239.   this.$toggle.addEventListener('click', this.toggle.bind(this));

  240. 

  241.   // keydown events for pinned clauses

  242.   document.addEventListener('keydown', this.documentKeydown.bind(this));

  243. 

  244.   // toc expansion

  245.   var tocItems = this.$menu.querySelectorAll('#menu-toc li');

  246.   for (var i = 0; i < tocItems.length; i++) {

  247.     var $item = tocItems[i];

  248.     $item.addEventListener('click', function($item, event) {

  249.       $item.classList.toggle('active');

  250.       event.stopPropagation();

  251.     }.bind(null, $item));

  252.   }

  253. 

  254.   // close toc on toc item selection

  255.   var tocLinks = this.$menu.querySelectorAll('#menu-toc li > a');

  256.   for (var i = 0; i < tocLinks.length; i++) {

  257.     var $link = tocLinks[i];

  258.     $link.addEventListener('click', function(event) {

  259.       this.toggle();

  260.       event.stopPropagation();

  261.     }.bind(this));

  262.   }

  263. 

  264.   // update active clause on scroll

  265.   window.addEventListener('scroll', debounce(this.updateActiveClause.bind(this)));

  266.   this.updateActiveClause();

  267. 

  268.   // prevent menu scrolling from scrolling the body

  269.   this.$toc.addEventListener('wheel', function (e) {

  270.     var target = e.currentTarget;

  271.     var offTop = e.deltaY < 0 && target.scrollTop === 0;

  272.     if (offTop) {

  273.       e.preventDefault();

  274.     }

  275.     var offBottom = e.deltaY > 0

  276.                     && target.offsetHeight + target.scrollTop >= target.scrollHeight;

  277. 

  278.     if (offBottom) {

  279. 		  event.preventDefault();

  280. 	  }

  281.   })

  282. 

  283.   // handle pinning clauses via the pin link

  284.   document.addEventListener('click', function (e) {

  285.     if (e.target.classList.contains('utils-pin')) {

  286.       var id = e.target.parentNode.parentNode.parentNode.parentNode.id;

  287.       this.togglePinEntry(id);

  288.     }

  289.   }.bind(this))

  290. }

  291. 

  292. Menu.prototype.documentKeydown = function (e) {

  293.   e.stopPropagation();

  294.   if (e.keyCode === 80) {

  295.     this.togglePinEntry();

  296.   } else if (e.keyCode > 48 && e.keyCode < 58) {

  297.     this.selectPin(e.keyCode - 49);

  298.   }

  299. }

  300. 

  301. Menu.prototype.updateActiveClause = function () {

  302.   this.setActiveClause(findActiveClause(this.$specContainer))

  303. }

  304. 

  305. Menu.prototype.setActiveClause = function (clause) {

  306.   this.$activeClause = clause;

  307.   this.revealInToc(this.$activeClause);

  308. }

  309. 

  310. Menu.prototype.revealInToc = function (path) {

  311.   var current = this.$toc.querySelectorAll('li.revealed');

  312.   for (var i = 0; i < current.length; i++) {

  313.     current[i].classList.remove('revealed');

  314.     current[i].classList.remove('revealed-leaf');

  315.   }

  316.   

  317.   var current = this.$toc;

  318.   var index = 0;

  319.   while (index < path.length) {

  320.     var children = current.children;

  321.     for (var i = 0; i < children.length; i++) {

  322.       if ('#' + path[index].id === children[i].children[1].getAttribute('href') ) {

  323.         children[i].classList.add('revealed');

  324.         if (index === path.length - 1) {

  325.           children[i].classList.add('revealed-leaf');

  326.           var rect = children[i].getBoundingClientRect();

  327.           this.$toc.getBoundingClientRect().top

  328.           var tocRect = this.$toc.getBoundingClientRect();

  329.           if (rect.top + 10 > tocRect.bottom) {

  330.             this.$toc.scrollTop = this.$toc.scrollTop + (rect.top - tocRect.bottom) + (rect.bottom - rect.top);

  331.           } else if (rect.top < tocRect.top) {

  332.             this.$toc.scrollTop = this.$toc.scrollTop - (tocRect.top - rect.top);

  333.           }

  334.         }

  335.         current = children[i].querySelector('ol');

  336.         index++;

  337.         break;

  338.       }      

  339.     }

  340.     

  341.   }

  342. }

  343. 

  344. function findActiveClause(root, path) {

  345.   var clauses = new ClauseWalker(root);

  346.   var $clause;

  347.   var found = false;

  348.   var path = path || [];

  349.   

  350.   while ($clause = clauses.nextNode()) {

  351.     var rect = $clause.getBoundingClientRect();

  352.     var $header = $clause.children[0];

  353.     var marginTop = parseInt(getComputedStyle($header)["margin-top"]);

  354.     

  355.     if ((rect.top - marginTop) <= 0 && rect.bottom > 0) {

  356.       found = true;

  357.       return findActiveClause($clause, path.concat($clause)) || path;

  358.     }

  359.   }

  360.   

  361.   return path;

  362. }

  363. 

  364. function ClauseWalker(root) {

  365.   var previous;

  366.   var treeWalker = document.createTreeWalker(

  367.     root,

  368.     NodeFilter.SHOW_ELEMENT,

  369.     {

  370.       acceptNode: function (node) {

  371.         if (previous === node.parentNode) {

  372.           return NodeFilter.FILTER_REJECT;

  373.         } else {

  374.           previous = node;

  375.         }

  376.         if (node.nodeName === 'EMU-CLAUSE' || node.nodeName === 'EMU-INTRO' || node.nodeName === 'EMU-ANNEX') {

  377.           return NodeFilter.FILTER_ACCEPT;

  378.         } else {

  379.           return NodeFilter.FILTER_SKIP;

  380.         }

  381.       }

  382.     },

  383.     false

  384.     );

  385.   

  386.   return treeWalker;

  387. }

  388. 

  389. Menu.prototype.toggle = function () {

  390.   this.$menu.classList.toggle('active');

  391. }

  392. 

  393. Menu.prototype.show = function () {

  394.   this.$menu.classList.add('active');

  395. }

  396. 

  397. Menu.prototype.hide = function () {

  398.   this.$menu.classList.remove('active');

  399. }

  400. 

  401. Menu.prototype.isVisible = function() {

  402.   return this.$menu.classList.contains('active');

  403. }

  404. 

  405. Menu.prototype.showPins = function () {

  406.   this.$pins.classList.add('active');

  407. }

  408. 

  409. Menu.prototype.hidePins = function () {

  410.   this.$pins.classList.remove('active');

  411. }

  412. 

  413. Menu.prototype.addPinEntry = function (id) {

  414.   var entry = this.search.biblio.clausesById[id];

  415.   var prefix;

  416.   if (entry.number) {

  417.     prefix = entry.number + ' ';

  418.   } else {

  419.     prefix = '';

  420.   }

  421.   this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + prefix + entry.titleHTML + '</a></li>';

  422.   if (Object.keys(this._pinnedIds).length === 0) {

  423.     this.showPins();

  424.   }

  425.   this._pinnedIds[id] = true;

  426.   this.persistPinEntries();

  427. }

  428. 

  429. Menu.prototype.removePinEntry = function (id) {

  430.   var item = this.$pinList.querySelector('a[href="#' + id + '"]').parentNode;

  431.   this.$pinList.removeChild(item);

  432.   delete this._pinnedIds[id];

  433.   if (Object.keys(this._pinnedIds).length === 0) {

  434.     this.hidePins();

  435.   }

  436. 

  437.   this.persistPinEntries();

  438. }

  439. 

  440. Menu.prototype.persistPinEntries = function () {

  441.   try {

  442.     if (!window.localStorage) return;

  443.   } catch (e) {

  444.     return;

  445.   }

  446. 

  447.   localStorage.pinEntries = JSON.stringify(Object.keys(this._pinnedIds));

  448. }

  449. 

  450. Menu.prototype.loadPinEntries = function () {

  451.   try {

  452.     if (!window.localStorage) return;

  453.   } catch (e) {

  454.     return;

  455.   }

  456.   

  457.   var pinsString = window.localStorage.pinEntries;

  458.   if (!pinsString) return;

  459.   var pins = JSON.parse(pinsString);

  460.   for(var i = 0; i < pins.length; i++) {

  461.     this.addPinEntry(pins[i]);

  462.   }

  463. }

  464. 

  465. Menu.prototype.togglePinEntry = function (id) {

  466.   if (!id) {

  467.     id = this.$activeClause[this.$activeClause.length - 1].id;

  468.   }

  469. 

  470.   if (this._pinnedIds[id]) {

  471.     this.removePinEntry(id);

  472.   } else {

  473.     this.addPinEntry(id);

  474.   }

  475. }

  476. 

  477. Menu.prototype.selectPin = function (num) {

  478.   document.location = this.$pinList.children[num].children[0].href;

  479. }

  480. 

  481. function init() {

  482.   var menu = new Menu();

  483. }

  484. 

  485. document.addEventListener('DOMContentLoaded', init);

  486. 

  487. function debounce(fn, opts) {

  488.   opts = opts || {};

  489.   var timeout;

  490.   return function(e) {

  491.     if (opts.stopPropagation) {

  492.       e.stopPropagation();

  493.     }

  494.     var args = arguments;

  495.     if (timeout) {

  496.       clearTimeout(timeout);

  497.     }

  498.     timeout = setTimeout(function() {

  499.       timeout = null;

  500.       fn.apply(this, args);

  501.     }.bind(this), 150);

  502.   }

  503. }

  504. 

