Fix Migration Error in Angular

Angular Version Migration Errors

Angular's major version upgrades introduce breaking changes. The ng update command helps, but manual fixes are often needed.

Using ng update

# Check what needs updating
ng update

# Update Angular core and CLI
ng update @angular/core @angular/cli

# Update Angular Material if used
ng update @angular/material

Common Migration Errors

Standalone Components (Angular 15+):

Older projects use NgModules. Migrating to standalone:

// Before (NgModule)
@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule, FormsModule],
  bootstrap: [AppComponent]
})
export class AppModule {}

// After (Standalone)
@Component({
  standalone: true,
  imports: [FormsModule],
  selector: 'app-root',
  template: '...'
})
export class AppComponent {}

// main.ts
bootstrapApplication(AppComponent, {
  providers: [provideRouter(routes)]
});

Use the schematic:

ng generate @angular/core:standalone

TypeScript Version Mismatch:

# Angular 17 requires TypeScript 5.2+
npm install typescript@~5.2.0

RxJS 7 Breaking Changes:

// Old
import { of } from 'rxjs/observable/of';
// New
import { of } from 'rxjs';

// Old
.pipe(pluck('data'))
// New
.pipe(map(response => response.data))

Step-by-Step Upgrades

Never skip major versions. Go 14→15→16→17, not 14→17. Each version has its own migration schematics.

Bugsly captures runtime errors that surface after migrations — new deprecation warnings and breaking API changes often manifest as subtle bugs that Bugsly detects early.