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Default target to "latest standard", deprecate ES5 #63067

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40ca9d5
dtsBundler target
jakebailey Jan 28, 2026
3ee4c3f
Force ES5 in convertToAsyncFunction tests
jakebailey Jan 29, 2026
5de2add
Fix up tests which require a stable target
jakebailey Jan 30, 2026
882eef4
Explicitly set target for codefix tsconfig tests
jakebailey Jan 30, 2026
6a38824
Silence deprecations in transpile and evalulator unit tests
jakebailey Jan 30, 2026
f6f9faf
Update other unit tests to prevent deprecation errors
jakebailey Jan 30, 2026
ea264aa
Add ScriptTarget.LatestStandard
jakebailey Jan 28, 2026
b053a30
Default to LatestStandard
jakebailey Jan 28, 2026
9a0396c
Update baselines
jakebailey Jan 30, 2026
f40b25c
Deprecate ES5
jakebailey Jan 30, 2026
212085d
Accept obviously correct baselines
jakebailey Jan 30, 2026
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2 changes: 1 addition & 1 deletion scripts/dtsBundler.mjs
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Expand Up @@ -73,7 +73,7 @@ function getDeclarationStatement(node) {
return undefined;
}

const program = ts.createProgram([entrypoint], { target: ts.ScriptTarget.ES5 });
const program = ts.createProgram([entrypoint], { target: ts.ScriptTarget.ES2015 });

const typeChecker = program.getTypeChecker();

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4 changes: 2 additions & 2 deletions src/compiler/commandLineParser.ts
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Expand Up @@ -579,12 +579,12 @@ export const targetOptionDeclaration: CommandLineOptionOfCustomType = {
affectsModuleResolution: true,
affectsEmit: true,
affectsBuildInfo: true,
deprecatedKeys: new Set(["es3"]),
deprecatedKeys: new Set(["es3", "es5"]),
paramType: Diagnostics.VERSION,
showInSimplifiedHelpView: true,
category: Diagnostics.Language_and_Environment,
description: Diagnostics.Set_the_JavaScript_language_version_for_emitted_JavaScript_and_include_compatible_library_declarations,
defaultValueDescription: ScriptTarget.ES5,
defaultValueDescription: ScriptTarget.LatestStandard,
};

/** @internal */
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2 changes: 1 addition & 1 deletion src/compiler/factory/nodeFactory.ts
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Expand Up @@ -6052,7 +6052,7 @@ export function createNodeFactory(flags: NodeFactoryFlags, baseFactory: BaseNode
node.path = "" as Path;
node.resolvedPath = "" as Path;
node.originalFileName = "";
node.languageVersion = ScriptTarget.ES5;
node.languageVersion = ScriptTarget.LatestStandard;
node.languageVariant = 0;
node.scriptKind = 0;
node.isDeclarationFile = false;
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3 changes: 3 additions & 0 deletions src/compiler/program.ts
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Expand Up @@ -4526,6 +4526,9 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
});

checkDeprecations("6.0", "7.0", createDiagnostic, createDeprecatedDiagnostic => {
if (options.target === ScriptTarget.ES5) {
createDeprecatedDiagnostic("target", "ES5");
}
if (options.moduleResolution === ModuleResolutionKind.Node10) {
createDeprecatedDiagnostic("moduleResolution", "node10", /*useInstead*/ undefined, Diagnostics.Visit_https_Colon_Slash_Slashaka_ms_Slashts6_for_migration_information);
}
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2 changes: 2 additions & 0 deletions src/compiler/types.ts
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Expand Up @@ -7659,6 +7659,7 @@ export const enum ScriptKind {
export const enum ScriptTarget {
/** @deprecated */
ES3 = 0,
/** @deprecated */
ES5 = 1,
ES2015 = 2,
ES2016 = 3,
Expand All @@ -7673,6 +7674,7 @@ export const enum ScriptTarget {
ESNext = 99,
JSON = 100,
Latest = ESNext,
LatestStandard = ES2024,
}

