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

jakebailey · 2026-01-30T03:37:34Z

target now defaults to ScriptTarget.LatestStandard, which is an alias to the most recent standardized ES version, currently ES2024 (until we add ES2025).

target=ES5 is now deprecated.

#63066 got most tests ready, but a few unit tests still needed to be updated. Individual commits may be a better way to review this.

Fixes #62196
Fixes #62198

typescript-bot · 2026-01-30T03:38:00Z

Thanks for the PR! It looks like you've changed the TSServer protocol in some way. Please ensure that any changes here don't break consumers of the current TSServer API. For some extra review, we'll ping @sheetalkamat, @mjbvz, and @joj for you. Feel free to loop in other consumers/maintainers if necessary.

typescript-bot · 2026-01-30T03:38:01Z

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

jakebailey · 2026-01-30T03:38:19Z

@typescript-bot test it
@typescript-bot pack this

typescript-bot · 2026-01-30T03:38:24Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`pack this`	✅ Started	✅ Results
`test top400`	✅ Started	👀 Results
`user test this`	✅ Started	👀 Results
`run dt`	✅ Started	👀 Results
`perf test this faster`	✅ Started	👀 Results

src/compiler/types.ts

typescript-bot · 2026-01-30T03:42:49Z

Hey @jakebailey, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/167004/artifacts?artifactName=tgz&fileId=EF769C50B14300245DEC1C19259502941AC541B769FEE5839095048E28F6936902&fileName=/typescript-6.0.0-insiders.20260130.tgz"
    }
}

and then running npm install.

There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@6.0.0-pr-63067-4".;

jakebailey · 2026-01-30T03:45:38Z

src/compiler/utilities.ts

        computeValue: (compilerOptions): ModuleKind => {
            return typeof compilerOptions.module === "number" ?
                compilerOptions.module :
                _computedOptions.target.computeValue(compilerOptions) >= ScriptTarget.ES2015 ? ModuleKind.ES2015 : ModuleKind.CommonJS;


In a later PR, I will update this to set other ModuleKinds based on the target.

typescript-bot · 2026-01-30T04:08:14Z

@jakebailey Here are the results of running the user tests with tsc comparing main and refs/pull/63067/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Package install failed"
1 instance of "Git clone failed"

Otherwise...

Something interesting changed - please have a look.

Details

acorn

/mnt/ts_downloads/_/m/acorn/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/acorn/index.ts(1,1)

adonis-framework

/mnt/ts_downloads/_/m/adonis-framework/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/adonis-framework/index.ts(1,1)

ajv

/mnt/ts_downloads/_/m/ajv/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/ajv/index.ts(1,1)

antd

/mnt/ts_downloads/_/m/antd/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/antd/index.ts(1,1)

assert

/mnt/ts_downloads/_/m/assert/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/assert/index.ts(1,1)

async

/mnt/ts_downloads/_/m/async/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/async/index.ts(1,1)

axios

/mnt/ts_downloads/_/m/axios/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/axios/index.ts(1,1)

bcryptjs

/mnt/ts_downloads/_/m/bcryptjs/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/bcryptjs/index.ts(1,1)

bignumber.js

/mnt/ts_downloads/_/m/bignumber.js/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/bignumber.js/index.ts(1,1)

bluebird

/mnt/ts_downloads/_/m/bluebird/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/bluebird/index.ts(1,1)

clear-require

/mnt/ts_downloads/_/m/clear-require/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/clear-require/index.ts(1,1)

clone

/mnt/ts_downloads/_/m/clone/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/clone/index.ts(1,1)

content-disposition

/mnt/ts_downloads/_/m/content-disposition/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/content-disposition/index.ts(1,1)

debug

/mnt/ts_downloads/_/m/debug/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/debug/index.ts(1,1)

discord.js

/mnt/ts_downloads/_/m/discord.js/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/discord.js/index.ts(1,1)

electron

/mnt/ts_downloads/_/m/electron/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/electron/index.ts(1,1)

