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Add ES2019 Object.fromEntries function (#30934)
* add ES2019 Object.fromEntries function * add some comments * apply suggested changes * add readonly and general any
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‎src/compiler/commandLineParser.ts

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@@ -45,6 +45,7 @@ namespace ts {
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["es2018.promise", "lib.es2018.promise.d.ts"],
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["es2018.regexp", "lib.es2018.regexp.d.ts"],
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["es2019.array", "lib.es2019.array.d.ts"],
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["es2019.object", "lib.es2019.object.d.ts"],
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["es2019.string", "lib.es2019.string.d.ts"],
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["es2019.symbol", "lib.es2019.symbol.d.ts"],
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["es2020.string", "lib.es2020.string.d.ts"],

‎src/lib/es2019.d.ts

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@@ -1,4 +1,5 @@
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/// <reference lib="es2018" />
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/// <reference lib="es2019.array" />
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/// <reference lib="es2019.object" />
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/// <reference lib="es2019.string" />
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/// <reference lib="es2019.symbol" />

‎src/lib/es2019.object.d.ts

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/// <reference lib="es2015.iterable" />
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interface ObjectConstructor {
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/**
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* Returns an object created by key-value entries for properties and methods
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* @param entries An iterable object that contains key-value entries for properties and methods.
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*/
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fromEntries<T = any>(entries: Iterable<readonly [PropertyKey, T]>): { [k in PropertyKey]: T };
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/**
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* Returns an object created by key-value entries for properties and methods
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* @param entries An iterable object that contains key-value entries for properties and methods.
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*/
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fromEntries(entries: Iterable<readonly any[]>): any;
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}

‎src/lib/libs.json

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"es2018.promise",
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"es2018.intl",
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"es2019.array",
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"es2019.object",
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"es2019.string",
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"es2019.symbol",
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"es2020.string",

‎src/testRunner/unittests/config/commandLineParsing.ts

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@@ -57,7 +57,7 @@ namespace ts {
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assertParseResult(["--lib", "es5,invalidOption", "0.ts"],
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{
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errors: [{
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messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.string', 'es2019.symbol', 'es2020.string', 'es2020.symbol.wellknown', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
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messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2020.string', 'es2020.symbol.wellknown', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
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category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
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code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
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file: undefined,
@@ -259,7 +259,7 @@ namespace ts {
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assertParseResult(["--lib", "es5,", "es7", "0.ts"],
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{
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errors: [{
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messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.string', 'es2019.symbol', 'es2020.string', 'es2020.symbol.wellknown', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
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messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2020.string', 'es2020.symbol.wellknown', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
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category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
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code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
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file: undefined,
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assertParseResult(["--lib", "es5, ", "es7", "0.ts"],
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{
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errors: [{
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messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.string', 'es2019.symbol', 'es2020.string', 'es2020.symbol.wellknown', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
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messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'es2020', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.object', 'es2019.string', 'es2019.symbol', 'es2020.string', 'es2020.symbol.wellknown', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
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category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
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code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
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file: undefined,

‎tests/baselines/reference/objectFromEntries.js

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//// [objectFromEntries.ts]
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const o = Object.fromEntries([['a', 1], ['b', 2], ['c', 3]]);
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const o2 = Object.fromEntries(new URLSearchParams());
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const o3 = Object.fromEntries(new Map([[Symbol("key"), "value"]]));
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const frozenArray = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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const o4 = Object.fromEntries(frozenArray);
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const frozenArray2: readonly [string, number][] = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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const o5 = Object.fromEntries(frozenArray2);
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//// [objectFromEntries.js]
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const o = Object.fromEntries([['a', 1], ['b', 2], ['c', 3]]);
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const o2 = Object.fromEntries(new URLSearchParams());
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const o3 = Object.fromEntries(new Map([[Symbol("key"), "value"]]));
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const frozenArray = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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const o4 = Object.fromEntries(frozenArray);
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const frozenArray2 = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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const o5 = Object.fromEntries(frozenArray2);

‎tests/baselines/reference/objectFromEntries.symbols

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=== tests/cases/compiler/objectFromEntries.ts ===
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const o = Object.fromEntries([['a', 1], ['b', 2], ['c', 3]]);
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>o : Symbol(o, Decl(objectFromEntries.ts, 0, 5))
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>Object.fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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const o2 = Object.fromEntries(new URLSearchParams());
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>o2 : Symbol(o2, Decl(objectFromEntries.ts, 1, 5))
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>Object.fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>URLSearchParams : Symbol(URLSearchParams, Decl(lib.dom.d.ts, --, --), Decl(lib.dom.d.ts, --, --), Decl(lib.dom.d.ts, --, --), Decl(lib.dom.iterable.d.ts, --, --))
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const o3 = Object.fromEntries(new Map([[Symbol("key"), "value"]]));
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>o3 : Symbol(o3, Decl(objectFromEntries.ts, 2, 5))
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>Object.fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>Map : Symbol(Map, Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.collection.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
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>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
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const frozenArray = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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>frozenArray : Symbol(frozenArray, Decl(objectFromEntries.ts, 4, 5))
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>Object.freeze : Symbol(ObjectConstructor.freeze, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>freeze : Symbol(ObjectConstructor.freeze, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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const o4 = Object.fromEntries(frozenArray);
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>o4 : Symbol(o4, Decl(objectFromEntries.ts, 5, 5))
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>Object.fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>frozenArray : Symbol(frozenArray, Decl(objectFromEntries.ts, 4, 5))
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const frozenArray2: readonly [string, number][] = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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>frozenArray2 : Symbol(frozenArray2, Decl(objectFromEntries.ts, 7, 5))
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>Object.freeze : Symbol(ObjectConstructor.freeze, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>freeze : Symbol(ObjectConstructor.freeze, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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const o5 = Object.fromEntries(frozenArray2);
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>o5 : Symbol(o5, Decl(objectFromEntries.ts, 8, 5))
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>Object.fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>Object : Symbol(Object, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
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>fromEntries : Symbol(ObjectConstructor.fromEntries, Decl(lib.es2019.object.d.ts, --, --), Decl(lib.es2019.object.d.ts, --, --))
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>frozenArray2 : Symbol(frozenArray2, Decl(objectFromEntries.ts, 7, 5))
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‎tests/baselines/reference/objectFromEntries.types

