[experiment] merge iterable decls in DOM by jakebailey · Pull Request #63193 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-02-25T23:15:05Z

testing microsoft/TypeScript-DOM-lib-generator#2431 ahead of time

Jake Bailey (jakebailey) · 2026-02-25T23:15:17Z

TypeScript Bot (@typescript-bot) test it

TypeScript Bot (typescript-bot) · 2026-02-25T23:15:21Z

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

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

TypeScript Bot (typescript-bot) · 2026-02-25T23:36:24Z

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

There were interesting changes:

Branch only errors:

Package: w3c-css-typed-object-model-level-1
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/w3c-css-typed-object-model-level-1/index.d.ts
   30:13  error  TypeScript@local compile error: 
Subsequent variable declarations must have the same type.  Variable 'CSSUnparsedValue' must be of type '{ new (members: Iterable<CSSUnparsedSegment>): CSSUnparsedValue; prototype: CSSUnparsedValue; }', but here has type '{ new (members: CSSUnparsedSegment[]): CSSUnparsedValue; prototype: CSSUnparsedValue; }'                   @definitelytyped/expect
  180:13  error  TypeScript@local compile error: 
Subsequent variable declarations must have the same type.  Variable 'CSSTransformValue' must be of type '{ new (transforms: Iterable<CSSTransformComponent>): CSSTransformValue; prototype: CSSTransformValue; }', but here has type '{ new (transforms: CSSTransformComponent[]): CSSTransformValue; prototype: CSSTransformValue; }'  @definitelytyped/expect

✖ 2 problems (2 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@definitelytyped+dtslint@0.2.38_typescript@6.0.0-dev.20260225/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@definitelytyped+dtslint@0.2.38_typescript@6.0.0-dev.20260225/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

Package: resize-observer-browser
Error:

Error: 
/mnt/vss/_work/1/DefinitelyTyped/types/resize-observer-browser/resize-observer-browser-tests.ts
   2:63  error  TypeScript@local compile error: 
Argument of type '(entries: ResizeObserverEntry[]) => void' is not assignable to parameter of type 'ResizeObserverCallback'.
  Types of parameters 'entries' and 'entries' are incompatible.
    Type 'Iterable<ResizeObserverEntry>' is missing the following properties from type 'ResizeObserverEntry[]': length, pop, push, concat, and 24 more                      @definitelytyped/expect
  34:70  error  TypeScript@local compile error: 
Argument of type '(entries: readonly ResizeObserverEntry[]) => void' is not assignable to parameter of type 'ResizeObserverCallback'.
  Types of parameters 'entries' and 'entries' are incompatible.
    Type 'Iterable<ResizeObserverEntry>' is missing the following properties from type 'readonly ResizeObserverEntry[]': length, concat, join, slice, and 15 more  @definitelytyped/expect

✖ 2 problems (2 errors, 0 warnings)

    at combineErrorsAndWarnings (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@definitelytyped+dtslint@0.2.38_typescript@6.0.0-dev.20260225/node_modules/@definitelytyped/dtslint/dist/index.js:199:28)
    at runTests (/mnt/vss/_work/1/DefinitelyTyped/node_modules/.pnpm/@definitelytyped+dtslint@0.2.38_typescript@6.0.0-dev.20260225/node_modules/@definitelytyped/dtslint/dist/index.js:191:20)

You can check the log here.

TypeScript Bot (typescript-bot) · 2026-02-25T23:41:54Z

Jake Bailey (@jakebailey) Here are the results of running the user tests with tsc comparing main and refs/pull/63193/merge:

There were infrastructure failures potentially unrelated to your change:

1 instance of "Git clone failed"

Otherwise...

Something interesting changed - please have a look.

