src/collapse/collapse.module.ts
import { NgModule, ModuleWithProviders } from '@angular/core';
import { CollapseDirective } from './collapse.directive';
@NgModule({
declarations: [CollapseDirective],
exports: [CollapseDirective]
})
export class CollapseModule {
static forRoot(): ModuleWithProviders {
return { ngModule: CollapseModule, providers: [] };
}
}