Default `target` to "current year", deprecate ES5 #63067

jakebailey · 2026-01-30T03:37:34Z

target now defaults to ScriptTarget.CurrentYear, which is an alias to the most recent stable ES version, currently ES2024.

target=ES5 is now deprecated.

#63066 got most test 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

jakebailey · 2026-01-30T03:39:29Z

src/compiler/types.ts

    ESNext = 99,
    JSON = 100,
    Latest = ESNext,
+    CurrentYear = ES2024,


This value cannot be parsed out of a config. Perhaps it should be parsable.

And perhaps it should have a better name.

I am open to bikeshedding.

#62198 (comment) implied it should not be parsable.

LatestStable? LatestSpec?

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/[email protected]".;

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)

jakebailey · 2026-01-30T04:30:36Z

@typescript-bot run dt

typescript-bot · 2026-01-30T04:30:40Z

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

Command	Status	Results
`run dt`	✅ Started	👀 Results

typescript-bot · 2026-01-30T04:38:02Z

@jakebailey
The results of the perf run you requested are in!

Here they are:

tsc

Comparison Report - baseline..pr

_Metric	_baseline	_pr	_Delta	_Best	_Worst	_p-value
_{Compiler-Unions - node (v18.15.0, x64)}
_Errors	₂	₃	_{🔻+1 (+50.00%)}	_~	_~	_{p=0.001 n=6}
_Symbols	_62,370	_62,370	_~	_~	_~	_{p=1.000 n=6}
_Types	_50,387	_50,387	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{194,565k (± 1.02%)}	_{193,205k (± 0.75%)}	_~	_192,549k	_196,174k	_{p=0.128 n=6}
_{Parse Time}	_{1.31s (± 0.31%)}	_{1.30s (± 0.42%)}	_~	_1.30s	_1.31s	_{p=0.282 n=6}
_{Bind Time}	_0.76s	_0.76s	_~	_~	_~	_{p=1.000 n=6}
_{Check Time}	_{9.88s (± 0.19%)}	_{9.87s (± 0.32%)}	_~	_9.83s	_9.92s	_{p=0.809 n=6}
_{Emit Time}	_{2.75s (± 0.56%)}	_{2.74s (± 1.12%)}	_~	_2.70s	_2.78s	_{p=0.745 n=6}
_{Total Time}	_{14.70s (± 0.22%)}	_{14.67s (± 0.25%)}	_~	_14.66s	_14.75s	_{p=0.277 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₂	₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_955,823	_955,823	_~	_~	_~	_{p=1.000 n=6}
_Types	_415,853	_415,853	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{1,253,927k (± 0.00%)}	_{1,253,938k (± 0.01%)}	_~	_1,253,840k	_1,254,023k	_{p=0.689 n=6}
_{Parse Time}	_{6.52s (± 0.59%)}	_{6.51s (± 0.42%)}	_~	_6.48s	_6.56s	_{p=0.572 n=6}
_{Bind Time}	_{1.96s (± 0.26%)}	_{1.96s (± 0.32%)}	_~	_1.95s	_1.97s	_{p=0.386 n=6}
_{Check Time}	_{32.42s (± 0.23%)}	_{32.40s (± 0.34%)}	_~	_32.23s	_32.53s	_{p=0.873 n=6}
_{Emit Time}	_{15.01s (± 0.47%)}	_{15.00s (± 0.34%)}	_~	_14.96s	_15.08s	_{p=1.000 n=6}
_{Total Time}	_{55.91s (± 0.19%)}	_{55.87s (± 0.28%)}	_~	_55.65s	_56.09s	_{p=0.575 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	_11,439	_11,439	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,701,678	_2,701,678	_~	_~	_~	_{p=1.000 n=6}
