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<!doctype html> <head><meta charset="utf-8"> <title>Metadata Proposal - ECMAScript</title> <link rel="stylesheet" href="ecmarkup.css"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/github.min.css"> <script src="ecmarkup.js"></script> <script> if (location.hostname === 'rbuckton.github.io' && location.protocol !== 'https:') { location.protocol = 'https:'; } </script> <script type="application/json" id="menu-search-biblio">[{"type":"clause","id":"introduction","aoid":null,"title":"Metadata Proposal - ECMAScript","titleHTML":"Metadata Proposal - ECMAScript","number":"","namespace":"https://rbuckton.github.io/reflect-metadata","location":"","referencingIds":[],"key":"Metadata Proposal - ECMAScript"},{"type":"clause","id":"syntax","aoid":null,"title":"Syntax","titleHTML":"Syntax","number":"1","namespace":"https://rbuckton.github.io/reflect-metadata","location":"","referencingIds":[],"key":"Syntax"},{"type":"op","aoid":"GetOrCreateMetadataMap","refId":"getorcreatemetadatamap","location":"","referencingIds":[],"key":"GetOrCreateMetadataMap"},{"type":"clause","id":"getorcreatemetadatamap","aoid":"GetOrCreateMetadataMap","title":"GetOrCreateMetadataMap ( O, P, Create )","titleHTML":"GetOrCreateMetadataMap ( O, P, Create )","number":"2.1.1","namespace":"https://rbuckton.github.io/reflect-metadata","location":"","referencingIds":["_ref_8","_ref_17","_ref_22","_ref_42","_ref_52"],"key":"GetOrCreateMetadataMap ( O, P, Create )"},{"type":"clause","id":"operations-on-objects","aoid":null,"title":"Operations on Objects","titleHTML":"Operations on Objects","number":"2.1","namespace":"https://rbuckton.github.io/reflect-metadata","location":"","referencingIds":[],"key":"Operations 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Object"},{"type":"clause","id":"reflection","aoid":null,"title":"Reflection","titleHTML":"Reflection","number":"4","namespace":"https://rbuckton.github.io/reflect-metadata","location":"","referencingIds":[],"key":"Reflection"}]</script><script>"use strict"; function Search(menu) { this.menu = menu; this.$search = document.getElementById('menu-search'); this.$searchBox = document.getElementById('menu-search-box'); this.$searchResults = document.getElementById('menu-search-results'); this.loadBiblio(); document.addEventListener('keydown', this.documentKeydown.bind(this)); this.$searchBox.addEventListener('keydown', debounce(this.searchBoxKeydown.bind(this), { stopPropagation: true })); this.$searchBox.addEventListener('keyup', debounce(this.searchBoxKeyup.bind(this), { stopPropagation: true })); } Search.prototype.loadBiblio = function () { var $biblio = document.getElementById('menu-search-biblio'); if (!$biblio) { this.biblio = []; } else { this.biblio = JSON.parse($biblio.textContent); this.biblio.clauses = this.biblio.filter(function (e) { return e.type === 'clause' }); this.biblio.byId = this.biblio.reduce(function (map, entry) { map[entry.id] = entry; return map; }, {}); } } Search.prototype.documentKeydown = function (e) { if (e.keyCode === 191) { e.preventDefault(); e.stopPropagation(); this.triggerSearch(); } } Search.prototype.searchBoxKeydown = function (e) { e.stopPropagation(); e.preventDefault(); if (e.keyCode === 191 && e.target.value.length === 0) { e.preventDefault(); } else if (e.keyCode === 13) { e.preventDefault(); this.selectResult(); } } Search.prototype.searchBoxKeyup = function (e) { if (e.keyCode === 13 || e.keyCode === 9) { return; } this.search(e.target.value); } Search.prototype.triggerSearch = function (e) { if (this.menu.isVisible()) { this._closeAfterSearch = false; } else { this._closeAfterSearch = true; this.menu.show(); } this.$searchBox.focus(); this.$searchBox.select(); } // bit 12 - Set if the result starts with searchString // bits 8-11: 8 - number of chunks multiplied by 2 if cases match, otherwise 1. // bits 1-7: 127 - length of the entry // General scheme: prefer case sensitive matches with fewer chunks, and otherwise // prefer shorter matches. function relevance(result, searchString) { var relevance = 0; relevance = Math.max(0, 8 - result.match.chunks) << 7; if (result.match.caseMatch) { relevance *= 2; } if (result.match.prefix) { relevance += 2048 } relevance += Math.max(0, 255 - result.entry.key.length); return relevance; } Search.prototype.search = function (searchString) { var s = Date.now(); if (searchString === '') { this.displayResults([]); this.hideSearch(); return; } else { this.showSearch(); } if (searchString.length === 1) { this.displayResults([]); return; } var results; if (/^[\d\.]*$/.test(searchString)) { results = this.biblio.clauses.filter(function (clause) { return clause.number.substring(0, searchString.length) === searchString; }).map(function (clause) { return { entry: clause }; }); } else { results = []; for (var i = 0; i < this.biblio.length; i++) { var entry = this.biblio[i]; if (!entry.key) { // biblio entries without a key aren't searchable continue; } var match = fuzzysearch(searchString, entry.key); if (match) { results.push({ entry: entry, match: match }); } } results.forEach(function (result) { result.relevance = relevance(result, searchString); }); results = results.sort(function (a, b) { return b.relevance - a.relevance }); } if (results.length > 50) { results = results.slice(0, 50); } this.displayResults(results); } Search.prototype.hideSearch = function () { this.$search.classList.remove('active'); } Search.prototype.showSearch = function () { this.$search.classList.add('active'); } Search.prototype.selectResult = function () { var $first = this.$searchResults.querySelector('li:first-child a'); if ($first) { document.location = $first.getAttribute('href'); } this.$searchBox.value = ''; this.$searchBox.blur(); this.displayResults([]); this.hideSearch(); if (this._closeAfterSearch) { this.menu.hide(); } } Search.prototype.displayResults = function (results) { if (results.length > 0) { this.$searchResults.classList.remove('no-results'); var html = '<ul>'; results.forEach(function (result) { var entry = result.entry; var id = entry.id; var cssClass = ''; var text = ''; if (entry.type === 'clause') { var number = entry.number ? entry.number + ' ' : ''; text = number + entry.key; cssClass = 'clause'; id = entry.id; } else if (entry.type === 'production') { text = entry.key; cssClass = 'prod'; id = entry.id; } else if (entry.type === 'op') { text = entry.key; cssClass = 'op'; id = entry.id || entry.refId; } else if (entry.type === 'term') { text = entry.key; cssClass = 'term'; id = entry.id || entry.refId; } if (text) { html += '<li class=menu-search-result-' + cssClass + '><a href="#' + id + '">' + text + '</a></li>' } }); html += '</ul>' this.$searchResults.innerHTML = html; } else { this.$searchResults.innerHTML = ''; this.$searchResults.classList.add('no-results'); } } function Menu() { this.$toggle = document.getElementById('menu-toggle'); this.$menu = document.getElementById('menu'); this.$toc = document.querySelector('menu-toc > ol'); this.$pins = document.querySelector('#menu-pins'); this.