export const enum LanguageVariant {
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9 changes: 2 additions & 7 deletions src/compiler/utilities.ts
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Expand Up @@ -8991,15 +8991,10 @@ const _computedOptions = createComputedCompilerOptions({
},
},
target: {
dependencies: ["module"],
dependencies: [],
computeValue: compilerOptions => {
const target = compilerOptions.target === ScriptTarget.ES3 ? undefined : compilerOptions.target;
return target ??
((compilerOptions.module === ModuleKind.Node16 && ScriptTarget.ES2022) ||
(compilerOptions.module === ModuleKind.Node18 && ScriptTarget.ES2022) ||
(compilerOptions.module === ModuleKind.Node20 && ScriptTarget.ES2023) ||
(compilerOptions.module === ModuleKind.NodeNext && ScriptTarget.ESNext) ||
ScriptTarget.ES5);
return target ?? ScriptTarget.LatestStandard;
},
},
module: {
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1 change: 1 addition & 0 deletions src/harness/evaluatorImpl.ts
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Expand Up @@ -41,6 +41,7 @@ export function evaluateTypeScript(source: string | { files: vfs.FileSet; rootFi
module: ts.ModuleKind.CommonJS,
strict: false,
lib: ["lib.esnext.d.ts", "lib.dom.d.ts"],
ignoreDeprecations: "6.0",
...options,
};
const host = new fakes.CompilerHost(fs, compilerOptions);
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2 changes: 2 additions & 0 deletions src/server/protocol.ts
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Expand Up @@ -3284,6 +3284,7 @@ export const enum NewLineKind {
export const enum ScriptTarget {
/** @deprecated */
ES3 = "es3",
/** @deprecated */
ES5 = "es5",
ES6 = "es6",
ES2015 = "es2015",
Expand All @@ -3299,6 +3300,7 @@ export const enum ScriptTarget {
ESNext = "esnext",
JSON = "json",
Latest = ESNext,
LatestStandard = ES2024,
}

{
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2 changes: 1 addition & 1 deletion src/services/preProcess.ts
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Expand Up @@ -15,7 +15,7 @@ import {

export function preProcessFile(sourceText: string, readImportFiles = true, detectJavaScriptImports = false): PreProcessedFileInfo {
const pragmaContext: PragmaContext = {
languageVersion: ScriptTarget.ES5, // controls whether the token scanner considers unicode identifiers or not - shouldn't matter, since we're only using it for trivia
languageVersion: ScriptTarget.LatestStandard, // controls whether the token scanner considers unicode identifiers or not - shouldn't matter, since we're only using it for trivia
pragmas: undefined,
checkJsDirective: undefined,
referencedFiles: [],
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3 changes: 1 addition & 2 deletions src/services/services.ts
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Expand Up @@ -1382,9 +1382,8 @@ export function displayPartsToString(displayParts: SymbolDisplayPart[] | undefin
}

export function getDefaultCompilerOptions(): CompilerOptions {
// Always default to "ScriptTarget.ES5" for the language service
return {
target: ScriptTarget.ES5,
target: ScriptTarget.LatestStandard,
jsx: JsxEmit.Preserve,
};
}
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2 changes: 1 addition & 1 deletion src/testRunner/unittests/helpers/contents.ts
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Expand Up @@ -32,5 +32,5 @@ interface Symbol {
`;