Details

effect

packages/effect/benchmark/tsconfig.json

[MISSING] error TS2345: Argument of type 'readonly string[] | undefined' is not assignable to parameter of type 'string[] | undefined'.
- packages/effect/src/internal/defaultServices/console.ts#L75

puppeteer

packages/puppeteer-core/tsconfig.json

[NEW] error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<IntersectionObserverEntry>'.
- packages/puppeteer-core/src/api/ElementHandle.ts#L1529 in packages/puppeteer-core/src/tsconfig.esm.json

TypeScript Bot (typescript-bot) · 2026-02-26T00:12:10Z

Jake Bailey (@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	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_82,521	_82,521	_~	_~	_~	_{p=1.000 n=6}
_Types	_125,280	_125,280	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{276,727k (± 0.64%)}	_{275,639k (± 0.66%)}	_~	_274,388k	_278,081k	_{p=0.471 n=6}
_{Parse Time}	_{1.30s (± 0.58%)}	_{1.31s (± 0.64%)}	_~	_1.29s	_1.31s	_{p=0.432 n=6}
_{Bind Time}	_{0.75s (± 0.68%)}	_{0.75s (± 0.72%)}	_~	_0.75s	_0.76s	_{p=0.640 n=6}
_{Check Time}	_{14.12s (± 0.82%)}	_{14.12s (± 0.60%)}	_~	_13.98s	_14.23s	_{p=0.936 n=6}
_{Emit Time}	_{2.67s (± 0.61%)}	_{2.67s (± 0.31%)}	_~	_2.66s	_2.68s	_{p=0.866 n=6}
_{Total Time}	_{18.84s (± 0.70%)}	_{18.85s (± 0.53%)}	_~	_18.68s	_18.98s	_{p=0.873 n=6}
_{angular-1 - node (v18.15.0, x64)}
_Errors	₃	₃	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_959,140	_958,620	_{-520 (- 0.05%)}	_~	_~	_{p=0.001 n=6}
_Types	_416,034	_416,056	_{+22 (+ 0.01%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{1,261,022k (± 0.01%)}	_{1,260,308k (± 0.00%)}	_{-714k (- 0.06%)}	_1,260,248k	_1,260,397k	_{p=0.005 n=6}
_{Parse Time}	_{8.01s (± 0.64%)}	_{8.03s (± 0.82%)}	_~	_7.96s	_8.11s	_{p=0.419 n=6}
_{Bind Time}	_{2.40s (± 0.81%)}	_{2.40s (± 0.78%)}	_~	_2.37s	_2.42s	_{p=0.870 n=6}
_{Check Time}	_{38.89s (± 0.38%)}	_{38.75s (± 0.19%)}	_~	_38.66s	_38.87s	_{p=0.109 n=6}
_{Emit Time}	_{18.03s (± 0.38%)}	_{17.98s (± 0.77%)}	_~	_17.83s	_18.16s	_{p=0.521 n=6}
_{Total Time}	_{67.32s (± 0.25%)}	_{67.16s (± 0.32%)}	_~	_66.95s	_67.51s	_{p=0.173 n=6}
_{mui-docs - node (v18.15.0, x64)}
_Errors	_11,438	_11,438	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_2,723,472	_2,723,149	_{-323 (- 0.01%)}	_~	_~	_{p=0.001 n=6}
_Types	_968,213	_968,212	_{-1 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{3,066,732k (± 0.02%)}	_{3,066,624k (± 0.01%)}	_~	_3,066,169k	_3,066,983k	_{p=0.810 n=6}
_{Parse Time}	_{10.32s (± 0.74%)}	_{10.32s (± 0.42%)}	_~	_10.25s	_10.37s	_{p=0.573 n=6}
_{Bind Time}	_{2.76s (± 0.77%)}	_{2.76s (± 0.67%)}	_~	_2.73s	_2.78s	_{p=0.806 n=6}