  505. 

  506. 

  507. 

  508. var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX'];

  509. function findLocalReferences ($elem) {

  510.   var name = $elem.innerHTML;

  511.   var references = [];

  512. 

  513.   var parentClause = $elem.parentNode;

  514.   while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) {

  515.     parentClause = parentClause.parentNode;

  516.   }

  517. 

  518.   if(!parentClause) return;

  519. 

  520.   var vars = parentClause.querySelectorAll('var');

  521. 

  522.   for (var i = 0; i < vars.length; i++) {

  523.     var $var = vars[i];

  524. 

  525.     if ($var.innerHTML === name) {

  526.       references.push($var);

  527.     }

  528.   }

  529. 

  530.   return references;

  531. }

  532. 

  533. function toggleFindLocalReferences($elem) {

  534.   var references = findLocalReferences($elem);

  535.   if ($elem.classList.contains('referenced')) {

  536.     references.forEach(function ($reference) {

  537.       $reference.classList.remove('referenced');

  538.     });

  539.   } else {

  540.     references.forEach(function ($reference) {

  541.       $reference.classList.add('referenced');

  542.     });

  543.   }

  544. }

  545. 

  546. function installFindLocalReferences () {

  547.   document.addEventListener('click', function (e) {

  548.     if (e.target.nodeName === 'VAR') {

  549.       toggleFindLocalReferences(e.target);

  550.     }

  551.   });

  552. }

  553. 

  554. document.addEventListener('DOMContentLoaded', installFindLocalReferences);

  555. 

  556. 

  557. 

  558. 

  559. // The following license applies to the fuzzysearch function

  560. // The MIT License (MIT)

  561. // Copyright © 2015 Nicolas Bevacqua

  562. // Copyright © 2016 Brian Terlson

  563. // Permission is hereby granted, free of charge, to any person obtaining a copy of

  564. // this software and associated documentation files (the "Software"), to deal in

  565. // the Software without restriction, including without limitation the rights to

  566. // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of

  567. // the Software, and to permit persons to whom the Software is furnished to do so,

  568. // subject to the following conditions:

  569. 

  570. // The above copyright notice and this permission notice shall be included in all

  571. // copies or substantial portions of the Software.

  572. 

  573. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  574. // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS

  575. // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR

  576. // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER

  577. // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

  578. // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

  579. function fuzzysearch (searchString, haystack, caseInsensitive) {

  580.   var tlen = haystack.length;

  581.   var qlen = searchString.length;

  582.   var chunks = 1;

  583.   var finding = false;

  584.   var prefix = true;

  585.   

  586.   if (qlen > tlen) {

  587.     return false;

  588.   }

  589.   

  590.   if (qlen === tlen) {

  591.     if (searchString === haystack) {

  592.       return { caseMatch: true, chunks: 1, prefix: true };

  593.     } else if (searchString.toLowerCase() === haystack.toLowerCase()) {

  594.       return { caseMatch: false, chunks: 1, prefix: true };

  595.     } else {

  596.       return false;

  597.     }

  598.   }

  599.   

  600.   outer: for (var i = 0, j = 0; i < qlen; i++) {

  601.     var nch = searchString[i];

  602.     while (j < tlen) {

  603.       var targetChar = haystack[j++];

  604.       if (targetChar === nch) {

  605.         finding = true;

  606.         continue outer;

  607.       }

  608.       if (finding) {

  609.         chunks++;

  610.         finding = false;

  611.       }

  612.     }

  613.     

  614.     if (caseInsensitive) { return false }

  615.     

  616.     return fuzzysearch(searchString.toLowerCase(), haystack.toLowerCase(), true);

  617.   }

  618.   

  619.   return { caseMatch: !caseInsensitive, chunks: chunks, prefix: j <= qlen };

  620. }

  621. var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX'];

  622. function findLocalReferences ($elem) {

  623.   var name = $elem.innerHTML;

  624.   var references = [];

  625. 

  626.   var parentClause = $elem.parentNode;

  627.   while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) {

  628.     parentClause = parentClause.parentNode;

  629.   }

  630. 

  631.   if(!parentClause) return;

  632. 

  633.   var vars = parentClause.querySelectorAll('var');

  634. 

  635.   for (var i = 0; i < vars.length; i++) {

  636.     var $var = vars[i];

  637. 

  638.     if ($var.innerHTML === name) {

  639.       references.push($var);

  640.     }

  641.   }

  642. 

  643.   return references;

  644. }

  645. 

  646. function toggleFindLocalReferences($elem) {

  647.   var references = findLocalReferences($elem);

  648.   if ($elem.classList.contains('referenced')) {

  649.     references.forEach(function ($reference) {

  650.       $reference.classList.remove('referenced');

  651.     });

  652.   } else {

  653.     references.forEach(function ($reference) {

  654.       $reference.classList.add('referenced');

  655.     });

  656.   }

  657. }

  658. 

  659. function installFindLocalReferences () {

  660.   document.addEventListener('click', function (e) {

  661.     if (e.target.nodeName === 'VAR') {

  662.       toggleFindLocalReferences(e.target);

  663.     }

  664.   });

  665. }

  666. 

  667. document.addEventListener('DOMContentLoaded', installFindLocalReferences);

  668. </script><style>body {

  669.   display: flex;

  670.   font-size: 18px;

  671.   line-height: 1.5;

  672.   font-family: Cambria, Palatino Linotype, Palatino, Liberation Serif, serif;

  673.   padding: 0;

  674.   margin: 0;

  675.   color: #111;

  676. }

  677. 

  678. #spec-container {

  679.   padding-left: 20px;

  680.   flex-grow: 1;

  681.   flex-basis: 66%;

  682.   box-sizing: border-box;

  683.   overflow: hidden;

  684. }

  685. 

  686. body.oldtoc {

  687.   margin: 0 auto;

  688. }

  689. 

  690. a {

  691.     text-decoration: none;

  692.     color: #206ca7;

  693. }

  694. 

  695. a:visited {

  696.   color: #206ca7;

  697. }

  698. 

  699. a:hover {

  700.     text-decoration: underline;

  701.     color: #239dee;

  702. }

  703. 

  704. 

  705. code {

  706.     font-weight: bold;

  707.     font-family: Consolas, Monaco, monospace;

  708.     white-space: pre;

  709. }

  710. 

  711. pre code {

  712.   font-weight: inherit;

  713. }

  714. 

  715. pre code.hljs {

  716.   background-color: #fff;

  717.   margin: 0;

  718.   padding: 0;

  719. }

  720. 

  721. ol.toc {

  722.     list-style: none;

  723.     padding-left: 0;

  724. }

  725. 

  726. ol.toc ol.toc {

  727.     padding-left: 2ex;

  728.     list-style: none;

  729. }

  730. 

  731. var {

  732.   color: #2aa198;

  733.   transition: background-color 0.25s ease;

  734.   cursor: pointer;

  735. }

  736. 

  737. var.referenced {

  738.   background-color: #ffff33;

  739. }

  740. 

  741. emu-const {

  742.   font-family: sans-serif;

  743. }

  744. 

  745. emu-val {

  746.   font-weight: bold;

  747. }

  748. emu-alg ol, emu-alg ol ol ol ol {

  749.     list-style-type: decimal;

  750. }

  751. 

  752. emu-alg ol ol, emu-alg ol ol ol ol ol {

  753.     list-style-type: lower-alpha;

  754. }

  755. 

  756. emu-alg ol ol ol, ol ol ol ol ol ol {

  757.     list-style-type: lower-roman;

  758. }

  759. 

  760. emu-eqn {

  761.   display: block;

  762.   margin-left: 4em;

  763. }

  764. 

  765. emu-eqn.inline {

  766.   display: inline;

  767.   margin: 0;

  768. }

  769. 

  770. emu-eqn div:first-child {

  771.   margin-left: -2em;

  772. }

  773. 

  774. emu-note {

  775.     margin: 1em 0;

  776.     color: #666;

  777.     border-left: 5px solid #ccc;

  778.     display: flex;

  779.     flex-direction: row;

  780. }

  781. 

  782. emu-note > span.note {

  783.     flex-basis: 100px;

  784.     min-width: 100px;

  785.     flex-grow: 0;

  786.     flex-shrink: 1;

  787.     text-transform: uppercase;

  788.     padding-left: 5px;

  789. }

  790. 

  791. emu-note[type=editor] {

  792.   border-left-color: #faa;

  793. }

  794. 

  795. emu-note > div.note-contents {

  796.   flex-grow: 1;

  797.   flex-shrink: 1;

  798. }

  799. 

  800. emu-note > div.note-contents > p:first-child {

  801.   margin-top: 0;

  802. }

  803. 

  804. emu-note > div.note-contents > p:last-child {

  805.   margin-bottom: 0;

  806. }

  807. 

  808. emu-example {

  809.   display: block;

  810.   margin: 1em 3em;

  811. }

  812. 

  813. emu-example figure figcaption {

  814.   margin-top: 0.5em;

  815.   text-align: left;

  816. }

  817. 

  818. emu-production {

  819.     display: block;

  820.     margin-top: 1em;

  821.     margin-bottom: 1em;

  822.     margin-left: 5ex;

  823. }

  824. 

  825. 

  826. emu-grammar.inline, emu-production.inline,

  827. emu-grammar.inline emu-production emu-rhs, emu-production.inline emu-rhs {

  828.   display: inline;

  829. }

  830. 