export function getProjectConfigWithNodeNext(withNodeNext: boolean | undefined): object | undefined {
return withNodeNext ? { module: "nodenext", target: "es5" } : undefined;
return withNodeNext ? { module: "nodenext", target: "es2015" } : undefined;
}
2 changes: 1 addition & 1 deletion src/testRunner/unittests/helpers/demoProjectReferences.ts
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Expand Up @@ -92,7 +92,7 @@ export function getSysForDemoProjectReferences(): TestServerHost {
"/user/username/projects/demo/tsconfig-base.json": jsonToReadableText({
compilerOptions: {
declaration: true,
target: "es5",
target: "es2015",
module: "commonjs",
strict: true,
noUnusedLocals: true,
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1 change: 1 addition & 0 deletions src/testRunner/unittests/services/convertToAsyncFunction.ts
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Expand Up @@ -414,6 +414,7 @@ function testConvertToAsyncFunction(it: Mocha.PendingTestFunction, caption: stri
}
const host = TestServerHost.createServerHost(files);
const projectService = new TestProjectService(host);
projectService.setCompilerOptionsForInferredProjects({ target: ts.server.protocol.ScriptTarget.ES5 });
projectService.openClientFile(file.path);
return ts.first(projectService.inferredProjects).getLanguageService();
}
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2 changes: 2 additions & 0 deletions src/testRunner/unittests/services/transpile.ts
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Expand Up @@ -21,6 +21,7 @@ describe("unittests:: services:: Transpile", () => {
}
if (transpileOptions.compilerOptions.target === undefined) {
transpileOptions.compilerOptions.target = ts.ScriptTarget.ES5;
transpileOptions.compilerOptions.ignoreDeprecations = "6.0";
}

if (transpileOptions.compilerOptions.newLine === undefined) {
Expand Down Expand Up @@ -204,6 +205,7 @@ var x = 0;`,
emitDecoratorMetadata: true,
experimentalDecorators: true,
target: ts.ScriptTarget.ES5,
ignoreDeprecations: "6.0",
},
},
testVerbatimModuleSyntax: true,
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2 changes: 1 addition & 1 deletion src/testRunner/unittests/tsbuild/emitDeclarationOnly.ts
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Expand Up @@ -35,7 +35,7 @@ describe("unittests:: tsbuild:: on project with emitDeclarationOnly:: set to tru
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
incremental: true,
target: "es5",
target: "es2015",
module: "commonjs",
declaration: true,
declarationMap: true,
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2 changes: 1 addition & 1 deletion src/testRunner/unittests/tsbuild/inferredTypeFromTransitiveModule.ts
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Expand Up @@ -50,7 +50,7 @@ describe("unittests:: tsbuild:: inferredTypeFromTransitiveModule::", () => {
`,
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
declaration: true,
outDir: "obj",
incremental: true,
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2 changes: 1 addition & 1 deletion src/testRunner/unittests/tsbuild/resolveJsonModule.ts
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Expand Up @@ -178,7 +178,7 @@ describe("unittests:: tsbuild:: with resolveJsonModule:: option on project impor
}),
"/home/src/workspaces/solution/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
module: "commonjs",
rootDir: "./",
composite: true,
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14 changes: 12 additions & 2 deletions src/testRunner/unittests/tsbuild/sample.ts
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@@ -1,5 +1,6 @@
import { Baseline } from "../../_namespaces/Harness.js";
import * as ts from "../../_namespaces/ts.js";
import { dedent } from "../../_namespaces/Utils.js";
import { jsonToReadableText } from "../helpers.js";
import {
fakeTsVersion,
Expand Down Expand Up @@ -241,7 +242,7 @@ describe("unittests:: tsbuild:: on 'sample1' project", () => {
sys: getSysForSampleProjectReferences,
commandLineArgs: ["--b", "tests", "--verbose"],
modifySystem: sys => {
sys.writeFile("tests/tsconfig.base.json", jsonToReadableText({ compilerOptions: { target: "es5" } }));
sys.writeFile("tests/tsconfig.base.json", jsonToReadableText({ compilerOptions: { target: "es2015" } }));
sys.replaceFileText("tests/tsconfig.json", `"references": [`, `"extends": "./tsconfig.base.json", "references": [`);
},
edits: [{
Expand Down Expand Up @@ -510,6 +511,15 @@ class someClass2 { }`,
libFile.path,
`/// <reference lib="esnext" />`,
);
sys.writeFile(
"core/index.ts",
dedent`
export const someString: string = "HELLO WORLD";
export function leftPad(s: string, n: number) { return s + n; }
export function multiply(a: number, b: number) { return a * b; }
export function exponentiate(a: number, b: number) { return a ** b; }
`,
);
sys.writeFile(
"core/tsconfig.json",
jsonToReadableText({
Expand All @@ -524,7 +534,7 @@ class someClass2 { }`,
},
edits: [{
caption: "incremental-declaration-changes",
edit: sys => sys.replaceFileText("core/tsconfig.json", "esnext", "es5"),
edit: sys => sys.replaceFileText("core/tsconfig.json", "esnext", "es2015"),
}],
});