$pinList = document.getElementById('menu-pins-list'); this.$toc = document.querySelector('#menu-toc > ol'); this.$specContainer = document.getElementById('spec-container'); this.search = new Search(this); this._pinnedIds = {}; this.loadPinEntries(); // toggle menu this.$toggle.addEventListener('click', this.toggle.bind(this)); // keydown events for pinned clauses document.addEventListener('keydown', this.documentKeydown.bind(this)); // toc expansion var tocItems = this.$menu.querySelectorAll('#menu-toc li'); for (var i = 0; i < tocItems.length; i++) { var $item = tocItems[i]; $item.addEventListener('click', function($item, event) { $item.classList.toggle('active'); event.stopPropagation(); }.bind(null, $item)); } // close toc on toc item selection var tocLinks = this.$menu.querySelectorAll('#menu-toc li > a'); for (var i = 0; i < tocLinks.length; i++) { var $link = tocLinks[i]; $link.addEventListener('click', function(event) { this.toggle(); event.stopPropagation(); }.bind(this)); } // update active clause on scroll window.addEventListener('scroll', debounce(this.updateActiveClause.bind(this))); this.updateActiveClause(); // prevent menu scrolling from scrolling the body this.$toc.addEventListener('wheel', function (e) { var target = e.currentTarget; var offTop = e.deltaY < 0 && target.scrollTop === 0; if (offTop) { e.preventDefault(); } var offBottom = e.deltaY > 0 && target.offsetHeight + target.scrollTop >= target.scrollHeight; if (offBottom) { e.preventDefault(); } }) } Menu.prototype.documentKeydown = function (e) { e.stopPropagation(); if (e.keyCode === 80) { this.togglePinEntry(); } else if (e.keyCode > 48 && e.keyCode < 58) { this.selectPin(e.keyCode - 49); } } Menu.prototype.updateActiveClause = function () { this.setActiveClause(findActiveClause(this.$specContainer)) } Menu.prototype.setActiveClause = function (clause) { this.$activeClause = clause; this.revealInToc(this.$activeClause); } Menu.prototype.revealInToc = function (path) { var current = this.$toc.querySelectorAll('li.revealed'); for (var i = 0; i < current.length; i++) { current[i].classList.remove('revealed'); current[i].classList.remove('revealed-leaf'); } var current = this.$toc; var index = 0; while (index < path.length) { var children = current.children; for (var i = 0; i < children.length; i++) { if ('#' + path[index].id === children[i].children[1].getAttribute('href') ) { children[i].classList.add('revealed'); if (index === path.length - 1) { children[i].classList.add('revealed-leaf'); var rect = children[i].getBoundingClientRect(); this.$toc.getBoundingClientRect().top var tocRect = this.$toc.getBoundingClientRect(); if (rect.top + 10 > tocRect.bottom) { this.$toc.scrollTop = this.$toc.scrollTop + (rect.top - tocRect.bottom) + (rect.bottom - rect.top); } else if (rect.top < tocRect.top) { this.$toc.scrollTop = this.$toc.scrollTop - (tocRect.top - rect.top); } } current = children[i].querySelector('ol'); index++; break; } } } } function findActiveClause(root, path) { var clauses = new ClauseWalker(root); var $clause; var found = false; var path = path || []; while ($clause = clauses.nextNode()) { var rect = $clause.getBoundingClientRect(); var $header = $clause.children[0]; var marginTop = parseInt(getComputedStyle($header)["margin-top"]); if ((rect.top - marginTop) <= 0 && rect.bottom > 0) { found = true; return findActiveClause($clause, path.concat($clause)) || path; } } return path; } function ClauseWalker(root) { var previous; var treeWalker = document.createTreeWalker( root, NodeFilter.SHOW_ELEMENT, { acceptNode: function (node) { if (previous === node.parentNode) { return NodeFilter.FILTER_REJECT; } else { previous = node; } if (node.nodeName === 'EMU-CLAUSE' || node.nodeName === 'EMU-INTRO' || node.nodeName === 'EMU-ANNEX') { return NodeFilter.FILTER_ACCEPT; } else { return NodeFilter.FILTER_SKIP; } } }, false ); return treeWalker; } Menu.prototype.toggle = function () { this.$menu.classList.toggle('active'); } Menu.prototype.show = function () { this.$menu.classList.add('active'); } Menu.prototype.hide = function () { this.$menu.classList.remove('active'); } Menu.prototype.isVisible = function() { return this.$menu.classList.contains('active'); } Menu.prototype.showPins = function () { this.$pins.classList.add('active'); } Menu.prototype.hidePins = function () { this.$pins.classList.remove('active'); } Menu.prototype.addPinEntry = function (id) { var entry = this.search.biblio.byId[id]; if (!entry) { // id was deleted after pin (or something) so remove it delete this._pinnedIds[id]; this.persistPinEntries(); return; } if (entry.type === 'clause') { var prefix; if (entry.number) { prefix = entry.number + ' '; } else { prefix = ''; } this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + prefix + entry.titleHTML + '</a></li>'; } else { this.$pinList.innerHTML += '<li><a href="#' + entry.id + '">' + entry.key + '</a></li>'; } if (Object.keys(this._pinnedIds).length === 0) { this.showPins(); } this._pinnedIds[id] = true; this.persistPinEntries(); } Menu.prototype.removePinEntry = function (id) { var item = this.$pinList.querySelector('a[href="#' + id + '"]').parentNode; this.$pinList.removeChild(item); delete this._pinnedIds[id]; if (Object.keys(this._pinnedIds).length === 0) { this.hidePins(); } this.persistPinEntries(); } Menu.prototype.persistPinEntries = function () { try { if (!window.localStorage) return; } catch (e) { return; } localStorage.pinEntries = JSON.stringify(Object.keys(this._pinnedIds)); } Menu.prototype.loadPinEntries = function () { try { if (!window.localStorage) return; } catch (e) { return; } var pinsString = window.localStorage.pinEntries; if (!pinsString) return; var pins = JSON.parse(pinsString); for(var i = 0; i < pins.length; i++) { this.addPinEntry(pins[i]); } } Menu.prototype.togglePinEntry = function (id) { if (!id) { id = this.$activeClause[this.$activeClause.length - 1].id; } if (this._pinnedIds[id]) { this.removePinEntry(id); } else { this.addPinEntry(id); } } Menu.prototype.selectPin = function (num) { document.location = this.