_{Check Time}	_{116.05s (± 0.50%)}	_{115.17s (± 0.28%)}	_{-0.88s (- 0.76%)}	_114.71s	_115.46s	_{p=0.005 n=6}
_{Emit Time}	_{0.40s (± 1.87%)}	_{0.40s (± 1.87%)}	_~	_0.39s	_0.41s	_{p=1.000 n=6}
_{Total Time}	_{129.53s (± 0.49%)}	_{128.65s (± 0.29%)}	_{-0.88s (- 0.68%)}	_128.17s	_129.02s	_{p=0.020 n=6}
_{self-build-src - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,253,407	_1,253,407	_~	_~	_~	_{p=1.000 n=6}
_Types	_260,208	_260,208	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{2,396,195k (± 0.01%)}	_{2,396,641k (± 0.01%)}	_{+447k (+ 0.02%)}	_2,396,450k	_2,396,916k	_{p=0.005 n=6}
_{Parse Time}	_{5.16s (± 0.57%)}	_{5.16s (± 1.22%)}	_~	_5.09s	_5.24s	_{p=0.936 n=6}
_{Bind Time}	_{1.86s (± 1.21%)}	_{1.85s (± 1.70%)}	_~	_1.81s	_1.89s	_{p=0.629 n=6}
_{Check Time}	_{35.59s (± 0.23%)}	_{35.63s (± 0.28%)}	_~	_35.47s	_35.75s	_{p=0.521 n=6}
_{Emit Time}	_{3.03s (± 1.28%)}	_{3.04s (± 2.16%)}	_~	_2.97s	_3.15s	_{p=1.000 n=6}
_{Total Time}	_{45.67s (± 0.16%)}	_{45.71s (± 0.27%)}	_~	_45.56s	_45.89s	_{p=0.810 n=6}
_{self-build-src-public-api - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_1,253,407	_1,253,407	_~	_~	_~	_{p=1.000 n=6}
_Types	_260,208	_260,208	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{3,194,118k (± 0.02%)}	_{3,072,899k (± 9.65%)}	_~	_2,467,089k	_3,194,725k	_{p=0.575 n=6}
_{Parse Time}	_{8.46s (± 0.90%)}	_{8.39s (± 1.18%)}	_~	_8.21s	_8.50s	_{p=0.377 n=6}
_{Bind Time}	_{2.75s (± 0.93%)}	_{2.77s (± 1.26%)}	_~	_2.72s	_2.83s	_{p=0.125 n=6}
_{Check Time}	_{53.60s (± 0.24%)}	_{53.49s (± 0.52%)}	_~	_53.05s	_53.92s	_{p=0.230 n=6}
_{Emit Time}	_{4.37s (± 1.66%)}	_{4.35s (± 1.27%)}	_~	_4.29s	_4.45s	_{p=0.471 n=6}
_{Total Time}	_{69.18s (± 0.12%)}	_{69.00s (± 0.56%)}	_~	_68.40s	_69.62s	_{p=0.066 n=6}
_{self-compiler - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_265,173	_265,173	_~	_~	_~	_{p=1.000 n=6}
_Types	_104,282	_104,282	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{444,297k (± 0.01%)}	_{444,335k (± 0.01%)}	_~	_444,264k	_444,412k	_{p=0.471 n=6}
_{Parse Time}	_{2.88s (± 0.31%)}	_{2.88s (± 0.77%)}	_~	_2.86s	_2.91s	_{p=0.684 n=6}
_{Bind Time}	_{1.16s (± 0.45%)}	_{1.16s (± 0.54%)}	_~	_1.15s	_1.17s	_{p=0.386 n=6}
_{Check Time}	_{16.07s (± 0.36%)}	_{16.05s (± 0.22%)}	_~	_16.00s	_16.09s	_{p=0.936 n=6}
_{Emit Time}	_{1.32s (± 0.75%)}	_{1.32s (± 0.62%)}	_~	_1.31s	_1.33s	_{p=0.383 n=6}
_{Total Time}	_{21.42s (± 0.34%)}	_{21.42s (± 0.15%)}	_~	_21.37s	_21.46s	_{p=0.809 n=6}
_{ts-pre-modules - node (v18.15.0, x64)}
_Errors	₂₇₁	₂₇₁	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_225,897	_225,897	_~	_~	_~	_{p=1.000 n=6}