  831. emu-grammar[collapsed] emu-production, emu-production[collapsed] {

  832.     margin: 0;

  833. }

  834. 

  835. emu-grammar[collapsed] emu-production emu-rhs, emu-production[collapsed] emu-rhs {

  836.     display: inline;

  837.     padding-left: 1ex;

  838. }

  839. 

  840. emu-constraints {

  841.     font-size: .75em;

  842.     margin-right: 1ex;

  843. }

  844. 

  845. emu-gann {

  846.     margin-right: 1ex;

  847. }

  848. 

  849. emu-gann emu-t:last-child,

  850. emu-gann emu-nt:last-child {

  851.     margin-right: 0;

  852. }

  853. 

  854. emu-geq {

  855.     margin-left: 1ex;

  856.     font-weight: bold;

  857. }

  858. 

  859. emu-oneof {

  860.     font-weight: bold;

  861.     margin-left: 1ex;

  862. }

  863. 

  864. emu-nt {

  865.     display: inline-block;

  866.     font-style: italic;

  867.     white-space: nowrap;

  868.     text-indent: 0;

  869. }

  870. 

  871. emu-nt a, emu-nt a:visited {

  872.   color: #333;

  873. }

  874. 

  875. emu-rhs emu-nt {

  876.     margin-right: 1ex;

  877. }

  878. 

  879. emu-t {

  880.     display: inline-block;

  881.     font-family: monospace;

  882.     font-weight: bold;

  883.     white-space: nowrap;

  884.     text-indent: 0;

  885. }

  886. 

  887. emu-production emu-t {

  888.     margin-right: 1ex;

  889. }

  890. 

  891. emu-rhs {

  892.     display: block;

  893.     padding-left: 75px;

  894.     text-indent: -25px;

  895. }

  896. 

  897. emu-mods {

  898.     font-size: .85em;

  899.     vertical-align: sub;

  900.     font-style: normal;

  901.     font-weight: normal;

  902. }

  903. 

  904. emu-production[collapsed] emu-mods {

  905.   display: none;

  906. }

  907. 

  908. emu-params, emu-opt {

  909.   margin-right: 1ex;

  910.   font-family: monospace;

  911. }

  912. 

  913. emu-params, emu-constraints {

  914.   color: #2aa198;

  915. }

  916. 

  917. emu-opt {

  918.   color: #b58900;

  919. }

  920. 

  921. emu-gprose {

  922.     font-size: 0.9em;

  923.     font-family: Helvetica, Arial, sans-serif;

  924. }

  925. 

  926. h1.shortname {

  927.   color: #f60;

  928.   font-size: 1.5em;

  929.   margin: 0;

  930. }

  931. 

  932. h1.version {

  933.   color: #f60;

  934.   font-size: 1.5em;

  935.   margin: 0;

  936. }

  937. 

  938. h1.title {

  939.   margin-top: 0;

  940.   color: #f60;

  941. }

  942. 

  943. h1.first {

  944.   margin-top: 0;

  945. }

  946. 

  947. h1, h2, h3, h4, h5, h6 {

  948.     position: relative;

  949. }

  950. 

  951. h1 .secnum {

  952.   text-decoration: none;

  953.   margin-right: 10px;

  954. }

  955. 

  956. h1 span.title {

  957.   order: 2;

  958. }

  959. 

  960. 

  961. h1 { font-size: 2.67em; margin-top: 2em; margin-bottom: 1em; line-height: 1em;}

  962. h2 { font-size: 2em; }

  963. h3 { font-size: 1.56em; }

  964. h4 { font-size: 1.25em; }

  965. h5 { font-size: 1.11em; }

  966. h6 { font-size: 1em; }

  967. 

  968. h1:hover span.utils {

  969.   display: block;

  970. }

  971. 

  972. span.utils {

  973.   font-size: 18px;

  974.   line-height: 18px;

  975.   display: none;

  976.   position: absolute;

  977.   top: 100%;

  978.   left: 0;

  979.   right: 0;

  980.   font-weight: normal;

  981. }

  982. 

  983. span.utils:before {

  984.     content: "⤷";

  985.     display: inline-block;

  986.     padding: 0 5px;

  987. }

  988. 

  989. span.utils > * {

  990.   display: inline-block;

  991.   margin-right: 20px;

  992. }

  993. 

  994. h1 span.utils span.anchor a,

  995. h2 span.utils span.anchor a,

  996. h3 span.utils span.anchor a,

  997. h4 span.utils span.anchor a,

  998. h5 span.utils span.anchor a,

  999. h6 span.utils span.anchor a {

  1000.   text-decoration: none;

  1001.   font-variant: small-caps;

  1002. }

  1003. 

  1004. h1 span.utils span.anchor a:hover,

  1005. h2 span.utils span.anchor a:hover,

  1006. h3 span.utils span.anchor a:hover,

  1007. h4 span.utils span.anchor a:hover,

  1008. h5 span.utils span.anchor a:hover,

  1009. h6 span.utils span.anchor a:hover {

  1010.   color: #333;

  1011. }

  1012. 

  1013. emu-intro h1, emu-clause h1, emu-annex h1 { font-size: 2em; }

  1014. emu-intro h2, emu-clause h2, emu-annex h2 { font-size: 1.56em; }

  1015. emu-intro h3, emu-clause h3, emu-annex h3 { font-size: 1.25em; }

  1016. emu-intro h4, emu-clause h4, emu-annex h4 { font-size: 1.11em; }

  1017. emu-intro h5, emu-clause h5, emu-annex h5 { font-size: 1em; }

  1018. emu-intro h6, emu-clause h6, emu-annex h6 { font-size: 0.9em; }

  1019. emu-intro emu-intro h1, emu-clause emu-clause h1, emu-annex emu-annex h1 { font-size: 1.56em; }

  1020. emu-intro emu-intro h2, emu-clause emu-clause h2, emu-annex emu-annex h2 { font-size: 1.25em; }

  1021. emu-intro emu-intro h3, emu-clause emu-clause h3, emu-annex emu-annex h3 { font-size: 1.11em; }

  1022. emu-intro emu-intro h4, emu-clause emu-clause h4, emu-annex emu-annex h4 { font-size: 1em; }

  1023. emu-intro emu-intro h5, emu-clause emu-clause h5, emu-annex emu-annex h5 { font-size: 0.9em; }

  1024. emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex h1 { font-size: 1.25em; }

  1025. emu-intro emu-intro emu-intro h2, emu-clause emu-clause emu-clause h2, emu-annex emu-annex emu-annex h2 { font-size: 1.11em; }

  1026. emu-intro emu-intro emu-intro h3, emu-clause emu-clause emu-clause h3, emu-annex emu-annex emu-annex h3 { font-size: 1em; }

  1027. emu-intro emu-intro emu-intro h4, emu-clause emu-clause emu-clause h4, emu-annex emu-annex emu-annex h4 { font-size: 0.9em; }

  1028. emu-intro emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex emu-annex h1 { font-size: 1.11em; }

  1029. emu-intro emu-intro emu-intro emu-intro h2, emu-clause emu-clause emu-clause emu-clause h2, emu-annex emu-annex emu-annex emu-annex h2 { font-size: 1em; }

  1030. emu-intro emu-intro emu-intro emu-intro h3, emu-clause emu-clause emu-clause emu-clause h3, emu-annex emu-annex emu-annex emu-annex h3 { font-size: 0.9em; }

  1031. emu-intro emu-intro emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex emu-annex emu-annex h1 { font-size: 1em; }

  1032. emu-intro emu-intro emu-intro emu-intro emu-intro h2, emu-clause emu-clause emu-clause emu-clause emu-clause h2, emu-annex emu-annex emu-annex emu-annex emu-annex h2 { font-size: 0.9em; }

  1033. emu-intro emu-intro emu-intro emu-intro emu-intro emu-intro h1, emu-clause emu-clause emu-clause emu-clause emu-clause emu-clause h1, emu-annex emu-annex emu-annex emu-annex emu-annex emu-annex h1 { font-size: 0.9em }

  1034. 

  1035. emu-clause {

  1036.     display: block;

  1037. }

  1038. 

  1039. /* Figures and tables */

  1040. figure { display: block; margin: 1em 0 3em 0; }

  1041. figure object { display: block; margin: 0 auto; }

  1042. figure table.real-table { margin: 0 auto; }

  1043. figure figcaption {

  1044.     display: block;

  1045.     color: #555555;

  1046.     font-weight: bold;

  1047.     text-align: center;

  1048. }

  1049. 

  1050. emu-table table {

  1051.   margin: 0 auto;

  1052. }

  1053. 

  1054. emu-table table, table.real-table {

  1055.     border-collapse: collapse;

  1056. }

  1057. 

  1058. emu-table td, emu-table th, table.real-table td, table.real-table th {

  1059.     border: 1px solid black;

  1060.     padding: 0.4em;

  1061.     vertical-align: baseline;

  1062. }

  1063. emu-table th, emu-table thead td, table.real-table th {

  1064.     background-color: #eeeeee;

  1065. }

  1066. 

  1067. /* Note: the left content edges of table.lightweight-table >tbody >tr >td

  1068.    and div.display line up. */

  1069. table.lightweight-table {

  1070.     border-collapse: collapse;

  1071.     margin: 0 0 0 1.5em;

  1072. }

  1073. table.lightweight-table td, table.lightweight-table th {

  1074.     border: none;

  1075.     padding: 0 0.5em;

  1076.     vertical-align: baseline;

  1077. }

  1078. 