$pinList.children[num].children[0].href; } var menu; function init() { menu = new Menu(); var $container = document.getElementById('spec-container'); $container.addEventListener('mouseover', debounce(function (e) { Toolbox.activateIfMouseOver(e); })); } document.addEventListener('DOMContentLoaded', init); function debounce(fn, opts) { opts = opts || {}; var timeout; return function(e) { if (opts.stopPropagation) { e.stopPropagation(); } var args = arguments; if (timeout) { clearTimeout(timeout); } timeout = setTimeout(function() { timeout = null; fn.apply(this, args); }.bind(this), 150); } } var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX']; function findLocalReferences ($elem) { var name = $elem.innerHTML; var references = []; var parentClause = $elem.parentNode; while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) { parentClause = parentClause.parentNode; } if(!parentClause) return; var vars = parentClause.querySelectorAll('var'); for (var i = 0; i < vars.length; i++) { var $var = vars[i]; if ($var.innerHTML === name) { references.push($var); } } return references; } function toggleFindLocalReferences($elem) { var references = findLocalReferences($elem); if ($elem.classList.contains('referenced')) { references.forEach(function ($reference) { $reference.classList.remove('referenced'); }); } else { references.forEach(function ($reference) { $reference.classList.add('referenced'); }); } } function installFindLocalReferences () { document.addEventListener('click', function (e) { if (e.target.nodeName === 'VAR') { toggleFindLocalReferences(e.target); } }); } document.addEventListener('DOMContentLoaded', installFindLocalReferences); // The following license applies to the fuzzysearch function // The MIT License (MIT) // Copyright © 2015 Nicolas Bevacqua // Copyright © 2016 Brian Terlson // Permission is hereby granted, free of charge, to any person obtaining a copy of // this software and associated documentation files (the "Software"), to deal in // the Software without restriction, including without limitation the rights to // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of // the Software, and to permit persons to whom the Software is furnished to do so, // subject to the following conditions: // The above copyright notice and this permission notice shall be included in all // copies or substantial portions of the Software. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. function fuzzysearch (searchString, haystack, caseInsensitive) { var tlen = haystack.length; var qlen = searchString.length; var chunks = 1; var finding = false; var prefix = true; if (qlen > tlen) { return false; } if (qlen === tlen) { if (searchString === haystack) { return { caseMatch: true, chunks: 1, prefix: true }; } else if (searchString.toLowerCase() === haystack.toLowerCase()) { return { caseMatch: false, chunks: 1, prefix: true }; } else { return false; } } outer: for (var i = 0, j = 0; i < qlen; i++) { var nch = searchString[i]; while (j < tlen) { var targetChar = haystack[j++]; if (targetChar === nch) { finding = true; continue outer; } if (finding) { chunks++; finding = false; } } if (caseInsensitive) { return false } return fuzzysearch(searchString.toLowerCase(), haystack.toLowerCase(), true); } return { caseMatch: !caseInsensitive, chunks: chunks, prefix: j <= qlen }; } var Toolbox = { init: function () { this.$container = document.createElement('div'); this.$container.classList.add('toolbox'); this.$permalink = document.createElement('a'); this.$permalink.textContent = 'Permalink'; this.$pinLink = document.createElement('a'); this.$pinLink.textContent = 'Pin'; this.$pinLink.setAttribute('href', '#'); this.$pinLink.addEventListener('click', function (e) { e.preventDefault(); e.stopPropagation(); menu.togglePinEntry(this.entry.id); }.bind(this)); this.$refsLink = document.createElement('a'); this.$refsLink.setAttribute('href', '#'); this.$refsLink.addEventListener('click', function (e) { e.preventDefault(); e.stopPropagation(); referencePane.showReferencesFor(this.entry); }.bind(this)); this.$container.appendChild(this.$permalink); this.$container.appendChild(this.$pinLink); this.$container.appendChild(this.$refsLink); document.body.appendChild(this.$container); }, activate: function (el, entry, target) { if (el === this._activeEl) return; this.active = true; this.entry = entry; this.$container.classList.add('active'); this.top = el.offsetTop - this.$container.offsetHeight - 10; this.left = el.offsetLeft; this.$container.setAttribute('style', 'left: ' + this.left + 'px; top: ' + this.top + 'px'); this.updatePermalink(); this.updateReferences(); this._activeEl = el; if (this.top < document.body.scrollTop && el === target) { // don't scroll unless it's a small thing (< 200px) this.$container.scrollIntoView(); } }, updatePermalink: function () { this.$permalink.setAttribute('href', '#' + this.entry.id); }, updateReferences: function () { this.$refsLink.textContent = 'References (' + this.entry.referencingIds.length + ')'; }, activateIfMouseOver: function (e) { var ref = this.findReferenceUnder(e.target); if (ref && (!this.active || e.pageY > this._activeEl.offsetTop)) { var entry = menu.search.biblio.byId[ref.id]; this.activate(ref.element, entry, e.target); } else if (this.active && ((e.pageY < this.top) || e.pageY > (this._activeEl.offsetTop + this._activeEl.offsetHeight))) { this.deactivate(); } }, findReferenceUnder: function (el) { while (el) { var parent = el.parentNode; if (el.nodeName === 'H1' && parent.nodeName.match(/EMU-CLAUSE|EMU-ANNEX|EMU-INTRO/) && parent.id) { return { element: el, id: parent.id }; } else if (el.nodeName.match(/EMU-(?!CLAUSE|XREF|ANNEX|INTRO)|DFN/) && el.id && el.id[0] !== '_') { if (el.nodeName === 'EMU-FIGURE' || el.nodeName === 'EMU-TABLE' || el.nodeName === 'EMU-EXAMPLE') { // return the figcaption element return { element: el.children[0].children[0], id: el.id }; } else if (el.nodeName === 'EMU-PRODUCTION') { // return the LHS non-terminal element return { element: el.children[0], id: el.id }; } else { return { element: el, id: el.id }; } } el = parent; } }, deactivate: function () { this.$container.classList.remove('active'); this._activeEl = null; this.activeElBounds = null; this.active = false; } } var referencePane = { init: function() { this.$container = document.createElement('div'); this.$container.setAttribute('id', 'references-pane-container'); var $spacer = document.createElement('div'); $spacer.setAttribute('id', 'references-pane-spacer'); this.$pane = document.createElement('div'); this.$pane.setAttribute('id', 'references-pane'); this.$container.appendChild($spacer); this.$container.appendChild(this.$pane); this.$header = document.createElement('div'); this.$header.classList.add('menu-pane-header'); this.$header.textContent = 'References to '; this.$headerRefId = document.createElement('a'); this.$header.appendChild(this.$headerRefId); this.$closeButton = document.createElement('span'); this.$closeButton.setAttribute('id', 'references-pane-close'); this.$closeButton.addEventListener('click', function (e) { this.deactivate(); }.bind(this)); this.$header.appendChild(this.$closeButton); this.$pane.appendChild(this.$header); var tableContainer = document.createElement('div'); tableContainer.setAttribute('id', 'references-pane-table-container'); this.$table = document.createElement('table'); this.$table.setAttribute('id', 'references-pane-table'); this.$tableBody = this.$table.createTBody(); tableContainer.appendChild(this.$table); this.$pane.appendChild(tableContainer); menu.$specContainer.appendChild(this.$container); }, activate: function () { this.$container.classList.add('active'); }, deactivate: function () { this.$container.classList.remove('active'); }, showReferencesFor(entry) { this.activate(); var newBody = document.createElement('tbody'); var previousId; var previousCell; var dupCount = 0; this.$headerRefId.textContent = '#' + entry.id; this.