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8 changes: 4 additions & 4 deletions src/testRunner/unittests/tsc/composite.ts
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Expand Up @@ -13,7 +13,7 @@ describe("unittests:: tsc:: composite::", () => {
"/home/src/workspaces/project/src/main.ts": "export const x = 10;",
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
module: "commonjs",
composite: true,
},
Expand All @@ -33,7 +33,7 @@ describe("unittests:: tsc:: composite::", () => {
"/home/src/workspaces/project/src/main.ts": "export const x = 10;",
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
module: "commonjs",
composite: true,
},
Expand All @@ -53,7 +53,7 @@ describe("unittests:: tsc:: composite::", () => {
"/home/src/workspaces/project/src/main.ts": "export const x = 10;",
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
module: "commonjs",
composite: true,
tsBuildInfoFile: "tsconfig.json.tsbuildinfo",
Expand All @@ -74,7 +74,7 @@ describe("unittests:: tsc:: composite::", () => {
"/home/src/workspaces/project/src/main.ts": "export const x = 10;",
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
module: "commonjs",
composite: true,
tsBuildInfoFile: "tsconfig.json.tsbuildinfo",
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4 changes: 2 additions & 2 deletions src/testRunner/unittests/tsc/declarationEmit.ts
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Expand Up @@ -55,7 +55,7 @@ describe("unittests:: tsc:: declarationEmit::", () => {
function pluginOneConfig() {
return jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
declaration: true,
traceResolution: true,
},
Expand Down Expand Up @@ -236,7 +236,7 @@ ${pluginOneAction()}`,
compilerOptions: {
outDir: "dist",
rootDir: "src",
target: "es5",
target: "es2015",
module: "commonjs",
strict: true,
esModuleInterop: true,
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2 changes: 1 addition & 1 deletion src/testRunner/unittests/tsc/incremental.ts
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Expand Up @@ -23,7 +23,7 @@ describe("unittests:: tsc:: incremental::", () => {
"/home/src/workspaces/project/src/main.ts": "export const x = 10;",
"/home/src/workspaces/project/tsconfig.json": jsonToReadableText({
compilerOptions: {
target: "es5",
target: "es2015",
module: "commonjs",
},
include: [
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7 changes: 4 additions & 3 deletions src/testRunner/unittests/tscWatch/incremental.ts
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Expand Up @@ -157,7 +157,7 @@ describe("unittests:: tscWatch:: incremental:: emit file --incremental", () => {
{ currentDirectory: project },
);
const reportDiagnostic = ts.createDiagnosticReporter(system);
const parsedConfig = ts.parseConfigFileWithSystem("tsconfig.json", {}, /*extendedConfigCache*/ undefined, /*watchOptionsToExtend*/ undefined, system, reportDiagnostic)!;
const parsedConfig = ts.parseConfigFileWithSystem("tsconfig.json", { target: ts.ScriptTarget.ES5, module: ts.ModuleKind.AMD }, /*extendedConfigCache*/ undefined, /*watchOptionsToExtend*/ undefined, system, reportDiagnostic)!;
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@DanielRosenwasser DanielRosenwasser Jan 31, 2026

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I see you're still using ES5 here - are you just doing this to avoid churning baselines?