  1079. /* diff styles */

  1080. ins {

  1081.     background-color: #e0f8e0;

  1082.     text-decoration: none;

  1083.     border-bottom: 1px solid #396;

  1084. }

  1085. 

  1086. del {

  1087.     background-color: #fee;

  1088. }

  1089. 

  1090. ins.block, del.block,

  1091. emu-production > ins, emu-production > del,

  1092. emu-grammar > ins, emu-grammar > del {

  1093.   display: block;

  1094. }

  1095. 

  1096. /* Menu Styles */

  1097. #menu-toggle {

  1098.   font-size: 2em;

  1099. 

  1100.   position: fixed;

  1101.   top: 0;

  1102.   left: 0;

  1103.   width: 1.5em;

  1104.   height: 1.5em;

  1105.   z-index: 3;

  1106.   visibility: hidden;

  1107.   color: #1567a2;

  1108.   background-color: #fff;

  1109. 

  1110.   line-height: 1.5em;

  1111.   text-align: center;

  1112.   -webkit-touch-callout: none;

  1113.   -webkit-user-select: none;

  1114.   -khtml-user-select: none;

  1115.   -moz-user-select: none;

  1116.   -ms-user-select: none;

  1117.   user-select: none;;

  1118. 

  1119.   cursor: pointer;

  1120. }

  1121. 

  1122. #menu {

  1123.   display: flex;

  1124.   flex-direction: column;

  1125.   width: 33%; height: 100vh;

  1126.   max-width: 500px;

  1127.   box-sizing: border-box;

  1128.   background-color: #ddd;

  1129.   overflow: hidden;

  1130.   transition: opacity 0.1s linear;

  1131.   padding: 0 5px;

  1132.   position: fixed;

  1133.   left: 0; top: 0;

  1134. 

  1135.   z-index: 2;

  1136. }

  1137. 

  1138. #menu-spacer {

  1139.   flex-basis: 33%;

  1140.   max-width: 500px;

  1141.   flex-grow: 0;

  1142.   flex-shrink: 0;

  1143. }

  1144. 

  1145. #menu a {

  1146.   color: #1567a2;

  1147. }

  1148. 

  1149. #menu.active {

  1150.   display: flex;

  1151.   opacity: 1;

  1152.   z-index: 2;

  1153. }

  1154. 

  1155. #menu-pins {

  1156.   flex-grow: 1;

  1157.   display: none;

  1158. }

  1159. 

  1160. #menu-pins.active {

  1161.   display: block;

  1162. }

  1163. 

  1164. #menu-pins-list {

  1165.   margin: 0;

  1166.   padding: 0;

  1167.   counter-reset: pins-counter;

  1168. }

  1169. 

  1170. #menu-pins-list > li:before {

  1171.   content: counter(pins-counter);

  1172.   counter-increment: pins-counter;

  1173.   display: inline-block;

  1174.   width: 25px;

  1175.   text-align: center;

  1176.   border: 1px solid #bbb;

  1177.   padding: 2px;

  1178.   margin: 4px;

  1179.   box-sizing: border-box;

  1180.   line-height: 1em;

  1181.   background-color: #ccc;

  1182.   border-radius: 4px;

  1183. }

  1184. #menu-toc > ol {

  1185.   padding: 0;

  1186.   flex-grow: 1;

  1187. }

  1188. 

  1189. #menu-toc > ol li {

  1190.   padding: 0;

  1191. }

  1192. 

  1193. #menu-toc > ol , #menu-toc > ol ol {

  1194.   list-style-type: none;

  1195.   margin: 0;

  1196.   padding: 0;

  1197. }

  1198. 

  1199. #menu-toc > ol ol {

  1200.   padding-left: 0.75em;

  1201. }

  1202. 

  1203. #menu-toc li {

  1204.   text-overflow: ellipsis;

  1205.   overflow: hidden;

  1206.   white-space: nowrap;

  1207. }

  1208. 

  1209. #menu-toc .item-toggle {

  1210.   display: inline-block;

  1211.   transform: rotate(-45deg) translate(-5px, -5px);

  1212.   transition: transform 0.1s ease;

  1213.   text-align: center;

  1214.   width: 20px;

  1215. 

  1216.   color: #aab;

  1217. 

  1218.   -webkit-touch-callout: none;

  1219.   -webkit-user-select: none;

  1220.   -khtml-user-select: none;

  1221.   -moz-user-select: none;

  1222.   -ms-user-select: none;

  1223.   user-select: none;;

  1224. 

  1225.   cursor: pointer;

  1226. }

  1227. 

  1228. #menu-toc .item-toggle-none {

  1229.   display: inline-block;

  1230.   width: 20px;

  1231. }

  1232. 

  1233. #menu-toc li.active > .item-toggle {

  1234.   transform: rotate(45deg) translate(-5px, -5px);

  1235. }

  1236. 

  1237. #menu-toc li > ol {

  1238.   display: none;

  1239. }

  1240. 

  1241. #menu-toc li.active > ol {

  1242.   display: block;

  1243. }

  1244. 

  1245. #menu-toc li.revealed > a {

  1246.   background-color: #bbb;

  1247.   font-weight: bold;

  1248.   /*

  1249.   background-color: #222;

  1250.   color: #c6d8e4;

  1251.   */

  1252. }

  1253. 

  1254. #menu-toc li.revealed-leaf> a {

  1255.   color: #206ca7;

  1256.   /*

  1257.   background-color: #222;

  1258.   color: #c6d8e4;

  1259.   */

  1260. }

  1261. 

  1262. #menu-toc li.revealed > .item-toggle {

  1263.   transform: rotate(45deg) translate(-5px, -5px);

  1264. }

  1265. 

  1266. #menu-toc li.revealed > ol {

  1267.   display: block;

  1268. }

  1269. 

  1270. #menu-toc li > a {

  1271.   padding: 2px 5px;

  1272. }

  1273. 

  1274. #menu > * {

  1275.   margin-bottom: 5px;

  1276. }

  1277. 

  1278. .menu-pane-header {

  1279.   padding: 0 5px;

  1280.   text-transform: uppercase;

  1281.   background-color: #aaa;

  1282.   color: #335;

  1283.   font-weight: bold;

  1284.   letter-spacing: 2px;

  1285.   flex-grow: 0;

  1286.   flex-shrink: 0;

  1287.   font-size: 0.8em;

  1288. }

  1289. 

  1290. #menu-toc {

  1291.   display: flex;

  1292.   flex-direction: column;

  1293.   width: 100%;

  1294.   overflow: hidden;

  1295.   flex-grow: 1;

  1296. }

  1297. 

  1298. #menu-toc ol.toc {

  1299.   overflow-x: hidden;

  1300.   overflow-y: auto;

  1301. }

  1302. 

  1303. #menu-search {

  1304.   position: relative;

  1305.   flex-grow: 0;

  1306.   flex-shrink: 0;

  1307.   width: 100%;

  1308.   

  1309.   display: flex;

  1310.   flex-direction: column;

  1311.   

  1312.   max-height: 300px;

  1313. }

  1314. 

  1315. #menu-trace-list {

  1316.   display: none;

  1317. }

  1318. 

  1319. #menu-search-box {

  1320.   box-sizing: border-box;

  1321.   display: block;

  1322.   width: 100%;

  1323.   margin: 5px 0 0 0;

  1324.   font-size: 1em;

  1325.   padding: 2px;

  1326.   background-color: #bbb;

  1327.   border: 1px solid #999;

  1328. }

  1329. 

  1330. #menu-search-results {

  1331.   overflow-x: hidden;

  1332.   overflow-y: auto;

  1333. }

  1334. 

  1335. li.menu-search-result-clause:before {

  1336.     content: 'clause';

  1337.     width: 40px;

  1338.     display: inline-block;

  1339.     text-align: right;

  1340.     padding-right: 1ex;

  1341.     color: #666;

  1342.     font-size: 75%;

  1343. }

  1344. li.menu-search-result-op:before {

  1345.     content: 'op';

  1346.     width: 40px;

  1347.     display: inline-block;

  1348.     text-align: right;

  1349.     padding-right: 1ex;

  1350.     color: #666;

  1351.     font-size: 75%;

  1352. }

  1353. 

  1354. li.menu-search-result-prod:before {

  1355.     content: 'prod';

  1356.     width: 40px;

  1357.     display: inline-block;

  1358.     text-align: right;

  1359.     padding-right: 1ex;

  1360.     color: #666;

  1361.     font-size: 75%

  1362. }

  1363. 

  1364. 

  1365. li.menu-search-result-term:before {

  1366.     content: 'term';

  1367.     width: 40px;

  1368.     display: inline-block;

  1369.     text-align: right;

  1370.     padding-right: 1ex;

  1371.     color: #666;

  1372.     font-size: 75%

  1373. }

  1374. 

  1375. #menu-search-results ul {

  1376.   padding: 0 5px;

  1377.   margin: 0;

  1378. }

  1379. 

  1380. #menu-search-results li {

  1381.   white-space: nowrap;

  1382.   text-overflow: ellipsis;

  1383. }

  1384. 

  1385. 

  1386. #menu-trace-list {

  1387.   counter-reset: item;

  1388.   margin: 0 0 0 20px;

  1389.   padding: 0;

  1390. }

  1391. #menu-trace-list li {

  1392.   display: block;

  1393.   white-space: nowrap;

  1394. }

  1395. 