$headerRefId.setAttribute('href', '#' + entry.id); entry.referencingIds.map(function (id) { var target = document.getElementById(id); var cid = findParentClauseId(target); var clause = menu.search.biblio.byId[cid]; var dupCount = 0; return { id: id, clause: clause } }).sort(function (a, b) { return sortByClauseNumber(a.clause, b.clause); }).forEach(function (record, i) { if (previousId === record.clause.id) { previousCell.innerHTML += ' (<a href="#' + record.id + '">' + (dupCount + 2) + '</a>)'; dupCount++; } else { var row = newBody.insertRow(); var cell = row.insertCell(); cell.innerHTML = record.clause.number; cell = row.insertCell(); cell.innerHTML = '<a href="#' + record.id + '">' + record.clause.titleHTML + '</a>'; previousCell = cell; previousId = record.clause.id; dupCount = 0; } }, this); this.$table.removeChild(this.$tableBody); this.$tableBody = newBody; this.$table.appendChild(this.$tableBody); } } function findParentClauseId(node) { while (node && node.nodeName !== 'EMU-CLAUSE' && node.nodeName !== 'EMU-INTRO' && node.nodeName !== 'EMU-ANNEX') { node = node.parentNode; } if (!node) return null; return node.getAttribute('id'); } function sortByClauseNumber(c1, c2) { var c1c = c1.number.split('.'); var c2c = c2.number.split('.'); for (var i = 0; i < c1c.length; i++) { if (i >= c2c.length) { return 1; } var c1 = c1c[i]; var c2 = c2c[i]; var c1cn = Number(c1); var c2cn = Number(c2); if (Number.isNaN(c1cn) && Number.isNaN(c2cn)) { if (c1 > c2) { return 1; } else if (c1 < c2) { return -1; } } else if (!Number.isNaN(c1cn) && Number.isNaN(c2cn)) { return -1; } else if (Number.isNaN(c1cn) && !Number.isNaN(c2cn)) { return 1; } else if(c1cn > c2cn) { return 1; } else if (c1cn < c2cn) { return -1; } } if (c1c.length === c2c.length) { return 0; } return -1; } document.addEventListener('DOMContentLoaded', function () { Toolbox.init(); referencePane.init(); }) var CLAUSE_NODES = ['EMU-CLAUSE', 'EMU-INTRO', 'EMU-ANNEX']; function findLocalReferences ($elem) { var name = $elem.innerHTML; var references = []; var parentClause = $elem.parentNode; while (parentClause && CLAUSE_NODES.indexOf(parentClause.nodeName) === -1) { parentClause = parentClause.parentNode; } if(!parentClause) return; var vars = parentClause.querySelectorAll('var'); for (var i = 0; i < vars.length; i++) { var $var = vars[i]; if ($var.innerHTML === name) { references.push($var); } } return references; } function toggleFindLocalReferences($elem) { var references = findLocalReferences($elem); if ($elem.classList.contains('referenced')) { references.forEach(function ($reference) { $reference.classList.remove('referenced'); }); } else { references.forEach(function ($reference) { $reference.classList.add('referenced'); }); } } function installFindLocalReferences () { document.addEventListener('click', function (e) { if (e.target.nodeName === 'VAR') { toggleFindLocalReferences(e.target); } }); } document.addEventListener('DOMContentLoaded', installFindLocalReferences); </script><style>body { display: flex; font-size: 18px; line-height: 1.5; font-family: Cambria, Palatino Linotype, Palatino, Liberation Serif, serif; padding: 0; margin: 0; color: #111; } #spec-container { padding: 0 20px; flex-grow: 1; flex-basis: 66%; box-sizing: border-box; overflow: hidden; } body.oldtoc { margin: 0 auto; } a { text-decoration: none; color: #206ca7; } a:visited { color: #206ca7; } a:hover { text-decoration: underline; color: #239dee; } code { font-weight: bold; font-family: Consolas, Monaco, monospace; white-space: pre; } pre code { font-weight: inherit; } pre code.hljs { background-color: #fff; margin: 0; padding: 0; } ol.toc { list-style: none; padding-left: 0; } ol.toc ol.toc { padding-left: 2ex; list-style: none; } var { color: #2aa198; transition: background-color 0.25s ease; cursor: pointer; } var.referenced { background-color: #ffff33; } emu-const { font-family: sans-serif; } emu-val { font-weight: bold; } emu-alg ol, emu-alg ol ol ol ol { list-style-type: decimal; } emu-alg ol ol, emu-alg ol ol ol ol ol { list-style-type: lower-alpha; } emu-alg ol ol ol, ol ol ol ol ol ol { list-style-type: lower-roman; } emu-eqn { display: block; margin-left: 4em; } emu-eqn.inline { display: inline; margin: 0; } emu-eqn div:first-child { margin-left: -2em; } emu-note { margin: 1em 0; color: #666; border-left: 5px solid #ccc; display: flex; flex-direction: row; } emu-note > span.note { flex-basis: 100px; min-width: 100px; flex-grow: 0; flex-shrink: 1; text-transform: uppercase; padding-left: 5px; } emu-note[type=editor] { border-left-color: #faa; } emu-note > div.note-contents { flex-grow: 1; flex-shrink: 1; } emu-note > div.note-contents > p:first-of-type { margin-top: 0; } emu-note > div.note-contents > p:last-of-type { margin-bottom: 0; } emu-figure { display: block; } emu-example { display: block; margin: 1em 3em; } emu-example figure figcaption { margin-top: 0.5em; text-align: left; } emu-figure figure, emu-example figure, emu-table figure { display: flex; flex-direction: column; align-items: center; } emu-production { display: block; margin-top: 1em; margin-bottom: 1em; margin-left: 5ex; } emu-grammar.inline, emu-production.inline, emu-grammar.inline emu-production emu-rhs, emu-production.inline emu-rhs, emu-grammar[collapsed] emu-production emu-rhs, emu-production[collapsed] emu-rhs { display: inline; padding-left: 1ex; margin-left: 0; } emu-grammar[collapsed] emu-production, emu-production[collapsed] { margin: 0; } emu-constraints { font-size: .75em; margin-right: 1ex; } emu-gann { margin-right: 1ex; } emu-gann emu-t:last-child, emu-gann emu-nt:last-child { margin-right: 0; } emu-geq { margin-left: 1ex; font-weight: bold; } emu-oneof { font-weight: bold; margin-left: 1ex; } emu-nt { display: inline-block; font-style: italic; white-space: nowrap; text-indent: 0; } emu-nt a, emu-nt a:visited { color: #333; } emu-rhs emu-nt { margin-right: 1ex; } emu-t { display: inline-block; font-family: monospace; font-weight: bold; white-space: nowrap; text-indent: 0; } emu-production emu-t { margin-right: 1ex; } emu-rhs { display: block; padding-left: 75px; text-indent: -25px; } emu-mods { font-size: .85em; vertical-align: sub; font-style: normal; font-weight: normal; } emu-production[collapsed] emu-mods { display: none; } emu-params, emu-opt { margin-right: 1ex; font-family: monospace; } emu-params, emu-constraints { color: #2aa198; } emu-opt { color: #b58900; } emu-gprose { font-size: 0.9em; font-family: Helvetica, Arial, sans-serif; } h1.shortname { color: #f60; font-size: 1.5em; margin: 0; } h1.version { color: #f60; font-size: 1.5em; margin: 0; } h1.title { margin-top: 0; color: #f60; } h1.first { margin-top: 0; } h1, h2, h3, h4, h5, h6 { position: relative; } h1 .secnum { text-decoration: none; margin-right: 10px; } h1 span.title { order: 2; } h1 { font-size: 2.67em; margin-top: 2em; margin-bottom: 0; line-height: 1em;} h2 { font-size: 2em; } h3 { font-size: 1.56em; } h4 { font-size: 1.25em; } h5 { font-size: 1.11em; } h6 { font-size: 1em; } h1:hover span.utils { display: block; } span.utils { font-size: 18px; line-height: 18px; display: none; position: absolute; top: 