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=== tests/cases/compiler/objectFromEntries.ts ===
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const o = Object.fromEntries([['a', 1], ['b', 2], ['c', 3]]);
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>o : { [x: string]: number; [x: number]: number; }
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>Object.fromEntries([['a', 1], ['b', 2], ['c', 3]]) : { [x: string]: number; [x: number]: number; }
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>Object.fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>Object : ObjectConstructor
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>fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>[['a', 1], ['b', 2], ['c', 3]] : [string, number][]
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>['a', 1] : [string, number]
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>'a' : "a"
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>1 : 1
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>['b', 2] : [string, number]
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>'b' : "b"
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>2 : 2
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>['c', 3] : [string, number]
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>'c' : "c"
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>3 : 3
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const o2 = Object.fromEntries(new URLSearchParams());
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>o2 : { [x: string]: string; [x: number]: string; }
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>Object.fromEntries(new URLSearchParams()) : { [x: string]: string; [x: number]: string; }
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>Object.fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>Object : ObjectConstructor
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>fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>new URLSearchParams() : URLSearchParams
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>URLSearchParams : { new (init?: string | URLSearchParams | string[][] | Record<string, string>): URLSearchParams; prototype: URLSearchParams; }
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const o3 = Object.fromEntries(new Map([[Symbol("key"), "value"]]));
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>o3 : { [x: string]: string; [x: number]: string; }
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>Object.fromEntries(new Map([[Symbol("key"), "value"]])) : { [x: string]: string; [x: number]: string; }
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>Object.fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>Object : ObjectConstructor
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>fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>new Map([[Symbol("key"), "value"]]) : Map<symbol, string>
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>Map : MapConstructor
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>[[Symbol("key"), "value"]] : [symbol, string][]
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>[Symbol("key"), "value"] : [symbol, string]
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>Symbol("key") : symbol
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>Symbol : SymbolConstructor
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>"key" : "key"
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>"value" : "value"
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const frozenArray = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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>frozenArray : readonly (string | number)[][]
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>Object.freeze([['a', 1], ['b', 2], ['c', 3]]) : readonly (string | number)[][]
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>Object.freeze : { <T>(a: T[]): readonly T[]; <T extends Function>(f: T): T; <T>(o: T): Readonly<T>; }
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>Object : ObjectConstructor
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>freeze : { <T>(a: T[]): readonly T[]; <T extends Function>(f: T): T; <T>(o: T): Readonly<T>; }
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>[['a', 1], ['b', 2], ['c', 3]] : (string | number)[][]
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>['a', 1] : (string | number)[]
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>'a' : "a"
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>1 : 1
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>['b', 2] : (string | number)[]
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>'b' : "b"
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>2 : 2
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>['c', 3] : (string | number)[]
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>'c' : "c"
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>3 : 3
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const o4 = Object.fromEntries(frozenArray);
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>o4 : any
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>Object.fromEntries(frozenArray) : any
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>Object.fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>Object : ObjectConstructor
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>fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>frozenArray : readonly (string | number)[][]
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const frozenArray2: readonly [string, number][] = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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>frozenArray2 : readonly [string, number][]
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>Object.freeze([['a', 1], ['b', 2], ['c', 3]]) : readonly [string, number][]
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>Object.freeze : { <T>(a: T[]): readonly T[]; <T extends Function>(f: T): T; <T>(o: T): Readonly<T>; }
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>Object : ObjectConstructor
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>freeze : { <T>(a: T[]): readonly T[]; <T extends Function>(f: T): T; <T>(o: T): Readonly<T>; }
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>[['a', 1], ['b', 2], ['c', 3]] : [string, number][]
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>['a', 1] : [string, number]
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>'a' : "a"
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>1 : 1
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>['b', 2] : [string, number]
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>'b' : "b"
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>2 : 2
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>['c', 3] : [string, number]
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>'c' : "c"
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>3 : 3
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const o5 = Object.fromEntries(frozenArray2);
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>o5 : { [x: string]: number; [x: number]: number; }
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>Object.fromEntries(frozenArray2) : { [x: string]: number; [x: number]: number; }
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>Object.fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>Object : ObjectConstructor
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>fromEntries : { <T = any>(entries: Iterable<readonly [string | number | symbol, T]>): { [x: string]: T; [x: number]: T; }; (entries: Iterable<readonly any[]>): any; }
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>frozenArray2 : readonly [string, number][]
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‎tests/cases/compiler/objectFromEntries.ts

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// @target: es2019
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const o = Object.fromEntries([['a', 1], ['b', 2], ['c', 3]]);
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const o2 = Object.fromEntries(new URLSearchParams());
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const o3 = Object.fromEntries(new Map([[Symbol("key"), "value"]]));
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const frozenArray = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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const o4 = Object.fromEntries(frozenArray);
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const frozenArray2: readonly [string, number][] = Object.freeze([['a', 1], ['b', 2], ['c', 3]]);
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const o5 = Object.fromEntries(frozenArray2);

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