eventemitter2

/mnt/ts_downloads/_/m/eventemitter2/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/eventemitter2/index.ts(1,1)

eventemitter3

/mnt/ts_downloads/_/m/eventemitter3/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/eventemitter3/index.ts(1,1)

firebase

/mnt/ts_downloads/_/m/firebase/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/firebase/index.ts(1,1)

follow-redirects

/mnt/ts_downloads/_/m/follow-redirects/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/follow-redirects/index.ts(1,1)

fp-ts

tsconfig.json

[NEW] error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- tsconfig.json#L5

tsconfig.build-es6.json

[NEW] error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- tsconfig.build-es6.json#L3

examples/tsconfig.json

[NEW] error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- examples/tsconfig.json#L3

dtslint/tsconfig.json

[NEW] error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- dtslint/tsconfig.json#L4

graceful-fs

/mnt/ts_downloads/_/m/graceful-fs/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/graceful-fs/index.ts(1,1)

immutable

/mnt/ts_downloads/_/m/immutable/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/immutable/index.ts(1,1)

isobject

/mnt/ts_downloads/_/m/isobject/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/isobject/index.ts(1,1)

jimp

/mnt/ts_downloads/_/m/jimp/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/jimp/index.ts(1,1)

jsonschema

/mnt/ts_downloads/_/m/jsonschema/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/jsonschema/index.ts(1,1)

keycode

/mnt/ts_downloads/_/m/keycode/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/keycode/index.ts(1,1)

localforage

/mnt/ts_downloads/_/m/localforage/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/localforage/index.ts(1,1)

lodash

/mnt/ts_downloads/_/m/lodash/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/lodash/index.ts(1,1)

log4js

/mnt/ts_downloads/_/m/log4js/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/log4js/index.ts(1,1)

minimatch

/mnt/ts_downloads/_/m/minimatch/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/minimatch/index.ts(1,1)

mobx

/mnt/ts_downloads/_/m/mobx/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/mobx/index.ts(1,1)

moment

/mnt/ts_downloads/_/m/moment/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/moment/index.ts(1,1)

mqtt

/mnt/ts_downloads/_/m/mqtt/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/mqtt/index.ts(1,1)

npmlog

/mnt/ts_downloads/_/m/npmlog/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/npmlog/index.ts(1,1)

octokit-rest

/mnt/ts_downloads/_/m/octokit-rest/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/octokit-rest/index.ts(1,1)

portfinder

/mnt/ts_downloads/_/m/portfinder/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/portfinder/index.ts(1,1)

protobufjs

/mnt/ts_downloads/_/m/protobufjs/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/protobufjs/index.ts(1,1)

redux

/mnt/ts_downloads/_/m/redux/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/redux/index.ts(1,1)

reselect

/mnt/ts_downloads/_/m/reselect/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/reselect/index.ts(1,1)

rxjs

/mnt/ts_downloads/_/m/rxjs/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/rxjs/index.ts(1,1)

should

/mnt/ts_downloads/_/m/should/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/should/index.ts(1,1)

sift

/mnt/ts_downloads/_/m/sift/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/sift/index.ts(1,1)

soap

/mnt/ts_downloads/_/m/soap/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/soap/index.ts(1,1)

sugar

/mnt/ts_downloads/_/m/sugar/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/sugar/index.ts(1,1)

tslint

/mnt/ts_downloads/_/m/tslint/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/tslint/index.ts(1,1)

uglify-js

/mnt/ts_downloads/_/m/uglify-js/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/uglify-js/index.ts(1,1)

url-search-params

/mnt/ts_downloads/_/m/url-search-params/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/url-search-params/index.ts(1,1)

util

/mnt/ts_downloads/_/m/util/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/util/index.ts(1,1)

vue

/mnt/ts_downloads/_/m/vue/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/vue/index.ts(1,1)

vuex

/mnt/ts_downloads/_/m/vuex/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/vuex/index.ts(1,1)

webpack

tsconfig.hot.json

[NEW] error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- tsconfig.hot.json#L3

