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Default `target` to "latest standard", deprecate ES5 by jakebailey · Pull Request #63067 · microsoft/TypeScript · GitHub

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

Merged
Jake Bailey (jakebailey) merged 11 commits into
microsoft:mainfrom
jakebailey:es-current-year
Jan 31, 2026
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Default target to "latest standard", deprecate ES5#63067
Jake Bailey (jakebailey) merged 11 commits into
microsoft:mainfrom
jakebailey:es-current-year

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Jake Bailey (jakebailey) commented Jan 30, 2026 •
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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

Copilot AI review requested due to automatic review settings January 30, 2026 03:37
github-project-automation Bot moved this to Not started in PR Backlog Jan 30, 2026
TypeScript Bot (typescript-bot) added Author: Team For Milestone Bug PRs that fix a bug with a specific milestone labels Jan 30, 2026

TypeScript Bot (typescript-bot) commented Jan 30, 2026

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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 Sheetal Nandi (@sheetalkamat), Matt Bierner (@mjbvz), and Joaquin Jares (@joj) for you. Feel free to loop in other consumers/maintainers if necessary.

TypeScript Bot (typescript-bot) commented Jan 30, 2026

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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 Daniel Rosenwasser (@DanielRosenwasser) and Ryan Cavanaugh (@RyanCavanaugh) are aware of the changes, just as a heads up.

Jake Bailey (jakebailey) commented Jan 30, 2026

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TypeScript Bot (@typescript-bot) test it
TypeScript Bot (@typescript-bot) pack this

TypeScript Bot (typescript-bot) commented Jan 30, 2026 •
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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

Jake Bailey (jakebailey) commented Jan 30, 2026
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Comment thread src/compiler/types.ts Outdated

TypeScript Bot (typescript-bot) commented Jan 30, 2026 •
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Hey Jake Bailey (@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".;

Jake Bailey (jakebailey) commented Jan 30, 2026
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Comment thread src/compiler/utilities.ts
computeValue: (compilerOptions): ModuleKind => {
return typeof compilerOptions.module === "number" ?
compilerOptions.module :
_computedOptions.target.computeValue(compilerOptions) >= ScriptTarget.ES2015 ? ModuleKind.ES2015 : ModuleKind.CommonJS;

Jake Bailey (jakebailey) Jan 30, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

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TypeScript Bot (typescript-bot) commented Jan 30, 2026

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Jake Bailey (@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.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.

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.

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.

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.

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)

Jake Bailey (jakebailey) mentioned this pull request Jan 30, 2026
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TypeScript Bot (typescript-bot) commented Jan 30, 2026

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Jake Bailey (@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.

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.

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.

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.

Ryan Cavanaugh (RyanCavanaugh) previously requested changes Jan 30, 2026
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

github-project-automation Bot moved this from Not started to Waiting on author in PR Backlog Jan 30, 2026
Jake Bailey (jakebailey) mentioned this pull request Jan 30, 2026
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Jake Bailey (jakebailey) changed the title Default target to "current year", deprecate ES5 Default target to "latest standard", deprecate ES5 Jan 30, 2026

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Jake Bailey (jakebailey) mentioned this pull request Jan 31, 2026
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Jake Bailey (jakebailey) commented Jan 31, 2026

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TypeScript Bot (@typescript-bot) run dt

TypeScript Bot (typescript-bot) commented Jan 31, 2026 •
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Starting jobs; this comment will be updated as builds start and complete.

Command Status Results
run dt ✅ Started ✅ Results

Daniel Rosenwasser (DanielRosenwasser) reviewed Jan 31, 2026
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Comment thread 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)!;

Daniel Rosenwasser (DanielRosenwasser) Jan 31, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

Jake Bailey (jakebailey) Jan 31, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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

Comment thread src/testRunner/unittests/tscWatch/incremental.ts
compilerOptions: {
incremental: true,
target: "es5",
target: "es2015",

Daniel Rosenwasser (DanielRosenwasser) Jan 31, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

But so why is this one ES2015?

Jake Bailey (jakebailey) Jan 31, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

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 (typescript-bot) commented Jan 31, 2026

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Hey Jake Bailey (@jakebailey), the results of running the DT tests are ready.

Everything looks the same!

You can check the log here.

Jake Bailey (jakebailey) added the Breaking Change Would introduce errors in existing code label Jan 31, 2026
Jake Bailey (jakebailey) added this pull request to the merge queue Jan 31, 2026
Merged via the queue into microsoft:main with commit 95e3aaa Jan 31, 2026
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Jake Bailey (jakebailey) deleted the es-current-year branch January 31, 2026 05:22
github-project-automation Bot moved this from Waiting on author to Done in PR Backlog Jan 31, 2026
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Change default --target to latest ECMAScript version Deprecate --target es5, make lowest target es2015

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