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docs: provide more info on the NO_ERRORS_SCHEMA schema (#42327)

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The `NO_ERRORS_SCHEMA` schema can be used to ignore errors related to unknown elements or properties, but since it suppresses these errors it may also hide real problems in a template. This commit updates the `NO_ERRORS_SCHEMA` docs to mention that.

Closes #39454.

PR Close #42327
This commit is contained in:
Andrew Kushnir 2021-05-25 13:09:31 -07:00 committed by Jessica Janiuk
parent afd68e5674
commit f4c55e464a
2 changed files with 6 additions and 2 deletions
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4
aio/content/examples/testing/src/app/about/about.component.spec.ts
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@ -1,4 +1,4 @@
import { NO_ERRORS_SCHEMA } from '@angular/core'; import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { ComponentFixture, TestBed } from '@angular/core/testing'; import { ComponentFixture, TestBed } from '@angular/core/testing';
import { AboutComponent } from './about.component'; import { AboutComponent } from './about.component';
@ -11,7 +11,7 @@ describe('AboutComponent (highlightDirective)', () => {
beforeEach(() => { beforeEach(() => {
fixture = TestBed.configureTestingModule({ fixture = TestBed.configureTestingModule({
declarations: [ AboutComponent, HighlightDirective ], declarations: [ AboutComponent, HighlightDirective ],
schemas: [ NO_ERRORS_SCHEMA ] schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
}) })
.createComponent(AboutComponent); .createComponent(AboutComponent);
fixture.detectChanges(); // initial binding fixture.detectChanges(); // initial binding

4
packages/core/src/metadata/schema.ts
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@ -35,6 +35,10 @@ export const CUSTOM_ELEMENTS_SCHEMA: SchemaMetadata = {
/** /**
* Defines a schema that allows any property on any element. * Defines a schema that allows any property on any element.
* *
* This schema allows you to ignore the errors related to any unknown elements or properties in a
* template. The usage of this schema is generally discouraged because it prevents useful validation
* and may hide real errors in your template. Consider using the `CUSTOM_ELEMENTS_SCHEMA` instead.
*
* @publicApi * @publicApi
*/ */
export const NO_ERRORS_SCHEMA: SchemaMetadata = { export const NO_ERRORS_SCHEMA: SchemaMetadata = {