7dd0db6d4f
This commit adds the `AstHost` interface, along with implementations for both Babel and TS. It also implements the Babel vesion of the `AstFactory` interface, along with a linker specific implementation of the `ImportGenerator` interface. These classes will be used by the new "ng-linker" to transform prelinked library code using a Babel plugin. PR Close #38866
38 lines
1.3 KiB
TypeScript
38 lines
1.3 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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/**
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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 Error(`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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