_Types	_930,572	_930,572	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,037,101k (± 0.01%)}	_{3,037,053k (± 0.00%)}	_~	_3,036,863k	_3,037,152k	_{p=0.810 n=6}
_{Parse Time}	_{10.27s (± 0.48%)}	_{10.25s (± 0.39%)}	_~	_10.22s	_10.33s	_{p=0.421 n=6}
_{Bind Time}	_{2.76s (± 0.70%)}	_{2.76s (± 0.77%)}	_~	_2.74s	_2.80s	_{p=1.000 n=6}
_{Check Time}	_{110.46s (± 0.57%)}	_{111.67s (± 2.71%)}	_~	_109.89s	_117.68s	_{p=0.810 n=6}
_{Emit Time}	_{0.74s (±118.58%)}	_{0.39s (± 2.67%)}	_~	_0.37s	_0.40s	_{p=1.000 n=6}
_{Total Time}	_{124.23s (± 0.86%)}	_{125.07s (± 2.41%)}	_~	_123.25s	_131.05s	_{p=0.936 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,499	_1,252,473	_{-26 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,939	_259,933	_{-6 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{2,570,512k (±11.85%)}	_{2,387,841k (± 0.03%)}	_~	_2,387,238k	_2,388,965k	_{p=0.093 n=6}
_{Parse Time}	_{5.19s (± 1.30%)}	_{5.15s (± 0.85%)}	_~	_5.06s	_5.18s	_{p=0.228 n=6}
_{Bind Time}	_{1.86s (± 0.96%)}	_{1.86s (± 0.48%)}	_~	_1.85s	_1.87s	_{p=0.804 n=6}
_{Check Time}	_{35.52s (± 1.11%)}	_{35.53s (± 0.54%)}	_~	_35.35s	_35.88s	_{p=0.810 n=6}
_{Emit Time}	_{3.03s (± 2.50%)}	_{3.02s (± 1.87%)}	_~	_2.95s	_3.09s	_{p=0.689 n=6}
_{Total Time}	_{45.61s (± 0.92%)}	_{45.58s (± 0.52%)}	_~	_45.33s	_46.00s	_{p=0.689 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,252,499	_1,252,473	_{-26 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_Types	_259,939	_259,933	_{-6 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{3,061,873k (± 9.68%)}	_{3,183,665k (± 0.03%)}	_~	_3,182,592k	_3,184,650k	_{p=0.173 n=6}
_{Parse Time}	_{6.79s (± 0.93%)}	_{6.76s (± 1.43%)}	_~	_6.62s	_6.91s	_{p=0.688 n=6}
_{Bind Time}	_{2.27s (± 1.27%)}	_{2.24s (± 0.83%)}	_~	_2.22s	_2.27s	_{p=0.335 n=6}
_{Check Time}	_{43.06s (± 0.41%)}	_{43.03s (± 0.34%)}	_~	_42.75s	_43.19s	_{p=0.810 n=6}
_{Emit Time}	_{3.52s (± 2.99%)}	_{3.47s (± 2.42%)}	_~	_3.39s	_3.59s	_{p=0.521 n=6}
_{Total Time}	_{55.65s (± 0.34%)}	_{55.51s (± 0.41%)}	_~	_55.15s	_55.83s	_{p=0.336 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_264,692	_264,628	_{-64 (- 0.02%)}	_~	_~	_{p=0.001 n=6}
_Types	_104,082	_104,073	_{-9 (- 0.01%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{442,791k (± 0.01%)}	_{442,751k (± 0.01%)}	_~	_442,725k	_442,795k	_{p=0.128 n=6}
_{Parse Time}	_{2.84s (± 0.98%)}	_{2.85s (± 0.69%)}	_~	_2.83s	_2.88s	_{p=0.375 n=6}
_{Bind Time}	_{1.16s (± 0.54%)}	_{1.16s (± 0.35%)}	_~	_1.15s	_1.16s	_{p=0.673 n=6}
_{Check Time}	_{16.01s (± 0.21%)}	_{16.00s (± 0.32%)}	_~	_15.93s	_16.06s	_{p=1.000 n=6}
_{Emit Time}	_{1.31s (± 1.42%)}	_{1.32s (± 1.14%)}	_~	_1.30s	_1.34s	_{p=0.413 n=6}
_{Total Time}	_{21.32s (± 0.21%)}	_{21.33s (± 0.37%)}	_~	_21.21s	_21.40s	_{p=0.469 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₇₃	₇₄	_{+1 (+ 1.37%)}	_~	_~	_{p=0.001 n=6}
