angular-cn/aio/content/errors/NG1001.md

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@name Argument Not Literal
@category compiler
@shortDescription Decorator argument is not an object literal
@description
To make the metadata extraction in the Angular compiler faster, the decorators `@NgModule`, `@Pipe`, `@Component`, `@Directive`, and `@Injectable` accept only object literals as arguments.
This is an [intentional change in Ivy](https://github.com/angular/angular/issues/30840#issuecomment-498869540), which enforces stricter argument requirements for decorators than View Engine. Ivy requires this approach because it compiles decorators by moving the expressions into other locations in the class output.
@debugging
Move all declarations:
```typescript
const moduleDefinition = {...}
@NgModule(moduleDefinition)
export class AppModule {
constructor() {}
}
```
into the decorator:
```typescript
@NgModule({...})
export class AppModule {
constructor() {}
}
```