_Types	_93,564	_93,564	_~	_~	_~	_{p=1.000 n=6}
_{Memory used}	_{371,645k (± 0.02%)}	_{371,619k (± 0.03%)}	_~	_371,450k	_371,771k	_{p=0.936 n=6}
_{Parse Time}	_{2.85s (± 0.75%)}	_{2.85s (± 0.98%)}	_~	_2.81s	_2.89s	_{p=0.936 n=6}
_{Bind Time}	_{1.64s (± 1.05%)}	_{1.62s (± 0.96%)}	_{-0.02s (- 1.32%)}	_1.59s	_1.63s	_{p=0.048 n=6}
_{Check Time}	_{17.46s (± 0.36%)}	_{17.46s (± 0.41%)}	_~	_17.38s	_17.58s	_{p=0.809 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{21.96s (± 0.23%)}	_{21.93s (± 0.35%)}	_~	_21.83s	_22.06s	_{p=0.376 n=6}
_{vscode - node (v18.15.0, x64)}
_Errors	₀	₀	_~	_~	_~	_{p=NaN n=0}
_Symbols	₀	₀	_~	_~	_~	_{p=NaN n=0}
_Types	₀	₀	_~	_~	_~	_{p=NaN n=0}
_{Memory used}	_0k	_0k	_~	_~	_~	_{p=NaN n=0}
_{Parse Time}	_0s	_0s	_~	_~	_~	_{p=NaN n=0}
_{Bind Time}	_0s	_0s	_~	_~	_~	_{p=NaN n=0}
_{Check Time}	_0s	_0s	_~	_~	_~	_{p=NaN n=0}
_{Emit Time}	_0s	_0s	_~	_~	_~	_{p=NaN n=0}
_{Total Time}	_0s	_0s	_~	_~	_~	_{p=NaN n=0}
_{webpack - node (v18.15.0, x64)}
_Errors	₄₂	₄₂	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_407,558	_407,231	_{-327 (- 0.08%)}	_~	_~	_{p=0.001 n=6}
_Types	_186,243	_186,227	_{-16 (- 0.01%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{569,232k (± 0.02%)}	_{568,610k (± 0.01%)}	_{-623k (- 0.11%)}	_568,492k	_568,699k	_{p=0.005 n=6}
_{Parse Time}	_{4.76s (± 1.10%)}	_{4.76s (± 0.88%)}	_~	_4.73s	_4.83s	_{p=0.872 n=6}
_{Bind Time}	_{2.03s (± 0.74%)}	_{2.04s (± 0.84%)}	_~	_2.02s	_2.07s	_{p=0.511 n=6}
_{Check Time}	_{24.52s (± 0.30%)}	_{24.54s (± 0.42%)}	_~	_24.45s	_24.72s	_{p=0.748 n=6}
_{Emit Time}	_{0.00s (±154.76%)}	_{0.00s (±154.76%)}	_~	_0.00s	_0.01s	_{p=1.000 n=6}
_{Total Time}	_{31.32s (± 0.35%)}	_{31.35s (± 0.41%)}	_~	_31.24s	_31.60s	_{p=0.748 n=6}
_{xstate-main - node (v18.15.0, x64)}
_Errors	₃₀	₃₀	_~	_~	_~	_{p=1.000 n=6}
_Symbols	_764,212	_763,905	_{-307 (- 0.04%)}	_~	_~	_{p=0.001 n=6}
_Types	_219,050	_219,048	_{-2 (- 0.00%)}	_~	_~	_{p=0.001 n=6}
_{Memory used}	_{684,898k (± 0.01%)}	_{684,395k (± 0.01%)}	_{-503k (- 0.07%)}	_684,328k	_684,451k	_{p=0.005 n=6}
_{Parse Time}	_{4.92s (± 1.35%)}	_{4.92s (± 0.35%)}	_~	_4.90s	_4.95s	_{p=0.686 n=6}
_{Bind Time}	_{1.58s (± 0.78%)}	_{1.60s (± 1.25%)}	_{+0.03s (+ 1.59%)}	_1.57s	_1.63s	_{p=0.032 n=6}
_{Check Time}	_{22.66s (± 0.50%)}	_{22.65s (± 0.52%)}	_~	_22.53s	_22.86s	_{p=0.936 n=6}
_{Emit Time}	_0.00s	_0.00s	_~	_~	_~	_{p=1.000 n=6}
_{Total Time}	_{29.16s (± 0.42%)}	_{29.17s (± 0.44%)}	_~	_29.01s	_29.39s	_{p=0.936 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 (typescript-bot) · 2026-02-26T00:28:40Z

