Custom Angular 2 directive not working

Question

Error
Template parse errors:
Can't bind to 'time-delta' since it isn't a known property of 'p'.

Solution in documentation
I have to add the Directive to declarations array. I've done this already.

Now my architecture: I have three Modules:

• AppModule (root)
• TimeModule (should be a helper module later with some directives)
• AuthModule (Login, Sign up components and so on)

The AppModule:

@NgModule({
    imports: [
        TimeModule,
        BrowserModule,
        FormsModule,
        AuthModule,
        routing,
    ],
    declarations: [
        AppComponent
    ],
    providers: [
        appRoutingProviders
    ],
    bootstrap: [AppComponent]
})

AuthModule:

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        authRouting
    ],
    declarations: [
        AuthComponent,
        LoginComponent,
        SignupComponent,
        LogoutComponent
    ],
    providers: [
        AuthGuard,
        AuthService
    ],
    bootstrap: [ LoginComponent ]
})

TimeModule:

@NgModule({
    declarations: [
        ReadableDatePipe,
        TimeDeltaDirective
    ]
})

And now I am trying to use my TimeDeltaDirective in a view of LoginComponent. And I already tried to add the directive to the other declarations arrays as well, but this won't work either.

I am thankful for any support! Thanks

TimeDeltaDirective:

import { Directive, ElementRef, Input, Renderer } from '@angular/core';

@Directive({ selector: '[time-delta]' })
export class TimeDeltaDirective {
    constructor(renderer: Renderer, el: ElementRef) {
        function getTimeDelta(date: Date) {
            var now = new Date();
            return (now.getTime() - date.getTime()) / 1000;
        }

        this.delta = getTimeDelta(new Date(this.date));
    }

    @Input('date') date: string;
    delta: number;
}

usage in LoginComponent (example):

@Component({
    selector: 'login',
    template: `
    <p date="2016-09-28 00:00:00" [time-delta]>{{delta}}</p>
  `
})

Answer 1

You need to export TimeDeltaDirective from your TimeModule and then import TimeModule in your AuthModule because your LoginComponent is decalred there, and that's where you want to use your directive. This way, TimeDeltaDirective will be available for use in LoginComponent, as well as in other declared components of AuthModule. So, it should be something like this:

AuthModule

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        authRouting,
        TimeModule
    ],
    declarations: [
        AuthComponent,
        LoginComponent,
        SignupComponent,
        LogoutComponent
    ],
    providers: [
        AuthGuard,
        AuthService
    ],
    bootstrap: [ LoginComponent ]
})

TimeModule

@NgModule({
    declarations: [
        ReadableDatePipe,
        TimeDeltaDirective
    ],
    exports: [
        TimeDeltaDirective
    ]
})