angular-docs-cn/modules/@angular/core/test/linker
Miško Hevery d169c2434e feat(core): Add type information to injector.get() (#13785)
- Introduce `InjectionToken<T>` which is a parameterized and type-safe
  version of `OpaqueToken`.

DEPRECATION:
- `OpaqueToken` is now deprecated, use `InjectionToken<T>` instead.
- `Injector.get(token: any, notFoundValue?: any): any` is now deprecated
  use the same method which is now overloaded as
  `Injector.get<T>(token: Type<T>|InjectionToken<T>, notFoundValue?: T): T;`.

Migration
- Replace `OpaqueToken` with `InjectionToken<?>` and parameterize it.
- Migrate your code to only use `Type<?>` or `InjectionToken<?>` as
  injection tokens. Using other tokens will not be supported in the
  future.

BREAKING CHANGE:
- Because `injector.get()` is now parameterize it is possible that code
  which used to work no longer type checks. Example would be if one
  injects `Foo` but configures it as `{provide: Foo, useClass: MockFoo}`.
  The injection instance will be that of `MockFoo` but the type will be
  `Foo` instead of `any` as in the past. This means that it was possible
  to call a method on `MockFoo` in the past which now will fail type
  check. See this example:

```
class Foo {}
class MockFoo extends Foo {
  setupMock();
}

var PROVIDERS = [
  {provide: Foo, useClass: MockFoo}
];

...

function myTest(injector: Injector) {
  var foo = injector.get(Foo);
  // This line used to work since `foo` used to be `any` before this
  // change, it will now be `Foo`, and `Foo` does not have `setUpMock()`.
  // The fix is to downcast: `injector.get(Foo) as MockFoo`.
  foo.setUpMock();
}
```

PR Close #13785
2017-01-17 15:34:54 -06:00
..
animation_view_context_spec.ts perf(animations): always run the animation queue outside of zones 2016-12-14 12:59:36 -08:00
change_detection_integration_spec.ts refactor: format & lint 2016-12-14 13:05:04 -08:00
direct_rendering_integration_spec.ts refactor(test): `<template>`/`<ng-container>`/*-directives 2017-01-09 19:33:38 -05:00
entry_components_integration_spec.ts refactor(): use const and let instead of var 2016-11-12 16:40:17 -08:00
integration_spec.ts feat(core): Add type information to injector.get() (#13785) 2017-01-17 15:34:54 -06:00
ng_container_integration_spec.ts refactor(Compiler): misc cleanup 2017-01-09 19:32:01 -05:00
ng_module_integration_spec.ts feat(core): Add type information to injector.get() (#13785) 2017-01-17 15:34:54 -06:00
projection_integration_spec.ts refactor(): use const and let instead of var 2016-11-12 16:40:17 -08:00
query_integration_spec.ts fix(compiler): query `<template>` elements before their children. (#13677) 2016-12-27 16:28:54 -08:00
query_list_spec.ts refactor(): use const and let instead of var 2016-11-12 16:40:17 -08:00
regression_integration_spec.ts feat(core): Add type information to injector.get() (#13785) 2017-01-17 15:34:54 -06:00
security_integration_spec.ts refactor(): use const and let instead of var 2016-11-12 16:40:17 -08:00
system_ng_module_factory_loader_spec.ts refactor(): use const and let instead of var 2016-11-12 16:40:17 -08:00
view_injector_integration_spec.ts refactor(test): `<template>`/`<ng-container>`/*-directives 2017-01-09 19:33:38 -05:00