100%; left: 0; right: 0; font-weight: normal; } span.utils:before { content: "⤷"; display: inline-block; padding: 0 5px; } span.utils > * { display: inline-block; margin-right: 20px; } h1 span.utils span.anchor a, h2 span.utils span.anchor a, h3 span.utils span.anchor a, h4 span.utils span.anchor a, h5 span.utils span.anchor a, h6 span.utils span.anchor a { text-decoration: none; font-variant: small-caps; } h1 span.utils span.anchor a:hover, h2 span.utils span.anchor a:hover, h3 span.utils span.anchor a:hover, h4 span.utils span.anchor a:hover, h5 span.utils span.anchor a:hover, h6 span.utils span.anchor a:hover { color: #333; } emu-intro h1, emu-clause h1, emu-annex h1 { font-size: 2em; } emu-intro h2, emu-clause h2, emu-annex h2 { font-size: 1.56em; } emu-intro h3, emu-clause h3, emu-annex h3 { font-size: 1.25em; } emu-intro h4, emu-clause h4, emu-annex h4 { font-size: 1.11em; } emu-intro h5, emu-clause h5, emu-annex h5 { font-size: 1em; } emu-intro h6, emu-clause h6, emu-annex h6 { font-size: 0.9em; } emu-intro emu-intro h1, emu-clause emu-clause h1, emu-annex emu-annex h1 { font-size: 1.56em; } emu-intro emu-intro h2, emu-clause emu-clause h2, emu-annex emu-annex h2 { font-size: 1.25em; } emu-intro emu-intro h3, emu-clause emu-clause h3, emu-annex emu-annex h3 { font-size: 1.11em; } emu-intro emu-intro h4, emu-clause emu-clause h4, emu-annex emu-annex h4 { font-size: 1em; } emu-intro emu-intro h5, emu-clause emu-clause h5, emu-annex emu-annex h5 { font-size: 0.9em; } 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; } 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; } emu-intro emu-intro emu-intro h3, emu-clause emu-clause emu-clause h3, emu-annex emu-annex emu-annex h3 { font-size: 1em; } 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; } 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; } 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; } 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; } 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; } 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; } 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 } emu-clause, emu-intro, emu-annex { display: block; } /* Figures and tables */ figure { display: block; margin: 1em 0 3em 0; } figure object { display: block; margin: 0 auto; } figure table.real-table { margin: 0 auto; } figure figcaption { display: block; color: #555555; font-weight: bold; text-align: center; } emu-table table { margin: 0 auto; } emu-table table, table.real-table { border-collapse: collapse; } emu-table td, emu-table th, table.real-table td, table.real-table th { border: 1px solid black; padding: 0.4em; vertical-align: baseline; } emu-table th, emu-table thead td, table.real-table th { background-color: #eeeeee; } /* Note: the left content edges of table.lightweight-table >tbody >tr >td and div.display line up. */ table.lightweight-table { border-collapse: collapse; margin: 0 0 0 1.5em; } table.lightweight-table td, table.lightweight-table th { border: none; padding: 0 0.5em; vertical-align: baseline; } /* diff styles */ ins { background-color: #e0f8e0; text-decoration: none; border-bottom: 1px solid #396; } del { background-color: #fee; } ins.block, del.block, emu-production > ins, emu-production > del, emu-grammar > ins, emu-grammar > del { display: block; } emu-rhs > ins, emu-rhs > del { display: inline; } tr.ins > td > ins { border-bottom: none; } tr.ins > td { background-color: #e0f8e0; } tr.del > td { background-color: #fee; } /* Menu Styles */ #menu-toggle { font-size: 2em; position: fixed; top: 0; left: 0; width: 1.5em; height: 1.5em; z-index: 3; visibility: hidden; color: #1567a2; background-color: #fff; line-height: 1.5em; text-align: center; -webkit-touch-callout: none; -webkit-user-select: none; -khtml-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;; cursor: pointer; } #menu { display: flex; flex-direction: column; width: 33%; height: 100vh; max-width: 500px; box-sizing: border-box; background-color: #ddd; overflow: hidden; transition: opacity 0.1s linear; padding: 0 5px; position: fixed; left: 0; top: 0; border-right: 2px solid #bbb; z-index: 2; } #menu-spacer { flex-basis: 33%; max-width: 500px; flex-grow: 0; flex-shrink: 0; } #menu a { color: #1567a2; } #menu.active { display: flex; opacity: 1; z-index: 2; } #menu-pins { flex-grow: 1; display: none; } #menu-pins.active { display: block; } #menu-pins-list { margin: 0; padding: 0; counter-reset: pins-counter; } #menu-pins-list > li:before { content: counter(pins-counter); counter-increment: pins-counter; display: inline-block; width: 25px; text-align: center; border: 1px solid #bbb; padding: 2px; margin: 4px; box-sizing: border-box; line-height: 1em; background-color: #ccc; border-radius: 4px; } #menu-toc > ol { padding: 0; flex-grow: 1; } #menu-toc > ol li { padding: 0; } #menu-toc > ol , #menu-toc > ol ol { list-style-type: none; margin: 0; padding: 0; } #menu-toc > ol ol { padding-left: 0.75em; } #menu-toc li { text-overflow: ellipsis; overflow: hidden; white-space: nowrap; } #menu-toc .item-toggle { display: inline-block; transform: rotate(-45deg) translate(-5px, -5px); transition: transform 0.1s ease; text-align: center; width: 20px; color: #aab; -webkit-touch-callout: none; -webkit-user-select: none; -khtml-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;; cursor: pointer; } #menu-toc .item-toggle-none { display: inline-block; width: 20px; } #menu-toc li.active > .item-toggle { transform: rotate(45deg) translate(-5px, -5px); } #menu-toc li > ol { display: none; } #menu-toc li.active > ol { display: block; } #menu-toc li.revealed > a { background-color: #bbb; font-weight: bold; /* background-color: #222; color: #c6d8e4; */ } #menu-toc li.revealed-leaf> a { color: #206ca7; /* background-color: #222; color: #c6d8e4; */ } #menu-toc li.revealed > .item-toggle { transform: rotate(45deg) translate(-5px, -5px); } #menu-toc li.revealed > ol { display: block; } #menu-toc li > a { padding: 2px 5px; } #menu > * { margin-bottom: 5px; } .menu-pane-header { padding: 0 5px; text-transform: uppercase; background-color: #aaa; color: #335; font-weight: bold; letter-spacing: 2px; flex-grow: 0; flex-shrink: 0; font-size: 0.8em; } #menu-toc { display: flex; flex-direction: column; width: 100%; overflow: hidden; flex-grow: 1; } #menu-toc ol.toc { overflow-x: hidden; overflow-y: auto; } #menu-search { position: relative; flex-grow: 0; flex-shrink: 0; width: 100%; display: flex; flex-direction: column; max-height: 300px; } #menu-trace-list { display: none; } #menu-search-box { box-sizing: border-box; display: block; width: 100%; margin: 5px 0 0 0; font-size: 1em; padding: 2px; background-color: #bbb; border: 1px solid #999; } #menu-search-results { overflow-x: hidden; overflow-y: auto; } li.menu-search-result-clause:before { content: 'clause'; width: 40px; display: inline-block; text-align: right; padding-right: 1ex; color: #666; font-size: 75%; } li.menu-search-result-op:before { content: 'op'; width: 40px; display: inline-block; text-align: right; padding-right: 