_Symbols	_225,493	_225,493	_~	_~	_~	_{p=1.000 n=6}
_Types	_94,373	_94,373	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{369,973k (± 0.10%)}	_{369,914k (± 0.07%)}	_~	_369,762k	_370,403k	_{p=0.810 n=6}
_{Parse Time}	_{2.81s (± 1.20%)}	_{2.82s (± 1.17%)}	_~	_2.76s	_2.85s	_{p=0.809 n=6}
_{Bind Time}	_{1.66s (± 0.82%)}	_{1.65s (± 1.07%)}	_~	_1.62s	_1.66s	_{p=0.405 n=6}
_{Check Time}	_{16.63s (± 0.30%)}	_{16.66s (± 0.46%)}	_~	_16.60s	_16.81s	_{p=0.422 n=6}
_{Emit Time}	_0.00s	_{0.00s (±244.70%)}	_~	_0.00s	_0.01s	_{p=0.405 n=6}
_{Total Time}	_{21.10s (± 0.40%)}	_{21.13s (± 0.47%)}	_~	_21.03s	_21.31s	_{p=0.573 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₁₁	₁₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_4,186,623	_4,186,623	_~	_~	_~	_{p=1.000 n=6}
_Types	_1,326,648	_1,326,648	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,979,520k (± 0.00%)}	_{3,979,428k (± 0.00%)}	_~	_3,979,129k	_3,979,612k	_{p=0.575 n=6}
_{Parse Time}	_{16.13s (± 0.80%)}	_{16.10s (± 0.52%)}	_~	_16.01s	_16.18s	_{p=0.688 n=6}
_{Bind Time}	_{5.43s (± 0.30%)}	_{5.43s (± 0.34%)}	_~	_5.40s	_5.45s	_{p=1.000 n=6}
_{Check Time}	_{120.53s (± 5.28%)}	_{122.13s (± 7.58%)}	_~	_113.82s	_139.89s	_{p=1.000 n=6}
_{Emit Time}	_{56.20s (±12.14%)}	_{57.36s (±12.82%)}	_~	_48.13s	_67.29s	_{p=0.936 n=6}
_{Total Time}	_{198.29s (± 4.07%)}	_{201.02s (± 4.87%)}	_~	_188.65s	_214.52s	_{p=1.000 n=6}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₁	₄₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_395,804	_395,804	_~	_~	_~	_{p=1.000 n=6}
_Types	_175,167	_175,167	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{548,344k (± 0.01%)}	_{548,283k (± 0.02%)}	_~	_548,162k	_548,463k	_{p=0.230 n=6}
_{Parse Time}	_{4.63s (± 0.18%)}	_{4.62s (± 0.18%)}	_~	_4.61s	_4.63s	_{p=0.796 n=6}
_{Bind Time}	_{2.02s (± 0.99%)}	_{2.00s (± 0.98%)}	_~	_1.97s	_2.02s	_{p=0.280 n=6}
_{Check Time}	_{24.09s (± 1.17%)}	_{23.94s (± 1.26%)}	_~	_23.41s	_24.20s	_{p=0.261 n=6}
_{Emit Time}	_{0.01s (±48.94%)}	_{0.00s (±244.70%)}	_{🟩-0.01s (-80.00%)}	_0.00s	_0.01s	_{p=0.034 n=6}
_{Total Time}	_{30.74s (± 0.94%)}	_{30.57s (± 1.04%)}	_~	_30.00s	_30.83s	_{p=0.092 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_731,941	_731,941	_~	_~	_~	_{p=1.000 n=6}
_Types	_219,279	_219,279	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{634,989k (± 0.01%)}	_{635,060k (± 0.01%)}	_~	_634,949k	_635,151k	_{p=0.066 n=6}
_{Parse Time}	_{4.56s (± 0.86%)}	_{4.59s (± 0.43%)}	_~	_4.56s	_4.62s	_{p=0.217 n=6}
_{Bind Time}	_{1.49s (± 0.51%)}	_{1.49s (± 0.78%)}	_~	_1.47s	_1.50s	_{p=0.933 n=6}
_{Check Time}	_{22.14s (± 0.34%)}	_{22.20s (± 0.39%)}	_~	_22.08s	_22.28s	_{p=0.260 n=6}
_{Emit Time}	_0.00s	_{0.00s (±244.70%)}	_~	_0.00s	_0.01s	_{p=0.405 n=6}
_{Total Time}	_{28.19s (± 0.32%)}	_{28.28s (± 0.32%)}	_~	_28.17s	_28.40s	_{p=0.173 n=6}

