Signal forms - Build error | Angular Community | Page 1

pseudo shale Dec 11, 2025, 10:04 AM

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Hello,
I'm seeing a build error in my application, regarding the Field from Angular signal forms:

✘ [ERROR] TS2420: Class 'Field<T>' incorrectly implements interface 'ɵControl<T>'.
  Type 'Field<T>' is missing the following properties from type 'ɵControl<T>': classes, ɵinteropControl, ɵregister [plugin angular-compiler]

    node_modules/.pnpm/@[email protected]_@[email protected]_@[email protected]_@angular+compiler@21._59c4d9426b2a8c81ae3dcc2ac0b93c37/node_modules/@angular/forms/types/_structure-chunk.d.ts:71:14:
      71 │ declare class Field<T> implements _Control<T> {
         ╵               ~~~~~

Any hints on what going on?

echo gyro Dec 11, 2025, 10:08 AM

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pseudo shale Hello, I'm seeing a build error in my application, regarding the `Field` from An...

Hello 21.0.4 has been released yesterday, it might be a bug.
@pastel saffron

charred light Dec 11, 2025, 4:02 PM

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I am also seeing this same build error when upgrading to 21.0.4.

worthy comet Dec 11, 2025, 4:42 PM

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Can you share the repro?

charred light Dec 11, 2025, 4:54 PM

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@worthy comet I have a repro here:

https://stackblitz.com/edit/stackblitz-starters-tpkw323z?file=package.json

StackBlitz

tlittle

Angular 21.0.4 - Broken - StackBlitz

An angular-cli project based on @angular/animations, @angular/common, @angular/compiler, @angular/core, @angular/forms, @angular/platform-browser, @angular/platform-browser-dynamic, @angular/router, core-js, rxjs, tslib and zone.js

worthy comet Dec 11, 2025, 5:09 PM

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Thank you!

worthy comet Dec 11, 2025, 5:56 PM

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Is this broken in stackblitz, or locally as well?

charred light Dec 11, 2025, 6:03 PM

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I just tested creating a new angular app locally and it seems to work fine there. Must be a Stacbklitz issue.

worthy comet Dec 11, 2025, 6:05 PM

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Interesting, we also can't repro outside of stackblitz

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looks like it's like this with skipLibCheck off

charred light Dec 11, 2025, 6:13 PM

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Ah I see. Setting that option to true will work for me. Appreciate it!

pastel saffron Dec 11, 2025, 6:44 PM

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fwiw, new projects are created with skipLibCheck: true, it's a recommended setting.

pseudo shale Dec 11, 2025, 7:13 PM

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For me the error was on my local machine. But I will test with the skipLibCheck: true.

pseudo shale Dec 11, 2025, 7:37 PM

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Ok, for me it's also fixed. Thank you for your help.

worthy comet Dec 11, 2025, 8:29 PM

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thanks for reporting

worthy comet Dec 12, 2025, 2:27 PM

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This has been fixed yesterday, should work now

#Signal forms - Build error