  1396. #menu-trace-list li .secnum:after {

  1397.   content: " ";

  1398. }

  1399. #menu-trace-list li:before {

  1400.     content: counter(item) " ";

  1401.     background-color: #222;

  1402.     counter-increment: item;

  1403.     color: #999;

  1404.     width: 20px;

  1405.     height: 20px;

  1406.     line-height: 20px;

  1407.     display: inline-block;

  1408.     text-align: center;

  1409.     margin: 2px 4px 2px 0;

  1410. }

  1411. 

  1412. @media (max-width: 1000px) {

  1413.   body {

  1414.     margin: 0;

  1415.     display: block;

  1416.   }

  1417. 

  1418.   #menu {

  1419.     display: none;

  1420.     padding-top: 3em;

  1421.     width: 450px;

  1422.   }

  1423. 

  1424.   #menu.active {

  1425.     position: fixed;

  1426.     height: 100%;

  1427.     left: 0;

  1428.     top: 0;

  1429.     right: 300px;

  1430.   }

  1431. 

  1432.   #menu-toggle {

  1433.     visibility: visible;

  1434.   }

  1435. 

  1436.   #spec-container {

  1437.     padding: 0 5px;

  1438.   }

  1439. }

  1440. 

  1441. @media only screen and (max-width: 800px) {

  1442.   #menu {

  1443.     width: 100%;

  1444.   }

  1445. 

  1446.   h1 .secnum:empty {

  1447.     margin: 0; padding: 0;

  1448.   }

  1449. }

  1450. </style></head><body><div id="menu-toggle">☰</div><div id="menu-spacer"></div><div id="menu"><div id="menu-search"><input type="text" id="menu-search-box" placeholder="Search..."><div id="menu-search-results" class="inactive"></div></div><div id="menu-pins"><div class="menu-pane-header">Pinned Clauses</div><ul id="menu-pins-list"></ul></div><div class="menu-pane-header">Table of Contents</div><div id="menu-toc"><ol class="toc"><li><span class="item-toggle-none"></span><a href="#introduction" title="Metadata Proposal - ECMAScript">Metadata Proposal - ECMAScript</a></li><li><span class="item-toggle-none"></span><a href="#syntax" title="Syntax"><span class="secnum">1</span> Syntax</a></li><li><span class="item-toggle">◢</span><a href="#abstract-operations" title="Abstract Operations"><span class="secnum">2</span> Abstract Operations</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#operations-on-objects" title="Operations on Objects"><span class="secnum">2.1</span> Operations on Objects</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#getorcreatemetadatamap" title="GetOrCreateMetadataMap ( O, P, Create )"><span class="secnum">2.1.1</span> GetOrCreateMetadataMap ( O, P, Create )</a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-and-exotic-objects-behaviors" title="Ordinary and Exotic Objects Behaviors"><span class="secnum">3</span> Ordinary and Exotic Objects Behaviors</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots" title="Ordinary Object Internal Methods and Internal Slots"><span class="secnum">3.1</span> Ordinary Object Internal Methods and Internal Slots</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-hasmetadata" title="[[HasMetadata]] ( MetadataKey, P )"><span class="secnum">3.1.1</span> [[HasMetadata]] ( MetadataKey, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinaryhasmetadata" title="OrdinaryHasMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.1.1</span> OrdinaryHasMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-hasownmetadata" title="[[HasOwnMetadata]] ( MetadataKey, P )"><span class="secnum">3.1.2</span> [[HasOwnMetadata]] ( MetadataKey, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinaryhasownmetadata" title="OrdinaryHasOwnMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.2.1</span> OrdinaryHasOwnMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-getmetadata" title="[[GetMetadata]] ( MetadataKey, P )"><span class="secnum">3.1.3</span> [[GetMetadata]] ( MetadataKey, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarygetmetadata" title="OrdinaryGetMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.3.1</span> OrdinaryGetMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-getownmetadata" title="[[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )"><span class="secnum">3.1.4</span> [[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarygetownmetadata" title="OrdinaryGetOwnMetadata ( MetadataKey, O, P )"><span class="secnum">3.1.4.1</span> OrdinaryGetOwnMetadata ( MetadataKey, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-defineownmetadata" title="[[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )"><span class="secnum">3.1.5</span> [[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarydefineownmetadata" title="OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )"><span class="secnum">3.1.5.1</span> OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-metadatakeys" title="[[MetadataKeys]] ( P )"><span class="secnum">3.1.6</span> [[MetadataKeys]] ( P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinarymetadatakeys" title="OrdinaryMetadataKeys ( O, P )"><span class="secnum">3.1.6.1</span> OrdinaryMetadataKeys ( O, P )</a></li></ol></li><li><span class="item-toggle">◢</span><a href="#ordinary-object-internal-methods-and-internal-slots-ownmetadatakeys" title="[[OwnMetadataKeys]] ( P )"><span class="secnum">3.1.7</span> [[OwnMetadataKeys]] ( P )</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#ordinaryownmetadatakeys" title="OrdinaryOwnMetadataKeys ( O, P )"><span class="secnum">3.1.7.1</span> OrdinaryOwnMetadataKeys ( O, P )</a></li></ol></li><li><span class="item-toggle-none"></span><a href="#ordinary-object-internal-methods-and-internal-slots-deletemetadata" title="[[DeleteMetadata]]( MetadataKey, P )"><span class="secnum">3.1.8</span> [[DeleteMetadata]]( MetadataKey, P )</a></li></ol></li></ol></li><li><span class="item-toggle">◢</span><a href="#reflection" title="Reflection"><span class="secnum">4</span> Reflection</a><ol class="toc"><li><span class="item-toggle">◢</span><a href="#reflect" title="The Reflect Object"><span class="secnum">4.1</span> The Reflect Object</a><ol class="toc"><li><span class="item-toggle-none"></span><a href="#reflect-metadatadecoratorfunctions" title="Metadata Decorator Functions"><span class="secnum">4.1.1</span> Metadata Decorator Functions</a></li><li><span class="item-toggle-none"></span><a href="#reflect.metadata" title="Reflect.metadata ( metadataKey, metadataValue )"><span class="secnum">4.1.2</span> Reflect.metadata ( metadataKey, metadataValue )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.definemetadata" title="Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )"><span class="secnum">4.1.3</span> Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.hasmetadata" title="Reflect.hasMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.4</span> Reflect.hasMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.hasownmetadata" title="Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.5</span> Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getmetadata" title="Reflect.getMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.6</span> Reflect.getMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getownmetadata" title="Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.7</span> Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getmetadatakeys" title="Reflect.getMetadataKeys ( target [, propertyKey] )"><span class="secnum">4.1.8</span> Reflect.getMetadataKeys ( target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.getownmetadatakeys" title="Reflect.getOwnMetadataKeys ( target [, propertyKey] )"><span class="secnum">4.1.9</span> Reflect.getOwnMetadataKeys ( target [, propertyKey] )</a></li><li><span class="item-toggle-none"></span><a href="#reflect.deletemetadata" title="Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )"><span class="secnum">4.1.10</span> Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )</a></li></ol></li></ol></li></ol></div></div><div id="spec-container">

  1451. 

  1452. <emu-intro id="introduction">

  1453.   <h1 class="first">Metadata Proposal - ECMAScript<span class="utils"><span class="anchor"><a href="#introduction">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1454.   <emu-note><span class="note">Note</span><div class="note-contents">A shim for this API can be found here:  <a href="https://github.com/rbuckton/ReflectDecorators">https://github.com/rbuckton/ReflectDecorators</a></div></emu-note>

  1455.   <p>Proposal to add Metadata to ECMAScript.</p>

  1456. </emu-intro>

  1457. 

  1458. <emu-clause id="syntax">

  1459.   <h1><span class="secnum">1</span>Syntax<span class="utils"><span class="anchor"><a href="#syntax">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1460.   <emu-note><span class="note">Note</span><div class="note-contents">This section is non-normative.</div></emu-note>

  1461.   <pre><code class="javascript hljs"><span class="hljs-comment">// define metadata on an object or property</span>

  1462. <span class="hljs-built_in">Reflect</span>.defineMetadata(metadataKey, metadataValue, target);

  1463. <span class="hljs-built_in">Reflect</span>.defineMetadata(metadataKey, metadataValue, target, propertyKey);

  1464. 

  1465. <span class="hljs-comment">// check for presence of a metadata key on the prototype chain of an object or property</span>

  1466. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasMetadata(metadataKey, target);

  1467. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasMetadata(metadataKey, target, propertyKey);

  1468. 

  1469. <span class="hljs-comment">// check for presence of an own metadata key of an object or property</span>

  1470. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasOwnMetadata(metadataKey, target);

  1471. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasOwnMetadata(metadataKey, target, propertyKey);

  1472. 

  1473. <span class="hljs-comment">// get metadata value of a metadata key on the prototype chain of an object or property</span>

  1474. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadata(metadataKey, target);

  1475. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadata(metadataKey, target, propertyKey);

  1476. 

  1477. <span class="hljs-comment">// get metadata value of an own metadata key of an object or property</span>

  1478. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadata(metadataKey, target);

  1479. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadata(metadataKey, target, propertyKey);

  1480. 

  1481. <span class="hljs-comment">// get all metadata keys on the prototype chain of an object or property</span>

  1482. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadataKeys(target);

  1483. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadataKeys(target, propertyKey);

  1484. 