System info unknown

Hosts

node (v18.15.0, x64)

Scenarios

Compiler-Unions - node (v18.15.0, x64)
angular-1 - node (v18.15.0, x64)
mui-docs - node (v18.15.0, x64)
self-build-src - node (v18.15.0, x64)
self-build-src-public-api - node (v18.15.0, x64)
self-compiler - node (v18.15.0, x64)
ts-pre-modules - node (v18.15.0, x64)
vscode - node (v18.15.0, x64)
webpack - node (v18.15.0, x64)
xstate-main - node (v18.15.0, x64)

_Benchmark	_Name	_Iterations
_Current	_pr	₆
_Baseline	_baseline	₆

Developer Information:

Download Benchmarks

typescript-bot · 2026-01-30T04:53:42Z

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

There were interesting changes:

Branch only errors:

Package: activex-wia
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/activex-wia/activex-wia-tests.ts
   59:29  error  TypeScript@local compile error: 
Type 'Property[]' must have a '[Symbol.iterator]()' method that returns an iterator     @definitelytyped/expect
  122:29  error  TypeScript@local compile error: 
Type 'Property[]' must have a '[Symbol.iterator]()' method that returns an iterator     @definitelytyped/expect
  143:29  error  TypeScript@local compile error: 
Type 'DeviceEvent[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect
  218:26  error  TypeScript@local compile error: 
Type 'FilterInfo[]' must have a '[Symbol.iterator]()' method that returns an iterator   @definitelytyped/expect
  283:26  error  TypeScript@local compile error: 
Type 'FilterInfo[]' must have a '[Symbol.iterator]()' method that returns an iterator   @definitelytyped/expect
  329:32  error  TypeScript@local compile error: 
Type 'Item[]' must have a '[Symbol.iterator]()' method that returns an iterator         @definitelytyped/expect
  362:22  error  TypeScript@local compile error: 
Type 'DeviceInfo[]' must have a '[Symbol.iterator]()' method that returns an iterator   @definitelytyped/expect
  371:29  error  TypeScript@local compile error: 
Type 'Property[]' must have a '[Symbol.iterator]()' method that returns an iterator     @definitelytyped/expect
  453:40  error  TypeScript@local compile error: 
Type 'Item[]' must have a '[Symbol.iterator]()' method that returns an iterator         @definitelytyped/expect

✖ 9 problems (9 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: activex-vbide
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/activex-vbide/activex-vbide-tests.ts
  18:23  error  TypeScript@local compile error: 
Type 'VBProject[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect
  21:29  error  TypeScript@local compile error: 
Type 'unknown[]' must have a '[Symbol.iterator]()' method that returns an iterator    @definitelytyped/expect

✖ 2 problems (2 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: activex-excel
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/activex-excel/activex-excel-tests.ts
  303:25  error  TypeScript@local compile error: 
Type 'any[]' must have a '[Symbol.iterator]()' method that returns an iterator                @definitelytyped/expect
  340:30  error  TypeScript@local compile error: 
Type 'XlClipboardFormat[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect

✖ 2 problems (2 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: activex-adodb
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/activex-adodb/activex-adodb-tests.ts
  404:35  error  TypeScript@local compile error: 
Type 'Error[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect

✖ 1 problem (1 error, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: windows-script-host
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/windows-script-host/windows-script-host-tests.ts
  15:19  error  TypeScript@local compile error: 
Type 'string[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect
  22:23  error  TypeScript@local compile error: 
Type 'string[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect
  28:19  error  TypeScript@local compile error: 
Type 'string[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect

✖ 3 problems (3 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: activex-office
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/activex-office/activex-office-tests.ts
  21:20  error  TypeScript@local compile error: 
Type 'string[]' must have a '[Symbol.iterator]()' method that returns an iterator    @definitelytyped/expect
  25:20  error  TypeScript@local compile error: 
Type 'COMAddIn[]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect

✖ 2 problems (2 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: wallabyjs
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/wallabyjs/wallabyjs-tests.ts
  29:29  error  TypeScript@local compile error: 
Property 'wallaby' is used before its initialization  @definitelytyped/expect
  30:29  error  TypeScript@local compile error: 
Property 'wallaby' is used before its initialization  @definitelytyped/expect
  31:33  error  TypeScript@local compile error: 
Property 'wallaby' is used before its initialization  @definitelytyped/expect

✖ 3 problems (3 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: react
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/react/test/index.ts
  138:5   error  TypeScript@local compile error: 
Property 'context' will overwrite the base property in 'Component<Props, State, Snapshot>'. If this is intentional, add an initializer. Otherwise, add a 'declare' modifier or remove the redundant declaration  @definitelytyped/expect
  145:26  error  TypeScript@local compile error: 
Property 'context' is used before its initialization                                                                                                                                                             @definitelytyped/expect

✖ 2 problems (2 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: activex-adox
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/activex-adox/activex-adox-tests.ts
   138:27  error  TypeScript@local compile error: 
Type 'Table[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
   217:25  error  TypeScript@local compile error: 
Type 'User[]' must have a '[Symbol.iterator]()' method that returns an iterator            @definitelytyped/expect
   218:29  error  TypeScript@local compile error: 
'usrLoop' is possibly 'null'                                                               @definitelytyped/expect
   221:46  error  TypeScript@local compile error: 
'usrLoop' is possibly 'null'                                                               @definitelytyped/expect
   223:31  error  TypeScript@local compile error: 
Type 'Group[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
   224:41  error  TypeScript@local compile error: 
'group' is possibly 'null'                                                                 @definitelytyped/expect
   232:25  error  TypeScript@local compile error: 
Type 'Group[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
   233:29  error  TypeScript@local compile error: 
'grpLoop' is possibly 'null'                                                               @definitelytyped/expect
   236:45  error  TypeScript@local compile error: 
'grpLoop' is possibly 'null'                                                               @definitelytyped/expect
   238:30  error  TypeScript@local compile error: 
Type 'User[]' must have a '[Symbol.iterator]()' method that returns an iterator            @definitelytyped/expect
   239:41  error  TypeScript@local compile error: 
'user' is possibly 'null'                                                                  @definitelytyped/expect
   570:25  error  TypeScript@local compile error: 
Type 'Table[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
   572:29  error  TypeScript@local compile error: 
Type 'Index[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
   572:47  error  TypeScript@local compile error: 
'tblLoop' is possibly 'null'                                                               @definitelytyped/expect
   573:33  error  TypeScript@local compile error: 
'tblLoop' is possibly 'null'                                                               @definitelytyped/expect
   573:49  error  TypeScript@local compile error: 
'idxLoop' is possibly 'null'                                                               @definitelytyped/expect
   573:65  error  TypeScript@local compile error: 
'idxLoop' is possibly 'null'                                                               @definitelytyped/expect
   642:21  error  TypeScript@local compile error: 
Type 'Parameter[]' must have a '[Symbol.iterator]()' method that returns an iterator       @definitelytyped/expect
   643:29  error  TypeScript@local compile error: 
'prm' is possibly 'null'                                                                   @definitelytyped/expect
   643:42  error  TypeScript@local compile error: 
'prm' is possibly 'null'                                                                   @definitelytyped/expect
   760:19  error  TypeScript@local compile error: 
Type '[string, string]' must have a '[Symbol.iterator]()' method that returns an iterator  @definitelytyped/expect
   960:25  error  TypeScript@local compile error: 
Type 'Column[]' must have a '[Symbol.iterator]()' method that returns an iterator          @definitelytyped/expect
   961:17  error  TypeScript@local compile error: 
'colLoop' is possibly 'null'                                                               @definitelytyped/expect
   963:11  error  TypeScript@local compile error: 
'colLoop' is possibly 'null'                                                               @definitelytyped/expect
   964:18  error  TypeScript@local compile error: 
'colLoop' is possibly 'null'                                                               @definitelytyped/expect
   965:14  error  TypeScript@local compile error: 
'colLoop' is possibly 'null'                                                               @definitelytyped/expect
  1056:25  error  TypeScript@local compile error: 
Type 'Index[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
  1058:9   error  TypeScript@local compile error: 
'idxLoop' is possibly 'null'                                                               @definitelytyped/expect
  1059:21  error  TypeScript@local compile error: 
'idxLoop' is possibly 'null'                                                               @definitelytyped/expect
  1060:16  error  TypeScript@local compile error: 
'idxLoop' is possibly 'null'                                                               @definitelytyped/expect
  1061:35  error  TypeScript@local compile error: 
'idxLoop' is possibly 'null'                                                               @definitelytyped/expect
  1181:21  error  TypeScript@local compile error: 
Type 'Field[]' must have a '[Symbol.iterator]()' method that returns an iterator           @definitelytyped/expect
  1182:29  error  TypeScript@local compile error: 
'fld' is possibly 'null'                                                                   @definitelytyped/expect
  1182:41  error  TypeScript@local compile error: 
'fld' is possibly 'null'                                                                   @definitelytyped/expect
  1219:21  error  TypeScript@local compile error: 
Type 'TableIndex[]' must have a '[Symbol.iterator]()' method that returns an iterator      @definitelytyped/expect
  1220:69  error  TypeScript@local compile error: 
'col' is of type 'unknown'                                                                 @definitelytyped/expect