Jake Bailey (@jakebailey) Here are the results of running the top 400 repos with tsc comparing main and refs/pull/63193/merge:

Something interesting changed - please have a look.

Details

bvaughn/react-window

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

tsconfig.json

error TS2345: Argument of type '(args: ResizeObserverEntry[]) => void' is not assignable to parameter of type 'ResizeObserverCallback'.
- lib/components/list/useDynamicRowHeight.ts#L108

RSSNext/Folo

14 of 18 projects failed to build with the old tsc and were ignored

apps/mobile/web-app/html-renderer/tsconfig.json

error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- apps/mobile/web-app/html-renderer/src/common/WrappedElementProvider.tsx#L60

tldraw/tldraw

29 of 34 projects failed to build with the old tsc and were ignored

apps/analytics/tsconfig.json

error TS2339: Property 'some' does not exist on type 'Iterable<MutationRecord>'.
- apps/analytics/src/state/theme-state.ts#L26 in apps/analytics/tsconfig.json
error TS7006: Parameter 'mutation' implicitly has an 'any' type.
- apps/analytics/src/state/theme-state.ts#L26 in apps/analytics/tsconfig.json

transloadit/uppy

19 of 62 projects failed to build with the old tsc and were ignored

private/dev/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json
error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- packages/@uppy/dashboard/src/Dashboard.tsx#L617 in packages/@uppy/dashboard/tsconfig.build.json

packages/@uppy/vue/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json
error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- packages/@uppy/dashboard/src/Dashboard.tsx#L617 in packages/@uppy/dashboard/tsconfig.build.json

packages/@uppy/vue/tsconfig.build.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json
error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- packages/@uppy/dashboard/src/Dashboard.tsx#L617 in packages/@uppy/dashboard/tsconfig.build.json

packages/@uppy/utils/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.json

packages/@uppy/url/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/unsplash/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/tus/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/transloadit/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/thumbnail-generator/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/status-bar/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/screen-capture/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/remote-sources/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json
error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- packages/@uppy/dashboard/src/Dashboard.tsx#L617 in packages/@uppy/dashboard/tsconfig.build.json

packages/@uppy/react/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json
error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- packages/@uppy/dashboard/src/Dashboard.tsx#L617 in packages/@uppy/dashboard/tsconfig.build.json

packages/@uppy/react/tsconfig.build.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json
error TS7053: Element implicitly has an 'any' type because expression of type '0' can't be used to index type 'Iterable<ResizeObserverEntry>'.
- packages/@uppy/dashboard/src/Dashboard.tsx#L617 in packages/@uppy/dashboard/tsconfig.build.json

packages/@uppy/provider-views/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/onedrive/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/locales/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/locales/tsconfig.build.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/instagram/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/image-generator/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/image-generator/tsconfig.build.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/image-editor/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/google-photos-picker/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/google-drive-picker/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/google-drive/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/form/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/facebook/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/dropbox/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/drop-target/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/drag-drop/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/drag-drop/tsconfig.build.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/core/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/compressor/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/components/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/companion-client/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/box/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/aws-s3/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

packages/@uppy/audio/tsconfig.json

error TS2339: Property 'length' does not exist on type 'Iterable<FileSystemEntry>'.
- packages/@uppy/utils/src/getDroppedFiles/utils/webkitGetAsEntryApi/getFilesAndDirectoriesFromDirectory.ts#L15 in packages/@uppy/utils/tsconfig.build.json

tusen-ai/naive-ui

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

src/tsconfig.demo.json

error TS2339: Property 'forEach' does not exist on type 'Iterable<IntersectionObserverEntry>'.
- src/image/src/utils.ts#L79 in src/tsconfig.demo.json
error TS7006: Parameter 'entry' implicitly has an 'any' type.
- src/image/src/utils.ts#L79 in src/tsconfig.demo.json
error TS2345: Argument of type '(value: readonly FileSystemEntry[] | PromiseLike<readonly FileSystemEntry[]>) => void' is not assignable to parameter of type 'FileSystemEntriesCallback'.
- src/upload/src/utils.ts#L81 in src/tsconfig.demo.json

yamadashy/repomix

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

website/client/tsconfig.json

error TS2345: Argument of type '(entries: FileSystemEntry[]) => Promise<void>' is not assignable to parameter of type 'FileSystemEntriesCallback'.
- website/client/composables/useFileUpload.ts#L284

[experiment] merge iterable decls in DOM

19270ba

TypeScript Bot (typescript-bot) assigned Jake Bailey (jakebailey) Feb 25, 2026

TypeScript Bot (typescript-bot) added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Feb 25, 2026

Jake Bailey (jakebailey) mentioned this pull request Feb 26, 2026

Fully merge iterable types into existing definitions microsoft/TypeScript-DOM-lib-generator#2431

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Jake Bailey (jakebailey) closed this Feb 26, 2026

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Jake Bailey (jakebailey) commented Feb 25, 2026

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TypeScript Bot (typescript-bot) commented Feb 26, 2026

tsc

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TypeScript Bot (typescript-bot) commented Feb 25, 2026 •

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