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@jakebailey jakebailey Jan 31, 2026

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Ryan asked me about this one too. Yes, this is to avoid churning baselines.

ts.performIncrementalCompilation({
rootNames: parsedConfig.fileNames,
options: parsedConfig.options,
Expand All @@ -167,7 +167,7 @@ describe("unittests:: tscWatch:: incremental:: emit file --incremental", () => {
system,
});

const command = ts.parseConfigFileWithSystem("tsconfig.json", {}, /*extendedConfigCache*/ undefined, /*watchOptionsToExtend*/ undefined, system, ts.noop)!;
const command = ts.parseConfigFileWithSystem("tsconfig.json", { target: ts.ScriptTarget.ES5, module: ts.ModuleKind.AMD }, /*extendedConfigCache*/ undefined, /*watchOptionsToExtend*/ undefined, system, ts.noop)!;
const builderProgram = ts.createIncrementalProgram({
rootNames: command.fileNames,
options: command.options,
Expand Down Expand Up @@ -200,6 +200,7 @@ describe("unittests:: tscWatch:: incremental:: emit file --incremental", () => {

assert.deepEqual(builderProgram.state.compilerOptions, {
incremental: true,
target: ts.ScriptTarget.ES5,
module: ts.ModuleKind.AMD,
configFilePath: config.path,
ignoreDeprecations: "6.0",
Expand Down Expand Up @@ -242,7 +243,7 @@ describe("unittests:: tscWatch:: incremental:: emit file --incremental", () => {
content: jsonToReadableText({
compilerOptions: {
incremental: true,
target: "es5",
target: "es2015",
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@DanielRosenwasser DanielRosenwasser Jan 31, 2026

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But so why is this one ES2015?

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@jakebailey jakebailey Jan 31, 2026

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I changed most tests that broke to es2015 first, and then flipped things back. In this case I'm sure I did it to avoid a deprecation error that messes up the incremental test.

module: "commonjs",
declaration: true,
emitDeclarationOnly: true,
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4 changes: 2 additions & 2 deletions src/testRunner/unittests/tscWatch/programUpdates.ts
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Expand Up @@ -985,7 +985,7 @@ declare const eval: any`,
{
compilerOptions: {
module: "commonjs",
target: "es5",
target: "es2015",
noImplicitAny: true,
sourceMap: false,
lib: [
Expand All @@ -1010,7 +1010,7 @@ declare const eval: any`,
{
compilerOptions: {
module: "commonjs",
target: "es5",
target: "es2015",
noImplicitAny: true,
sourceMap: false,
lib: [
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6 changes: 6 additions & 0 deletions tests/baselines/reference/ES3For-ofTypeCheck1(target=es5).errors.txt
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@@ -0,0 +1,6 @@
error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.


!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
==== ES3For-ofTypeCheck1.ts (0 errors) ====
for (var v of "") { }
6 changes: 6 additions & 0 deletions tests/baselines/reference/ES3For-ofTypeCheck2(target=es5).errors.txt
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@@ -0,0 +1,6 @@
error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.


!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
==== ES3For-ofTypeCheck2.ts (0 errors) ====
for (var v of [true]) { }
7 changes: 7 additions & 0 deletions tests/baselines/reference/ES3For-ofTypeCheck4(target=es5).errors.txt
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@@ -0,0 +1,7 @@
error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.


!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
==== ES3For-ofTypeCheck4.ts (0 errors) ====
var union: string | string[];
for (const v of union) { }
7 changes: 7 additions & 0 deletions tests/baselines/reference/ES3For-ofTypeCheck6(target=es5).errors.txt
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@@ -0,0 +1,7 @@
error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.


!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
==== ES3For-ofTypeCheck6.ts (0 errors) ====
var union: string[] | number[];
for (var v of union) { }
8 changes: 8 additions & 0 deletions tests/baselines/reference/ES5For-of1(target=es5).errors.txt
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@@ -0,0 +1,8 @@
error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.


!!! error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
==== ES5For-of1.ts (0 errors) ====
for (var v of ['a', 'b', 'c']) {
console.log(v);
}
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