ValueProvider

Stable Interface

What it does

Configures the Injector to return a value for a token.

How to use

const provider: ValueProvider = {provide: 'someToken', useValue: 'someValue'};

Interface Overview

interface ValueProvider {
  provide : any
  useValue : any
  multi : boolean
}

Interface Description

For more details, see the Dependency Injection Guide.

Example

const injector =
    ReflectiveInjector.resolveAndCreate([{provide: String, useValue: 'Hello'}]);

expect(injector.get(String)).toEqual('Hello');

Interface Details

provide : any

An injection token. (Typically an instance of Type or OpaqueToken, but can be any).

useValue : any

The value to inject.

multi : boolean

If true, than injector returns an array of instances. This is useful to allow multiple providers spread across many files to provide configuration information to a common token.

const injector = ReflectiveInjector.resolveAndCreate([
  {provide: 'local', multi: true, useValue: 'en'},
  {provide: 'local', multi: true, useValue: 'sk'},
]);

const locales: string[] = injector.get('local');
expect(locales).toEqual(['en', 'sk']);

exported from @angular/core/index, defined in @angular/core/src/di/provider.ts

Links:

https://angular.io/docs/ts/latest/api/core/index/ValueProvider-interface.html

doc_Angular

2025-01-10 15:47:30

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