var $ = require('../internals/export'); var hiddenKeys = require('../internals/hidden-keys'); var isObject = require('../internals/is-object'); var has = require('../internals/has'); var defineProperty = require('../internals/object-define-property').f; var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names'); var getOwnPropertyNamesExternalModule = require('../internals/object-get-own-property-names-external'); var uid = require('../internals/uid'); var FREEZING = require('../internals/freezing'); var REQUIRED = false; var METADATA = uid('meta'); var id = 0; // eslint-disable-next-line es/no-object-isextensible -- safe var isExtensible = Object.isExtensible || function () { return true; }; var setMetadata = function (it) { defineProperty(it, METADATA, { value: { objectID: 'O' + id++, // object ID weakData: {} // weak collections IDs } }); }; var fastKey = function (it, create) { // return a primitive with prefix if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it; if (!has(it, METADATA)) { // can't set metadata to uncaught frozen object if (!isExtensible(it)) return 'F'; // not necessary to add metadata if (!create) return 'E'; // add missing metadata setMetadata(it); // return object ID } return it[METADATA].objectID; }; var getWeakData = function (it, create) { if (!has(it, METADATA)) { // can't set metadata to uncaught frozen object if (!isExtensible(it)) return true; // not necessary to add metadata if (!create) return false; // add missing metadata setMetadata(it); // return the store of weak collections IDs } return it[METADATA].weakData; }; // add metadata on freeze-family methods calling var onFreeze = function (it) { if (FREEZING && REQUIRED && isExtensible(it) && !has(it, METADATA)) setMetadata(it); return it; }; var enable = function () { meta.enable = function () { /* empty */ }; REQUIRED = true; var getOwnPropertyNames = getOwnPropertyNamesModule.f; var splice = [].splice; var test = {}; test[METADATA] = 1; // prevent exposing of metadata key if (getOwnPropertyNames(test).length) { getOwnPropertyNamesModule.f = function (it) { var result = getOwnPropertyNames(it); for (var i = 0, length = result.length; i < length; i++) { if (result[i] === METADATA) { splice.call(result, i, 1); break; } } return result; }; $({ target: 'Object', stat: true, forced: true }, { getOwnPropertyNames: getOwnPropertyNamesExternalModule.f }); } }; var meta = module.exports = { enable: enable, fastKey: fastKey, getWeakData: getWeakData, onFreeze: onFreeze }; hiddenKeys[METADATA] = true;