angular-docs-cn/packages/compiler-cli/test
Alex Rickabaugh 4055150910 feat(compiler): allow selector-less directives as base classes (#31379)
In Angular today, the following pattern works:

```typescript
export class BaseDir {
  constructor(@Inject(ViewContainerRef) protected vcr: ViewContainerRef) {}
}

@Directive({
  selector: '[child]',
})
export class ChildDir extends BaseDir {
  // constructor inherited from BaseDir
}
```

A decorated child class can inherit a constructor from an undecorated base
class, so long as the base class has metadata of its own (for JIT mode).
This pattern works regardless of metadata in AOT.

In Angular Ivy, this pattern does not work: without the @Directive
annotation identifying the base class as a directive, information about its
constructor parameters will not be captured by the Ivy compiler. This is a
result of Ivy's locality principle, which is the basis behind a number of
compilation optimizations.

As a solution, @Directive() without a selector will be interpreted as a
"directive base class" annotation. Such a directive cannot be declared in an
NgModule, but can be inherited from. To implement this, a few changes are
made to the ngc compiler:

* the error for a selector-less directive is now generated when an NgModule
  declaring it is processed, not when the directive itself is processed.
* selector-less directives are not tracked along with other directives in
  the compiler, preventing other errors (like their absence in an NgModule)
  from being generated from them.

PR Close #31379
2019-08-14 12:03:05 -07:00
..
compliance refactor(ivy): combine query load instructions (#32100) 2019-08-12 10:32:08 -07:00
diagnostics fix(language-service): Remove 'context' used for module resolution (#32015) 2019-08-13 11:19:18 -07:00
helpers fix(ivy): handle namespaced imports correctly (#31367) 2019-07-09 09:40:30 -07:00
metadata build: TypeScript 3.5 upgrade (#31615) 2019-07-25 17:05:23 -07:00
ngtsc fix(ivy): reuse compilation scope for incremental template changes. (#31932) 2019-08-09 10:50:40 -07:00
transformers refactor: fix typescript strict flag failures in all tests (#30993) 2019-07-18 14:21:26 -07:00
BUILD.bazel refactor(ivy): implement a virtual file-system layer in ngtsc + ngcc (#30921) 2019-06-25 16:25:24 -07:00
extract_i18n_spec.ts refactor(ivy): implement a virtual file-system layer in ngtsc + ngcc (#30921) 2019-06-25 16:25:24 -07:00
mocks.ts fix(compiler-cli): Use typescript to resolve modules for metadata (#22856) 2018-07-10 11:11:48 -07:00
ngc_spec.ts feat(compiler): allow selector-less directives as base classes (#31379) 2019-08-14 12:03:05 -07:00
ngtools_api_spec.ts fix(ivy): DebugNode.query should query nodes in the logical tree (#29480) 2019-03-26 12:48:37 -07:00
perform_compile_spec.ts feat(compiler-cli): add support to extend `angularCompilerOptions` (#22717) 2018-09-19 16:17:28 -07:00
perform_watch_spec.ts fix(compiler-cli): Return original sourceFile instead of redirected sourceFile from getSourceFile (#26036) 2019-07-15 17:33:40 -04:00
test_support.ts refactor(ivy): implement a virtual file-system layer in ngtsc + ngcc (#30921) 2019-06-25 16:25:24 -07:00