1ex; color: #666; font-size: 75%; } li.menu-search-result-prod:before { content: 'prod'; width: 40px; display: inline-block; text-align: right; padding-right: 1ex; color: #666; font-size: 75% } li.menu-search-result-term:before { content: 'term'; width: 40px; display: inline-block; text-align: right; padding-right: 1ex; color: #666; font-size: 75% } #menu-search-results ul { padding: 0 5px; margin: 0; } #menu-search-results li { white-space: nowrap; text-overflow: ellipsis; } #menu-trace-list { counter-reset: item; margin: 0 0 0 20px; padding: 0; } #menu-trace-list li { display: block; white-space: nowrap; } #menu-trace-list li .secnum:after { content: " "; } #menu-trace-list li:before { content: counter(item) " "; background-color: #222; counter-increment: item; color: #999; width: 20px; height: 20px; line-height: 20px; display: inline-block; text-align: center; margin: 2px 4px 2px 0; } @media (max-width: 1000px) { body { margin: 0; display: block; } #menu { display: none; padding-top: 3em; width: 450px; } #menu.active { position: fixed; height: 100%; left: 0; top: 0; right: 300px; } #menu-toggle { visibility: visible; } #spec-container { padding: 0 5px; } #references-pane-spacer { display: none; } } @media only screen and (max-width: 800px) { #menu { width: 100%; } h1 .secnum:empty { margin: 0; padding: 0; } } /* Toolbox */ .toolbox { position: absolute; background: #ddd; border: 1px solid #aaa; display: none; color: #eee; padding: 5px; border-radius: 3px; } .toolbox.active { display: inline-block; } .toolbox a { text-decoration: none; padding: 0 5px; } .toolbox a:hover { text-decoration: underline; } .toolbox:after, .toolbox:before { top: 100%; left: 15px; border: solid transparent; content: " "; height: 0; width: 0; position: absolute; pointer-events: none; } .toolbox:after { border-color: rgba(0, 0, 0, 0); border-top-color: #ddd; border-width: 10px; margin-left: -10px; } .toolbox:before { border-color: rgba(204, 204, 204, 0); border-top-color: #aaa; border-width: 12px; margin-left: -12px; } #references-pane-container { position: fixed; bottom: 0; left: 0; right: 0; height: 250px; display: none; background-color: #ddd; z-index: 1; } #references-pane-table-container { overflow-x: hidden; overflow-y: auto; } #references-pane-spacer { flex-basis: 33%; max-width: 500px; } #references-pane { flex-grow: 1; overflow: hidden; display: flex; flex-direction: column; } #references-pane-container.active { display: flex; } #references-pane-close:after { content: '✖'; float: right; cursor: pointer; } #references-pane table tr td:first-child { text-align: right; padding-right: 5px; } @media print { #menu-toggle { display: none; } } </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">Pins</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"> <emu-intro id="introduction"> <h1 class="first">Metadata Proposal - ECMAScript</h1> <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> <p>Proposal to add Metadata to ECMAScript.</p> </emu-intro> <emu-clause id="syntax"> <h1><span class="secnum">1</span>Syntax</h1> <emu-note><span class="note">Note</span><div class="note-contents">This section is non-normative.</div></emu-note> <pre><code class="javascript hljs"><span class="hljs-comment">// define metadata on an object or property</span> <span class="hljs-built_in">Reflect</span>.defineMetadata(metadataKey, metadataValue, target); <span class="hljs-built_in">Reflect</span>.defineMetadata(metadataKey, metadataValue, target, propertyKey); <span class="hljs-comment">// check for presence of a metadata key on the prototype chain of an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasMetadata(metadataKey, target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasMetadata(metadataKey, target, propertyKey); <span class="hljs-comment">// check for presence of an own metadata key of an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasOwnMetadata(metadataKey, target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.hasOwnMetadata(metadataKey, target, propertyKey); <span class="hljs-comment">// get metadata value of a metadata key on the prototype chain of an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadata(metadataKey, target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadata(metadataKey, target, propertyKey); <span class="hljs-comment">// get metadata value of an own metadata key of an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadata(metadataKey, target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadata(metadataKey, target, propertyKey); <span class="hljs-comment">// get all metadata keys on the prototype chain of an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadataKeys(target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getMetadataKeys(target, propertyKey); <span class="hljs-comment">// get all own metadata keys of an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadataKeys(target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.getOwnMetadataKeys(target, propertyKey); <span class="hljs-comment">// delete metadata from an object or property</span> <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.deleteMetadata(metadataKey, target); <span class="hljs-keyword">let</span> result = <span class="hljs-built_in">Reflect</span>.deleteMetadata(metadataKey, target, propertyKey); <span class="hljs-comment">// apply metadata via a decorator to a constructor</span> @<span class="hljs-built_in">Reflect</span>.metadata(metadataKey, metadataValue) <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C</span> </span>{ <span class="hljs-comment">// apply metadata via a decorator to a method (property)</span> @<span class="hljs-built_in">Reflect</span>.metadata(metadataKey, metadataValue) method() { } } <span class="hljs-comment">// Design-time type annotations</span> <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); } <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); } <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); } <span class="hljs-comment">// Decorator application</span> @ParamTypes(<span class="hljs-built_in">String</span>, <span class="hljs-built_in">Number</span>) <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C</span> </span>{ <span class="hljs-keyword">constructor</span>(text, i) { } @Type(<span class="hljs-built_in">String</span>) get name() { <span class="hljs-keyword">return</span> <span class="hljs-string">"text"</span>; } @Type(<span class="hljs-built_in">Function</span>) @ParamTypes(<span class="hljs-built_in">Number</span>, <span class="hljs-built_in">Number</span>) @ReturnType(<span class="hljs-built_in">Number</span>) add(x, y) { <span class="hljs-keyword">return</span> x + y; } } <span class="hljs-comment">// Metadata introspection</span> <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>); <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> </emu-clause> <emu-clause id="abstract-operations"> <h1><span class="secnum">2</span>Abstract Operations</h1> <emu-clause id="operations-on-objects"> <h1><span