7e742aea7c
This commit adds the basic building blocks for linking partial declarations.
In particular it provides a generic `FileLinker` class that delegates to
a set of (not yet implemented) `PartialLinker` classes.
The Babel plugin makes use of this `FileLinker` providing concrete classes
for `AstHost` and `AstFactory` that work with Babel AST. It can be created
with the following code:
```ts
const plugin = createEs2015LinkerPlugin({ /* options */ });
```
PR Close #39116
39 lines
1.4 KiB
TypeScript
39 lines
1.4 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {ImportGenerator, NamedImport} from '../../src/ngtsc/translator';
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import {FatalLinkerError} from './fatal_linker_error';
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/**
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* A class that is used to generate imports when translating from Angular Output AST to an AST to
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* render, such as Babel.
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*
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* Note that, in the linker, there can only be imports from `@angular/core` and that these imports
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* must be achieved by property access on an `ng` namespace identifer, which is passed in via the
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* constructor.
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*/
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export class LinkerImportGenerator<TExpression> implements ImportGenerator<TExpression> {
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constructor(private ngImport: TExpression) {}
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generateNamespaceImport(moduleName: string): TExpression {
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this.assertModuleName(moduleName);
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return this.ngImport;
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}
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generateNamedImport(moduleName: string, originalSymbol: string): NamedImport<TExpression> {
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this.assertModuleName(moduleName);
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return {moduleImport: this.ngImport, symbol: originalSymbol};
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}
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private assertModuleName(moduleName: string): void {
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if (moduleName !== '@angular/core') {
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throw new FatalLinkerError(
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this.ngImport, `Unable to import from anything other than '@angular/core'`);
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}
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}
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}
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