  1485. <span class="hljs-comment">// get all own metadata keys of an object or property</span>

  1486. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadataKeys(target);

  1487. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadataKeys(target, propertyKey);

  1488. 

  1489. <span class="hljs-comment">// delete metadata from an object or property</span>

  1490. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.deleteMetadata(metadataKey, target);

  1491. <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.deleteMetadata(metadataKey, target, propertyKey);

  1492. 

  1493. <span class="hljs-comment">// apply metadata via a decorator to a constructor</span>

  1494. @<span class="hljs-built_in">Reflect</span>.metadata(metadataKey, metadataValue)

  1495. <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C</span> </span>{

  1496.   <span class="hljs-comment">// apply metadata via a decorator to a method (property)</span>

  1497.   @<span class="hljs-built_in">Reflect</span>.metadata(metadataKey, metadataValue)

  1498.   method() {

  1499.   }

  1500. }

  1501. 

  1502. <span class="hljs-comment">// Design-time type annotations</span>

  1503. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">Type</span>(<span class="hljs-params">type</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">Reflect</span>.metadata(<span class="hljs-string">"design:type"</span>, type); }

  1504. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ParamTypes</span>(<span class="hljs-params">...types</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">Reflect</span>.metadata(<span class="hljs-string">"design:paramtypes"</span>, types); }

  1505. <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">ReturnType</span>(<span class="hljs-params">type</span>) </span>{ <span class="hljs-keyword">return</span> <span class="hljs-built_in">Reflect</span>.metadata(<span class="hljs-string">"design:returntype"</span>, type); }

  1506. 

  1507. <span class="hljs-comment">// Decorator application</span>

  1508. @ParamTypes(<span class="hljs-built_in">String</span>, <span class="hljs-built_in">Number</span>)

  1509. <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C</span> </span>{

  1510.   <span class="hljs-keyword">constructor</span>(text, i) {

  1511.   }

  1512. 

  1513.   @Type(<span class="hljs-built_in">String</span>)

  1514.   get name() { <span class="hljs-keyword">return</span> <span class="hljs-string">"text"</span>; }

  1515. 

  1516.   @Type(<span class="hljs-built_in">Function</span>)

  1517.   @ParamTypes(<span class="hljs-built_in">Number</span>, <span class="hljs-built_in">Number</span>)

  1518.   @ReturnType(<span class="hljs-built_in">Number</span>)

  1519.   add(x, y) {

  1520.     <span class="hljs-keyword">return</span> x + y;

  1521.   }

  1522. }

  1523. 

  1524. <span class="hljs-comment">// Metadata introspection</span>

  1525. <span class="hljs-keyword">let</span> obj = <span class="hljs-keyword">new</span> C(<span class="hljs-string">"a"</span>, <span class="hljs-number">1</span>);

  1526. <span class="hljs-keyword">let</span> paramTypes = <span class="hljs-built_in">Reflect</span>.getMetadata(<span class="hljs-string">"design:paramtypes"</span>, inst, <span class="hljs-string">"add"</span>); <span class="hljs-comment">// [Number, Number]</span></code></pre>

  1527. </emu-clause>

  1528. 

  1529. <emu-clause id="abstract-operations">

  1530.   <h1><span class="secnum">2</span>Abstract Operations<span class="utils"><span class="anchor"><a href="#abstract-operations">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1531.   <emu-clause id="operations-on-objects">

  1532.     <h1><span class="secnum">2.1</span>Operations on Objects<span class="utils"><span class="anchor"><a href="#operations-on-objects">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1533.     <emu-clause id="getorcreatemetadatamap" aoid="GetOrCreateMetadataMap">

  1534.       <h1><span class="secnum">2.1.1</span>GetOrCreateMetadataMap ( O, P, Create )<span class="utils"><span class="anchor"><a href="#getorcreatemetadatamap">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1535.       <p>When the abstract operation GetOrCreateMetadataMap is called with Object <var>O</var>, property key <var>P</var>, and Boolean <var>Create</var> the following steps are taken:</p>

  1536.       <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>targetMetadata</var> be the value of <var>O</var>'s [[Metadata]] internal slot.</li><li>If <var>targetMetadata</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>Create</var> is <emu-val>false</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Set <var>targetMetadata</var> to be a newly created <emu-val>Map</emu-val> object.</li><li>Set the [[Metadata]] internal slot of <var>O</var> to <var>targetMetadata</var>.</li></ol></li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>targetMetadata</var>, <code>"get"</code>, <var>P</var>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, then<ol><li>If <var>Create</var> is <emu-val>false</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Set <var>metadataMap</var> to be a newly created <emu-val>Map</emu-val> object.</li><li>Perform ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>targetMetadata</var>, <code>"set"</code>, <var>P</var>, <var>metadataMap</var>).</li></ol></li><li>Return <var>metadataMap</var>.

  1537.       </li></ol></emu-alg>

  1538.     </emu-clause>

  1539.   </emu-clause>

  1540. </emu-clause>

  1541. 

  1542. <emu-clause id="ordinary-and-exotic-objects-behaviors">

  1543.   <h1><span class="secnum">3</span>Ordinary and Exotic Objects Behaviors<span class="utils"><span class="anchor"><a href="#ordinary-and-exotic-objects-behaviors">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1544. 

  1545.   <emu-clause id="ordinary-object-internal-methods-and-internal-slots">

  1546.     <h1><span class="secnum">3.1</span>Ordinary Object Internal Methods and Internal Slots<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1547.     <p>All ordinary objects have an internal slot called [[Metadata]]. The value of this internal slot is either <emu-val>null</emu-val> or a <emu-val>Map</emu-val> object and is used for storing metadata for an object.</p>

  1548.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-hasmetadata">

  1549.       <h1><span class="secnum">3.1.1</span>[[HasMetadata]] ( MetadataKey, P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-hasmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1550.       <p>When the [[HasMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>

  1551.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryHasMetadata"><a href="#ordinaryhasmetadata">OrdinaryHasMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).

  1552.       </li></ol></emu-alg>

  1553.       <emu-clause id="ordinaryhasmetadata" aoid="OrdinaryHasMetadata">

  1554.         <h1><span class="secnum">3.1.1.1</span>OrdinaryHasMetadata ( MetadataKey, O, P )<span class="utils"><span class="anchor"><a href="#ordinaryhasmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1555.         <p>When the abstract operation OrdinaryHasMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>

  1556.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>hasOwn</var> be ?&nbsp;<emu-xref aoid="OrdinaryHasOwnMetadata"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).</li><li>If <var>hasOwn</var> is <emu-val>true</emu-val>, return <emu-val>true</emu-val>.</li><li>Let <var>parent</var> be ? <var>O</var>.[[GetPrototypeOf]]().</li><li>If <var>parent</var> is not <emu-val>null</emu-val>, Return ? <var>parent</var>.[[HasMetadata]](<var>MetadataKey</var>, <var>P</var>).</li><li>Return <emu-val>false</emu-val>.

  1557.         </li></ol></emu-alg>

  1558.       </emu-clause>

  1559.     </emu-clause>

  1560. 

  1561.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-hasownmetadata">

  1562.       <h1><span class="secnum">3.1.2</span>[[HasOwnMetadata]] ( MetadataKey, P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-hasownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1563.       <p>When the [[HasOwnMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>

  1564.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryHasOwnMetadata"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).

  1565.       </li></ol></emu-alg>

  1566.       <emu-clause id="ordinaryhasownmetadata" aoid="OrdinaryHasOwnMetadata">

  1567.         <h1><span class="secnum">3.1.2.1</span>OrdinaryHasOwnMetadata ( MetadataKey, O, P )<span class="utils"><span class="anchor"><a href="#ordinaryhasownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1568.         <p>When the abstract operation OrdinaryHasOwnMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>

  1569.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="ToBoolean"><a href="https://tc39.github.io/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(? <emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"has"</code>, <var>MetadataKey</var>)).

  1570.         </li></ol></emu-alg>

  1571.       </emu-clause>

  1572.     </emu-clause>

  1573. 

  1574.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-getmetadata">

  1575.       <h1><span class="secnum">3.1.3</span>[[GetMetadata]] ( MetadataKey, P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-getmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1576.       <p>When the [[GetMatadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>

  1577.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryGetMetadata"><a href="#ordinarygetmetadata">OrdinaryGetMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).

  1578.       </li></ol></emu-alg>

  1579.       <emu-clause id="ordinarygetmetadata" aoid="OrdinaryGetMetadata">

  1580.         <h1><span class="secnum">3.1.3.1</span>OrdinaryGetMetadata ( MetadataKey, O, P )<span class="utils"><span class="anchor"><a href="#ordinarygetmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1581.         <p>When the abstract operation OrdinaryGetMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>

  1582.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>hasOwn</var> be ?&nbsp;<emu-xref aoid="OrdinaryHasOwnMetadata"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).</li><li>If <var>hasOwn</var> is <emu-val>true</emu-val>, return ?&nbsp;<emu-xref aoid="OrdinaryGetOwnMetadata"><a href="#ordinarygetownmetadata">OrdinaryGetOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).</li><li>Let <var>parent</var> be ? <var>O</var>.[[GetPrototypeOf]]().</li><li>If <var>parent</var> is not <emu-val>null</emu-val>, return ? <var>parent</var>.[[GetMetadata]](<var>MetadataKey</var>, <var>P</var>).</li><li>Return <emu-val>undefined</emu-val>.

  1583.         </li></ol></emu-alg>

  1584.       </emu-clause>

  1585.     </emu-clause>

  1586. 