class="secnum">2.1</span>Operations on Objects</h1> <emu-clause id="getorcreatemetadatamap" aoid="GetOrCreateMetadataMap"> <h1><span class="secnum">2.1.1</span>GetOrCreateMetadataMap ( O, P, Create )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_0"><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 ? <emu-xref aoid="Invoke" id="_ref_1"><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 ? <emu-xref aoid="Invoke" id="_ref_2"><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>. </li></ol></emu-alg> </emu-clause> </emu-clause> </emu-clause> <emu-clause id="ordinary-and-exotic-objects-behaviors"> <h1><span class="secnum">3</span>Ordinary and Exotic Objects Behaviors</h1> <emu-clause id="ordinary-object-internal-methods-and-internal-slots"> <h1><span class="secnum">3.1</span>Ordinary Object Internal Methods and Internal Slots</h1> <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> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-hasmetadata"> <h1><span class="secnum">3.1.1</span>[[HasMetadata]] ( MetadataKey, P )</h1> <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> <emu-alg><ol><li>Return ? <emu-xref aoid="OrdinaryHasMetadata" id="_ref_3"><a href="#ordinaryhasmetadata">OrdinaryHasMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>). </li></ol></emu-alg> <emu-clause id="ordinaryhasmetadata" aoid="OrdinaryHasMetadata"> <h1><span class="secnum">3.1.1.1</span>OrdinaryHasMetadata ( MetadataKey, O, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_4"><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 ? <emu-xref aoid="OrdinaryHasOwnMetadata" id="_ref_5"><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>. </li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-hasownmetadata"> <h1><span class="secnum">3.1.2</span>[[HasOwnMetadata]] ( MetadataKey, P )</h1> <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> <emu-alg><ol><li>Return ? <emu-xref aoid="OrdinaryHasOwnMetadata" id="_ref_6"><a href="#ordinaryhasownmetadata">OrdinaryHasOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>). </li></ol></emu-alg> <emu-clause id="ordinaryhasownmetadata" aoid="OrdinaryHasOwnMetadata"> <h1><span class="secnum">3.1.2.1</span>OrdinaryHasOwnMetadata ( MetadataKey, O, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_7"><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 ? <emu-xref aoid="GetOrCreateMetadataMap" id="_ref_8"><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 ? <emu-xref aoid="ToBoolean" id="_ref_9"><a href="https://tc39.github.io/ecma262/#sec-toboolean">ToBoolean</a></emu-xref>(? <emu-xref aoid="Invoke" id="_ref_10"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"has"</code>, <var>MetadataKey</var>)). </li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-getmetadata"> <h1><span class="secnum">3.1.3</span>[[GetMetadata]] ( MetadataKey, P )</h1> <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> <emu-alg><ol><li>Return ? <emu-xref aoid="OrdinaryGetMetadata" id="_ref_11"><a href="#ordinarygetmetadata">OrdinaryGetMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>). </li></ol></emu-alg> <emu-clause id="ordinarygetmetadata" aoid="OrdinaryGetMetadata"> <h1><span class="secnum">3.1.3.1</span>OrdinaryGetMetadata ( MetadataKey, O, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_12"><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 ? <emu-xref aoid="OrdinaryHasOwnMetadata" id="_ref_13"><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-xref aoid="OrdinaryGetOwnMetadata" id="_ref_14"><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>. </li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-getownmetadata"> <h1><span class="secnum">3.1.4</span>[[GetOwnMetadata]] ( MetadataKey, P, ParamIndex )</h1> <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> <emu-alg><ol><li>Return ? <emu-xref aoid="OrdinaryGetOwnMetadata" id="_ref_15"><a href="#ordinarygetownmetadata">OrdinaryGetOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>O</var>, <var>P</var>). </li></ol></emu-alg> <emu-clause id="ordinarygetownmetadata" aoid="OrdinaryGetOwnMetadata"> <h1><span class="secnum">3.1.4.1</span>OrdinaryGetOwnMetadata ( MetadataKey, O, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_16"><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 ? <emu-xref aoid="GetOrCreateMetadataMap" id="_ref_17"><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 ? <emu-xref aoid="Invoke" id="_ref_18"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"get"</code>, <var>MetadataKey</var>). </li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-defineownmetadata"> <h1><span class="secnum">3.1.5</span>[[DefineOwnMetadata]] ( MetadataKey, MetadataValue, P )</h1> <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> <emu-alg><ol><li>Return ? <emu-xref aoid="OrdinaryDefineOwnMetadata" id="_ref_19"><a href="#ordinarydefineownmetadata">OrdinaryDefineOwnMetadata</a></emu-xref>(<var>MetadataKey</var>, <var>MetadataValue</var>, <var>O</var>, <var>P</var>) </li></ol></emu-alg> <emu-clause id="ordinarydefineownmetadata" aoid="OrdinaryDefineOwnMetadata"> <h1><span class="secnum">3.1.5.1</span>OrdinaryDefineOwnMetadata ( MetadataKey, MetadataValue, O, P )</h1> <p>When the abstract operation <emu-xref aoid="OrdinaryDefineOwnProperty" id="_ref_20"><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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_21"><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 ? <emu-xref aoid="GetOrCreateMetadataMap" id="_ref_22"><a href="#getorcreatemetadatamap">GetOrCreateMetadataMap</a></emu-xref>(<var>O</var>, <var>P</var>, <emu-val>true</emu-val>).</li><li>Return ? <emu-xref aoid="Invoke" id="_ref_23"><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>). </li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-metadatakeys"> <h1><span class="secnum">3.1.6</span>[[MetadataKeys]] ( P )</h1> <p>When the [[MetadataKeys]] internal method of <var>O</var> is called with property key <var>P</var> the following steps are taken:</p> <emu-alg><ol><li>Return ? <emu-xref aoid="OrdinaryMetadataKeys" id="_ref_24"><a href="#ordinarymetadatakeys">OrdinaryMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>). </li></ol></emu-alg> <emu-clause id="ordinarymetadatakeys" aoid="OrdinaryMetadataKeys"> <h1><span class="secnum">3.1.6.1</span>OrdinaryMetadataKeys ( O, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_25"><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 ? <emu-xref aoid="OrdinaryOwnMetadataKeys" id="_ref_26"><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> = ? <emu-xref aoid="Get" id="_ref_27"><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> = ? <emu-xref aoid="Get" id="_ref_28"><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 ? <emu-xref aoid="ArrayCreate" id="_ref_29"><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 ? <emu-xref aoid="Invoke" id="_ref_30"><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 ! <emu-xref aoid="ToString" id="_ref_31"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Perform ? <emu-xref