xlsx

/mnt/ts_downloads/_/m/xlsx/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/xlsx/index.ts(1,1)

xpath

/mnt/ts_downloads/_/m/xpath/tsconfig.json

[NEW] error TS1202: Import assignment cannot be used when targeting ECMAScript modules. Consider using 'import * as ns from "mod"', 'import {a} from "mod"', 'import d from "mod"', or another module format instead.
- /mnt/ts_downloads/_/m/xpath/index.ts(1,1)

typescript-bot · 2026-01-30T05:01:42Z

@jakebailey Here are the results of running the top 400 repos with tsc comparing main and refs/pull/63067/merge:

Something interesting changed - please have a look.

Details

apitable/apitable

14 of 15 projects failed to build with the old tsc and were ignored

packages/databus-client/tsconfig.json

error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- packages/databus-client/tsconfig.json#L4

basarat/typescript-book

10 of 15 projects failed to build with the old tsc and were ignored

code/async-await/es5/tsconfig.json

error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- code/async-await/es5/tsconfig.json#L3

compiler-explorer/compiler-explorer

4 of 7 projects failed to build with the old tsc and were ignored

tsconfig.frontend.tests.json

error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- Project Scope

faker-js/faker

1 of 2 projects failed to build with the old tsc and were ignored

cypress/tsconfig.json

error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- cypress/tsconfig.json#L3

radix-ui/primitives

64 of 68 projects failed to build with the old tsc and were ignored

cypress/tsconfig.json

error TS5107: Option 'target=ES5' is deprecated and will stop functioning in TypeScript 7.0. Specify compilerOption '"ignoreDeprecations": "6.0"' to silence this error.
- cypress/tsconfig.json#L3

RyanCavanaugh

Overall LGTM, I am OK with any proposed name for the "current" target version

jakebailey · 2026-01-31T01:23:26Z

@typescript-bot run dt

typescript-bot · 2026-01-31T01:23:30Z

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
`run dt`	✅ Started	✅ Results

DanielRosenwasser · 2026-01-31T01:22:24Z

src/testRunner/unittests/tscWatch/incremental.ts

                );
                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)!;


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

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

DanielRosenwasser · 2026-01-31T01:22:55Z

src/testRunner/unittests/tscWatch/incremental.ts

                    compilerOptions: {
                        incremental: true,
-                        target: "es5",
+                        target: "es2015",


But so why is this one ES2015?

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.

typescript-bot · 2026-01-31T01:45:00Z

Hey @jakebailey, the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

stale

Copilot AI review requested due to automatic review settings January 30, 2026 03:37

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Change all target=es5 to target=es6 DefinitelyTyped/DefinitelyTyped#74421

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Be more lenient about iteration when lib=es5 / noLib #63070

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jakebailey force-pushed the es-current-year branch from d912f0e to 4f65b2b Compare January 30, 2026 22:02

jakebailey changed the title ~~Default target to "current year", deprecate ES5~~ Default target to "latest standard", deprecate ES5 Jan 30, 2026

jakebailey added 2 commits January 30, 2026 14:55

dtsBundler target

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Force ES5 in convertToAsyncFunction tests

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jakebailey added 5 commits January 30, 2026 15:08

Add ScriptTarget.LatestStandard

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Default to LatestStandard

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Update baselines

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Deprecate ES5

f40b25c

Accept obviously correct baselines

212085d

jakebailey force-pushed the es-current-year branch from 4f65b2b to 212085d Compare January 30, 2026 23:15

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Try and fix react ModernComponent test for TS 6.0, take 2 DefinitelyTyped/DefinitelyTyped#74431

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jakebailey added the Breaking Change Would introduce errors in existing code label Jan 31, 2026

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Merged via the queue into microsoft:main with commit 95e3aaa Jan 31, 2026
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jakebailey deleted the es-current-year branch January 31, 2026 05:22

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Remove ES5 references, misc cleanup #63075

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

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

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/mnt/ts_downloads/_/m/acorn/tsconfig.json

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

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

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