  1587.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-getownmetadata">

  1588.       <h1><span class="secnum">3.1.4</span>[[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-getownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1589.       <p>When the [[GetOwnMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var>, the following steps are taken:</p>

  1590.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryGetOwnMetadata"><a href="#ordinarygetownmetadata">OrdinaryGetOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>).

  1591.       </li></ol></emu-alg>

  1592.       <emu-clause id="ordinarygetownmetadata" aoid="OrdinaryGetOwnMetadata">

  1593.         <h1><span class="secnum">3.1.4.1</span>OrdinaryGetOwnMetadata ( MetadataKey, O, P )<span class="utils"><span class="anchor"><a href="#ordinarygetownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1594.         <p>When the abstract operation OrdinaryGetOwnMetadata is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>

  1595.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <emu-val>undefined</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"get"</code>, <var>MetadataKey</var>).

  1596.         </li></ol></emu-alg>

  1597.       </emu-clause>

  1598.     </emu-clause>

  1599. 

  1600.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-defineownmetadata">

  1601.       <h1><span class="secnum">3.1.5</span>[[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-defineownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1602.       <p>When the [[DefineOwnMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataValue</var>, and property key <var>P</var>, the following steps are taken:</p>

  1603.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryDefineOwnMetadata"><a href="#ordinarydefineownmetadata">OrdinaryDefineOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>MetadataValue</var>, <var>O</var>, <var>P</var>)

  1604.       </li></ol></emu-alg>

  1605.       <emu-clause id="ordinarydefineownmetadata" aoid="OrdinaryDefineOwnMetadata">

  1606.         <h1><span class="secnum">3.1.5.1</span>OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )<span class="utils"><span class="anchor"><a href="#ordinarydefineownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1607.         <p>When the abstract operation <emu-xref aoid="OrdinaryDefineOwnProperty"><a href="https://tc39.github.io/ecma262/#sec-ordinarydefineownproperty">OrdinaryDefineOwnProperty</a></emu-xref> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var>, <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataValue</var>, Object <var>O</var>, and property key <var>P</var>, the following steps are taken:</p>

  1608.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>true</emu-val>).</li><li>Return ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"set"</code>, <var>MetadataKey</var>, <var>MetadataValue</var>).

  1609.         </li></ol></emu-alg>

  1610.       </emu-clause>

  1611.     </emu-clause>

  1612. 

  1613.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-metadatakeys">

  1614.       <h1><span class="secnum">3.1.6</span>[[MetadataKeys]] ( P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-metadatakeys">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1615.       <p>When the [[MetadataKeys]] internal method of <var>O</var> is called with property key <var>P</var> the following steps are taken:</p>

  1616.       <emu-alg><ol><li>Return ?&nbsp;<emu-xref aoid="OrdinaryMetadataKeys"><a href="#ordinarymetadatakeys">OrdinaryMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>).

  1617.       </li></ol></emu-alg>

  1618.       <emu-clause id="ordinarymetadatakeys" aoid="OrdinaryMetadataKeys">

  1619.         <h1><span class="secnum">3.1.6.1</span>OrdinaryMetadataKeys ( O, P )<span class="utils"><span class="anchor"><a href="#ordinarymetadatakeys">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1620.         <p>When the abstract operation OrdinaryMetadataKeys is called with Object <var>O</var> and property key <var>P</var> the following steps are taken:</p>

  1621.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>ownKeys</var> be ?&nbsp;<emu-xref aoid="OrdinaryOwnMetadataKeys"><a href="#ordinaryownmetadatakeys">OrdinaryOwnMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>).</li><li>Let <var>parent</var> be ? <var>O</var>.[[GetPrototypeOf]]().</li><li>If <var>parent</var> is <emu-val>null</emu-val>, then return <var>ownKeys</var>.</li><li>Let <var>parentKeys</var> be ? <var>O</var>.[[OrdinaryMetadataKeys]](<var>P</var>).</li><li>Let <var>ownKeysLen</var> = ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.github.io/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>ownKeys</var>, "length").</li><li>If <var>ownKeysLen</var> is <emu-val>0</emu-val>, return <var>parentKeys</var>.</li><li>Let <var>parentKeysLen</var> = ?&nbsp;<emu-xref aoid="Get"><a href="https://tc39.github.io/ecma262/#sec-get-o-p">Get</a></emu-xref>(<var>parentKeys</var>, "length").</li><li>If <var>parentKeysLen</var> is <emu-val>0</emu-val>, return <var>ownKeys</var>.</li><li>Let <var>set</var> be a newly created <emu-val>Set</emu-val> object.</li><li>Let <var>keys</var> be ?&nbsp;<emu-xref aoid="ArrayCreate"><a href="https://tc39.github.io/ecma262/#sec-arraycreate">ArrayCreate</a></emu-xref>(0).</li><li>Let <var>k</var> be <emu-val>0</emu-val>.</li><li>For each element <var>key</var> of <var>ownKeys</var><ol><li>Let <var>hasKey</var> be ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, <code>"has"</code>, <var>key</var>).</li><li>If <var>hasKey</var> is <emu-val>false</emu-val>, then<ol><li>Let <var>Pk</var> be !&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Perform ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, "add", <var>key</var>).</li><li>Let <var>defineStatus</var> be <emu-xref aoid="CreateDataProperty"><a href="https://tc39.github.io/ecma262/#sec-createdataproperty">CreateDataProperty</a></emu-xref>(<var>keys</var>, <var>Pk</var>, <var>key</var>).</li><li>Assert: <var>defineStatus</var> is <emu-val>true</emu-val>.</li><li>Increase <var>k</var> by <emu-val>1</emu-val>.</li></ol></li></ol></li><li>For each element <var>key</var> of <var>parentKeys</var><ol><li>Let <var>hasKey</var> be ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, <code>"has"</code>, <var>key</var>).</li><li>If <var>hasKey</var> is <emu-val>false</emu-val>, then<ol><li>Let <var>Pk</var> be !&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Perform ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>set</var>, <code>"add"</code>, <var>key</var>).</li><li>Let <var>defineStatus</var> be <emu-xref aoid="CreateDataProperty"><a href="https://tc39.github.io/ecma262/#sec-createdataproperty">CreateDataProperty</a></emu-xref>(<var>keys</var>, <var>Pk</var>, <var>key</var>).</li><li>Assert: <var>defineStatus</var> is <emu-val>true</emu-val>.</li><li>Increase <var>k</var> by <emu-val>1</emu-val>.</li></ol></li></ol></li><li>Perform ?&nbsp;<emu-xref aoid="Set"><a href="https://tc39.github.io/ecma262/#sec-set-o-p-v-throw">Set</a></emu-xref>(<var>keys</var>, <code>"length"</code>, <var>k</var>).</li><li>return <var>keys</var>.

  1622.         </li></ol></emu-alg>

  1623.       </emu-clause>

  1624.     </emu-clause>

  1625. 

  1626.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-ownmetadatakeys">

  1627.       <h1><span class="secnum">3.1.7</span>[[OwnMetadataKeys]] ( P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-ownmetadatakeys">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1628.       <p>When the [[OwnMetadataKeys]] internal method of <var>O</var> is called with property key <var>P</var> the following steps are taken:</p>

  1629.       <emu-alg><ol><li>Return <emu-xref aoid="OrdinaryOwnMetadataKeys"><a href="#ordinaryownmetadatakeys">OrdinaryOwnMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>).

  1630.       </li></ol></emu-alg>

  1631.       <emu-clause id="ordinaryownmetadatakeys" aoid="OrdinaryOwnMetadataKeys">

  1632.         <h1><span class="secnum">3.1.7.1</span>OrdinaryOwnMetadataKeys ( O, P )<span class="utils"><span class="anchor"><a href="#ordinaryownmetadatakeys">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1633.         <p>When the abstract operation OrdinaryOwnMetadataKeys is called with Object <var>O</var> and property key <var>P</var> the following steps are taken:</p>

  1634.         <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>keys</var> be ?&nbsp;<emu-xref aoid="ArrayCreate"><a href="https://tc39.github.io/ecma262/#sec-arraycreate">ArrayCreate</a></emu-xref>(0).</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <var>keys</var>.</li><li>Let <var>keysObj</var> be ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"keys"</code>).</li><li>Let <var>iterator</var> be ?&nbsp;<emu-xref aoid="GetIterator"><a href="https://tc39.github.io/ecma262/#sec-getiterator">GetIterator</a></emu-xref>(<var>keysObj</var>).</li><li>Let <var>k</var> be <emu-val>0</emu-val>.</li><li>Repeat<ol><li>Let <var>Pk</var> be !&nbsp;<emu-xref aoid="ToString"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Let <var>next</var> be ?&nbsp;<emu-xref aoid="IteratorStep"><a href="https://tc39.github.io/ecma262/#sec-iteratorstep">IteratorStep</a></emu-xref>(<var>iterator</var>).</li><li>If <var>next</var> is <emu-val>false</emu-val>, then<ol><li>Let <var>setStatus</var> be ?&nbsp;<emu-xref aoid="Set"><a href="https://tc39.github.io/ecma262/#sec-set-o-p-v-throw">Set</a></emu-xref>(<var>keys</var>, <code>"length"</code>, <var>k</var>, <var>true</var>).</li><li>Assert: <var>setStatus</var> is <emu-val>true</emu-val>.</li><li>Return <var>keys</var>.</li></ol></li><li>Let <var>nextValue</var> be ?&nbsp;<emu-xref aoid="IteratorValue"><a href="https://tc39.github.io/ecma262/#sec-iteratorvalue">IteratorValue</a></emu-xref>(<var>next</var>).</li><li>Let <var>defineStatus</var> be <emu-xref aoid="CreateDataPropertyOrThrow"><a href="https://tc39.github.io/ecma262/#sec-createdatapropertyorthrow">CreateDataPropertyOrThrow</a></emu-xref>(<var>keys</var>, <var>Pk</var>, <var>nextValue</var>).</li><li>If <var>defineStatus</var> is an <emu-xref href="#sec-completion-record-specification-type"><a href="https://tc39.github.io/ecma262/#sec-completion-record-specification-type">abrupt completion</a></emu-xref>, return ?&nbsp;<emu-xref aoid="IteratorClose"><a href="https://tc39.github.io/ecma262/#sec-iteratorclose">IteratorClose</a></emu-xref>(<var>iterator</var>, <var>defineStatus</var>).</li><li>Increase <var>k</var> by <emu-val>1</emu-val>.