aoid="Invoke" id="_ref_32"><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" id="_ref_33"><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 ? <emu-xref aoid="Invoke" id="_ref_34"><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 ! <emu-xref aoid="ToString" id="_ref_35"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Perform ? <emu-xref aoid="Invoke" id="_ref_36"><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" id="_ref_37"><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 ? <emu-xref aoid="Set" id="_ref_38"><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>. </li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-ownmetadatakeys"> <h1><span class="secnum">3.1.7</span>[[OwnMetadataKeys]] ( P )</h1> <p>When the [[OwnMetadataKeys]] internal method of <var>O</var> is called with property key <var>P</var> the following steps are taken:</p> <emu-alg><ol><li>Return <emu-xref aoid="OrdinaryOwnMetadataKeys" id="_ref_39"><a href="#ordinaryownmetadatakeys">OrdinaryOwnMetadataKeys</a></emu-xref>(<var>O</var>, <var>P</var>). </li></ol></emu-alg> <emu-clause id="ordinaryownmetadatakeys" aoid="OrdinaryOwnMetadataKeys"> <h1><span class="secnum">3.1.7.1</span>OrdinaryOwnMetadataKeys ( O, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_40"><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 ? <emu-xref aoid="ArrayCreate" id="_ref_41"><a href="https://tc39.github.io/ecma262/#sec-arraycreate">ArrayCreate</a></emu-xref>(0).</li><li>Let <var>metadataMap</var> be ? <emu-xref aoid="GetOrCreateMetadataMap" id="_ref_42"><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 ? <emu-xref aoid="Invoke" id="_ref_43"><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 ? <emu-xref aoid="GetIterator" id="_ref_44"><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 ! <emu-xref aoid="ToString" id="_ref_45"><a href="https://tc39.github.io/ecma262/#sec-tostring">ToString</a></emu-xref>(<var>k</var>).</li><li>Let <var>next</var> be ? <emu-xref aoid="IteratorStep" id="_ref_46"><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 ? <emu-xref aoid="Set" id="_ref_47"><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 ? <emu-xref aoid="IteratorValue" id="_ref_48"><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" id="_ref_49"><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 ? <emu-xref aoid="IteratorClose" id="_ref_50"><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>. </li></ol></li></ol></emu-alg> </emu-clause> </emu-clause> <emu-clause id="ordinary-object-internal-methods-and-internal-slots-deletemetadata"> <h1><span class="secnum">3.1.8</span>[[DeleteMetadata]]( MetadataKey, P )</h1> <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> <emu-alg><ol><li>Assert: <var>P</var> is <emu-val>undefined</emu-val> or <emu-xref aoid="IsPropertyKey" id="_ref_51"><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 ? <emu-xref aoid="GetOrCreateMetadataMap" id="_ref_52"><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 ? <emu-xref aoid="Invoke" id="_ref_53"><a href="https://tc39.github.io/ecma262/#sec-invoke">Invoke</a></emu-xref>(<var>metadataMap</var>, <code>"delete"</code>, <var>MetadataKey</var>). </li></ol></emu-alg> </emu-clause> </emu-clause> </emu-clause> <emu-clause id="reflection"> <h1><span class="secnum">4</span>Reflection</h1> <emu-clause id="reflect"> <h1><span class="secnum">4.1</span>The Reflect Object</h1> <p>This section contains amendments to the Reflect object.</p> <emu-clause id="reflect-metadatadecoratorfunctions"> <h1><span class="secnum">4.1.1</span>Metadata Decorator Functions</h1> <p>A metadata decorator function is an anonymous built-in function that has [[MetadataKey]] and [[MetadataValue]] internal slots.</p> <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> <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" id="_ref_54"><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" id="_ref_55"><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>. </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.metadata"> <h1><span class="secnum">4.1.2</span>Reflect.metadata ( metadataKey, metadataValue )</h1> <p>When the <code>metadata</code> function is called with arguments <var>metadataKey</var> and <var>metadataValue</var>, the following steps are taken:</p> <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>. </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.definemetadata"> <h1><span class="secnum">4.1.3</span>Reflect.defineMetadata ( metadataKey, metadataValue, target [, propertyKey] )</h1> <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> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_56"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.hasmetadata"> <h1><span class="secnum">4.1.4</span>Reflect.hasMetadata ( metadataKey, target [, propertyKey] )</h1> <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> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_57"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.hasownmetadata"> <h1><span class="secnum">4.1.5</span>Reflect.hasOwnMetadata ( metadataKey, target [, propertyKey] )</h1> <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> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_58"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.getmetadata"> <h1><span class="secnum">4.1.6</span>Reflect.getMetadata ( metadataKey, target [, propertyKey] )</h1> <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> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_59"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.getownmetadata"> <h1><span class="secnum">4.1.7</span>Reflect.getOwnMetadata ( metadataKey, target [, propertyKey] )</h1> <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> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_60"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.getmetadatakeys"> <h1><span class="secnum">4.1.8</span>Reflect.getMetadataKeys ( target [, propertyKey] )</h1> <p>When the <code>getMetadataKeys</code> function is called with arguments <var>target</var> and <var>propertyKey</var>, the following steps are taken:</p> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_61"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.getownmetadatakeys"> <h1><span class="secnum">4.1.9</span>Reflect.getOwnMetadataKeys ( target [, propertyKey] )</h1> <p>When the <code>getOwnMetadataKeys</code> function is called with arguments <var>target</var> and <var>propertyKey</var>, the following steps are taken:</p> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_62"><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>). </li></ol></emu-alg> </emu-clause> <emu-clause id="reflect.deletemetadata"> <h1><span class="secnum">4.1.10</span>Reflect.deleteMetadata ( metadataKey, target [, propertyKey] )</h1> <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> <emu-alg><ol><li>If <emu-xref aoid="Type" id="_ref_63"><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>). </li></ol></emu-alg> </emu-clause> </emu-clause> </emu-clause></div></body>