Docs4dev
Docs
angular / 14 / api / core / environmentinjector.html

EnvironmentInjector

class developer preview

An Injector that's part of the environment injector hierarchy, which exists outside of the component tree.

abstract class EnvironmentInjector implements Injector {
  abstract get<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): T
  abstract runInContext<ReturnT>(fn: () => ReturnT): ReturnT
  abstract destroy(): void
}

Methods

get()

Retrieves an instance from the injector based on the provided token.

abstract get<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): T

Parameters
token ProviderToken<T>
notFoundValue T

Optional. Default is undefined.
flags InjectFlags

Optional. Default is undefined.
Returns

T: The instance from the injector if defined, otherwise the notFoundValue.

Throws

Error When the notFoundValue is undefined or Injector.THROW_IF_NOT_FOUND.

abstract get(token: any, notFoundValue?: any): any

Deprecated from v4.0.0 use ProviderToken

Parameters
token any
notFoundValue any

Optional. Default is undefined.
Returns

any
runInContext()

Runs the given function in the context of this EnvironmentInjector.

abstract runInContext<ReturnT>(fn: () => ReturnT): ReturnT

Parameters
fn () => ReturnT

the closure to be run in the context of this injector
Returns

ReturnT: the return value of the function, if any

Within the function's stack frame, inject can be used to inject dependencies from this injector. Note that inject is only usable synchronously, and cannot be used in any asynchronous callbacks or after any await points.
destroy()

abstract destroy(): void

Parameters

There are no parameters.

Returns

void

© 2010–2023 Google, Inc.
Licensed under the Creative Commons Attribution License 4.0.
https://v14.angular.io/api/core/EnvironmentInjector