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import { NgModule, Optional, SkipSelf } from '@angular/core';
import { CommonModule } from '@angular/common';
@NgModule({
declarations: [],
imports: [
CommonModule
]
})
export class CoreModule {
constructor(@Optional() @SkipSelf() parentModule: CoreModule) {
if(parentModule){
throw new Error('CoreModule 只允许在 AppModule 中加载。');
}
}
}