angular-docs-cn/modules/@angular/compiler
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
..
src feat(core): Add type information to injector.get() (#13785) 2017-01-17 15:34:54 -06:00
test fix(i18n): translate attributes inside elements marked for translation 2017-01-09 19:33:03 -05:00
testing fix(i18n): parse ICU messages while normalizing templates 2016-12-27 15:32:43 -08:00
index.ts refactor(compiler): don't print stack trace on template parse errors (#13390) 2016-12-15 13:07:12 -08:00
package.json docs: update descriptions in package.jsons 2016-09-14 16:44:39 -07:00
rollup-testing.config.js refactor: add license header to JS files & format files (#12081) 2016-10-04 20:39:20 -07:00
rollup.config.js refactor: add license header to JS files & format files (#12081) 2016-10-04 20:39:20 -07:00
tsconfig-build.json feature(tsc-wrapped): add option for closure compiler JSDoc annotations 2016-11-18 09:37:40 -08:00
tsconfig-testing.json fix(packages): use ES modules for primary build (#11120) 2016-08-30 18:07:40 -07:00