✖ 36 problems (36 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: backbone
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/backbone/backbone-tests.ts
  228:5  error  TypeScript@local compile error: 
Property 'model' will overwrite the base property in 'Collection<Book>'. If this is intentional, add an initializer. Otherwise, add a 'declare' modifier or remove the redundant declaration  @definitelytyped/expect

✖ 1 problem (1 error, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@[email protected][email protected]/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

You can check the log here.

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

jakebailey added 11 commits January 29, 2026 14:53

dtsBundler target

63f328f

Force ES5 in convertToAsyncFunction tests

f1ff6e0

Fix up tests which require a stable target

c203df7

Explicitly set target for codefix tsconfig tests

437f55a

Silence deprecations in transpile and evalulator unit tests

3136fd9

Update other unit tests to prevent deprecation errors

67cf114

Add ScriptTarget.CurrentYear

cef1f83

Default to CurrentYear

cea1fa4

Update baselines

85b3d7b

Deprecate ES5

e73a750

Accept obviously correct baselines

d912f0e

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

github-project-automation bot added this to PR Backlog Jan 30, 2026

github-project-automation bot moved this to Not started in PR Backlog Jan 30, 2026

typescript-bot assigned jakebailey Jan 30, 2026

typescript-bot added Author: Team For Milestone Bug PRs that fix a bug with a specific milestone labels Jan 30, 2026

jakebailey commented Jan 30, 2026

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jakebailey mentioned this pull request Jan 30, 2026

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

Merged

Default target to "current year", deprecate ES5 #63067

Are you sure you want to change the base?

Default target to "current year", deprecate ES5 #63067

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typescript-bot commented Jan 30, 2026

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Default `target` to "current year", deprecate ES5 #63067

Default `target` to "current year", deprecate ES5 #63067

typescript-bot commented Jan 30, 2026 •

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jakebailey Jan 30, 2026 •

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