  1635.         </li></ol></li></ol></emu-alg>

  1636.       </emu-clause>

  1637.     </emu-clause>

  1638. 

  1639.     <emu-clause id="ordinary-object-internal-methods-and-internal-slots-deletemetadata">

  1640.       <h1><span class="secnum">3.1.8</span>[[DeleteMetadata]]( MetadataKey, P )<span class="utils"><span class="anchor"><a href="#ordinary-object-internal-methods-and-internal-slots-deletemetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1641.       <p>When the [[DeleteMetadata]] internal method of <var>O</var> is called with <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref> <var>MetadataKey</var> and property key <var>P</var> the following steps are taken:</p>

  1642.       <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>P</var>) is <emu-val>true</emu-val>.</li><li>Let <var>metadataMap</var> be ?&nbsp;<emu-xref aoid="GetOrCreateMetadataMap"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>false</emu-val>).</li><li>If <var>metadataMap</var> is <emu-val>undefined</emu-val>, return <emu-val>false</emu-val>.</li><li>Return ?&nbsp;<emu-xref aoid="Invoke"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"delete"</code>, <var>MetadataKey</var>).

  1643.       </li></ol></emu-alg>

  1644.     </emu-clause>

  1645.   </emu-clause>

  1646. </emu-clause>

  1647. 

  1648. <emu-clause id="reflection">

  1649.   <h1><span class="secnum">4</span>Reflection<span class="utils"><span class="anchor"><a href="#reflection">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1650.   <emu-clause id="reflect">

  1651.     <h1><span class="secnum">4.1</span>The Reflect Object<span class="utils"><span class="anchor"><a href="#reflect">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1652.     <p>This section contains amendments to the Reflect object.</p>

  1653.     <emu-clause id="reflect-metadatadecoratorfunctions">

  1654.       <h1><span class="secnum">4.1.1</span>Metadata Decorator Functions<span class="utils"><span class="anchor"><a href="#reflect-metadatadecoratorfunctions">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1655.       <p>A metadata decorator function is an anonymous built-in function that has [[MetadataKey]] and [[MetadataValue]] internal slots.</p>

  1656.       <p>When a metadata decorator function <var>F</var> is called with arguments <var>target</var> and <var>key</var>, the following steps are taken:</p>

  1657.       <emu-alg><ol><li>Assert: <var>F</var> has a [[MetadataKey]] internal slot whose value is an <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>, or <emu-val>undefined</emu-val>.</li><li>Assert: <var>F</var> has a [[MetadataValue]] internal slot whose value is an <emu-xref href="#sec-ecmascript-language-types"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-language-types">ECMAScript language value</a></emu-xref>, or <emu-val>undefined</emu-val>.</li><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>If <var>key</var> is not <emu-val>undefined</emu-val> and <emu-xref aoid="IsPropertyKey"><a href="https://tc39.github.io/ecma262/#sec-ispropertykey">IsPropertyKey</a></emu-xref>(<var>key</var>) is <emu-val>false</emu-val>, throw a <emu-val>TypeError</emu-val> exception.</li><li>Let <var>metadataKey</var> be the value of <var>F</var>'s [[MetadataKey]] internal slot.</li><li>Let <var>metadataValue</var> be the value of <var>F</var>'s [[MetadataValue]] internal slot.</li><li>Perform ? <var>target</var>.[[DefineMetadata]](<var>metadataKey</var>, <var>metadataValue</var>, <var>target</var>, <var>key</var>).</li><li>Return <emu-val>undefined</emu-val>.

  1658.       </li></ol></emu-alg>

  1659.     </emu-clause>

  1660. 

  1661.     <emu-clause id="reflect.metadata">

  1662.       <h1><span class="secnum">4.1.2</span>Reflect.metadata ( metadataKey, metadataValue )<span class="utils"><span class="anchor"><a href="#reflect.metadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1663.       <p>When the <code>metadata</code> function is called with arguments <var>metadataKey</var> and <var>metadataValue</var>, the following steps are taken:</p>

  1664.       <emu-alg><ol><li>Let <var>decorator</var> be a new built-in function object as defined in Metadata Decorator Functions.</li><li>Set the [[MetadataKey]] internal slot of <var>decorator</var> to <var>metadataKey</var>.</li><li>Set the [[MetadataValue]] internal slot of <var>decorator</var> to <var>metadataValue</var>.</li><li>Return <var>decorator</var>.

  1665.       </li></ol></emu-alg>

  1666.     </emu-clause>

  1667. 

  1668.     <emu-clause id="reflect.definemetadata">

  1669.       <h1><span class="secnum">4.1.3</span>Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.definemetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1670.       <p>When the <code>defineMetadata</code> function is called with arguments <var>metadataKey</var>, <var>metadataValue</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>

  1671.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[DefineMetadata]](<var>metadataKey</var>, <var>metadataValue</var>, <var>propertyKey</var>).

  1672.       </li></ol></emu-alg>

  1673.     </emu-clause>

  1674. 

  1675.     <emu-clause id="reflect.hasmetadata">

  1676.       <h1><span class="secnum">4.1.4</span>Reflect.hasMetadata ( metadataKey, target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.hasmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1677.       <p>When the <code>hasMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>

  1678.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[HasMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).

  1679.       </li></ol></emu-alg>

  1680.     </emu-clause>

  1681. 

  1682.     <emu-clause id="reflect.hasownmetadata">

  1683.       <h1><span class="secnum">4.1.5</span>Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.hasownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1684.       <p>When the <code>hasOwnMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>

  1685.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[HasOwn]](<var>metadataKey</var>, <var>propertyKey</var>).

  1686.       </li></ol></emu-alg>

  1687.     </emu-clause>

  1688. 

  1689.     <emu-clause id="reflect.getmetadata">

  1690.       <h1><span class="secnum">4.1.6</span>Reflect.getMetadata ( metadataKey, target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.getmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1691.       <p>When the <code>getMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>

  1692.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).

  1693.       </li></ol></emu-alg>

  1694.     </emu-clause>

  1695. 

  1696.     <emu-clause id="reflect.getownmetadata">

  1697.       <h1><span class="secnum">4.1.7</span>Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.getownmetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1698.       <p>When the <code>getOwnMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>

  1699.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetOwnMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).

  1700.       </li></ol></emu-alg>

  1701.     </emu-clause>

  1702. 

  1703.     <emu-clause id="reflect.getmetadatakeys">

  1704.       <h1><span class="secnum">4.1.8</span>Reflect.getMetadataKeys ( target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.getmetadatakeys">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1705.       <p>When the <code>getMetadataKeys</code> function is called with arguments <var>target</var> and <var>propertyKey</var>, the following steps are taken:</p>

  1706.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetMetadataKeys]](<var>propertyKey</var>).

  1707.       </li></ol></emu-alg>

  1708.     </emu-clause>

  1709. 

  1710.     <emu-clause id="reflect.getownmetadatakeys">

  1711.       <h1><span class="secnum">4.1.9</span>Reflect.getOwnMetadataKeys ( target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.getownmetadatakeys">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1712.       <p>When the <code>getOwnMetadataKeys</code> function is called with arguments <var>target</var> and <var>propertyKey</var>, the following steps are taken:</p>

  1713.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[GetOwnMetadataKeys]](<var>propertyKey</var>).

  1714.       </li></ol></emu-alg>

  1715.     </emu-clause>

  1716. 

  1717.     <emu-clause id="reflect.deletemetadata">

  1718.       <h1><span class="secnum">4.1.10</span>Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )<span class="utils"><span class="anchor"><a href="#reflect.deletemetadata">link</a></span><span class="anchor"><a href="#" class="utils-pin">pin</a></span></span></h1>

  1719.       <p>When the <code>deleteMetadata</code> function is called with arguments <var>metadataKey</var>, <var>target</var>, and <var>propertyKey</var>, the following steps are taken:</p>

  1720.       <emu-alg><ol><li>If <emu-xref aoid="Type"><a href="https://tc39.github.io/ecma262/#sec-ecmascript-data-types-and-values">Type</a></emu-xref>(<var>target</var>) is not Object, throw a <emu-val>TypeError</emu-val> exception.</li><li>Return ? <var>target</var>.[[DeleteMetadata]](<var>metadataKey</var>, <var>propertyKey</var>).

  1721.       </li></ol></emu-alg>

  1722.     </emu-clause>

  1723.   </emu-clause>

  1724. </emu-clause></div></body>