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https://github.com/angular/angular
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f6da091228
Adds the necessary compiler changes to support input transform functions. The compiler output has changed in the following ways:
### Directive handler
The directive handler now extracts a reference to the input transform function and it resolves the type of its first parameter. It also asserts that the type can be referenced in the compiled output and that it doesn't clash with any pre-existing `ngAcceptInputType_` members.
### .d.ts
In the generated declaration files the compiler now inserts an `ngAcceptInputType_` member for each input with a `transform` function. The member's type corresponds to the type of the first parameter of the function, e.g.
```typescript
// foo.directive.ts
@Directive()
export class Foo {
@Input({transform: (incomingValue: string) => parseInt(incomingValue)}) value: number;
}
// foo.directive.d.ts
export class Foo {
value: number;
static ngAcceptInputType_value: string;
}
```
### Type check block
If an input has `transform` function, the TCB will use the type of its first parameter for the setter type. This uses the same infrastructure as the `ngAcceptInputType_` members.
### Directive declaration
The generated runtime directive declaration call now includes the `transform` function in the `inputs` map, if the input is being transformed. The function will be picked up by the runtime in the next commit to do the actual transformation.
```typescript
// foo.directive.ts
@Directive()
export class Foo {
@Input({transform: (incomingValue: string) => parseInt(incomingValue)}) value: number;
}
// foo.directive.js
export class Foo {
ɵdir = ɵɵdefineDirective({
inputs: {
value: ['value', 'value', incomingValue => parseInt(incomingValue)]
}
});
}
```
PR Close #50225
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| .. | ||
| BUILD.bazel | ||
| component_indexing_spec.ts | ||
| env.ts | ||
| extended_template_diagnostics_spec.ts | ||
| host_directives_spec.ts | ||
| imports_spec.ts | ||
| incremental_error_spec.ts | ||
| incremental_semantic_changes_spec.ts | ||
| incremental_spec.ts | ||
| incremental_typecheck_spec.ts | ||
| ls_typecheck_helpers_spec.ts | ||
| monorepo_spec.ts | ||
| ngtsc_spec.ts | ||
| scope_spec.ts | ||
| sourcemap_utils.ts | ||
| standalone_spec.ts | ||
| template_mapping_spec.ts | ||
| template_typecheck_spec.ts | ||
| util.ts | ||
| xi18n_spec.ts | ||