Angular: 21.0.0-next.3 Release

| Commit | Description | | -- | -- | | | remove refresh button from transfer state tab (#63592) |

compiler-cli

| Commit | Description | | -- | -- | | | enable type checking of host bindings by default (#63654) |

core

| Commit | Description | | -- | -- | | | introduce BootstrapContext for improved server bootstrapping (#63562) | | | drop support for TypeScript 5.8 (#63589) |

migrations

| Commit | Description | | -- | -- | | | fix bug in ngclass-to-class migration (#63617) |

Breaking Changes

compiler-cli

• * Previously hidden type issues in host bindings may show up in your builds. Either resolve the type issues or set "typeCheckHostBindings": false in the angularCompilerOptions section of your tsconfig. ### core
• The server-side bootstrapping process has been changed to eliminate the reliance on a global platform injector.

Before: ts const bootstrap = () => bootstrapApplication(AppComponent, config);

After: ts const bootstrap = (context: BootstrapContext) => bootstrapApplication(AppComponent, config, context);

A schematic is provided to automatically update main.server.ts files to pass the BootstrapContext to the bootstrapApplication call.

In addition, getPlatform() and destroyPlatform() will now return null and be a no-op respectively when running in a server environment.

For more information please see: https://github.com/angular/angular/security/advisories/GHSA-68x2-mx4q-78m7

• * TypeScript versions less than 5.9 are no longer supported.