Angular 10.1.0‑next.5 Release Notes: Bug Fixes, New Features, and Breaking Changes

Angular 10.1.0‑next.5 has been released, providing a collection of bug fixes, new features, and breaking changes for developers.

Bug fixes

common: added boolean to valid JSON for testing.

core: migrated relative link resolution to use single quotes to align with the style guide.

forms: improved the type of the directive constructor’s arguments.

forms: included null in the abstract control’s .parent type.

language service: Ivy – mixed visitor should not find the let keyword.

router: correctly assigned ExtraOptions for the router in RouterTestingModule .

New features

compiler‑CLI: support for obtaining resource dependencies of source files.

forms: added migration for accessing AbstractControl.parent .

language service: added getDefinitionAndBoundSpan (go‑to‑definition).

language service: added quick‑info for inline templates in Ivy.

Breaking changes

forms: In the @angular/forms package, directives previously declared any[] as the type for validators and accepted an asyncValidators parameter of the same type; these parameters now have correct, stricter types, so code that relied on the old signatures may need updates for type safety.

forms: AbstractControl.parent type now includes null . If your code does not already handle this, the TypeScript compiler may raise errors. A v11 migration is available that adds non‑null assertion operators where necessary.

Additionally, null is now part of the .parent type; if you test against undefined , you should change the check to === null because the parent is explicitly initialized with null rather than undefined .