838902556b
The various dependency hosts had a lot of duplicated code. This commit refactors them to move this into the base class. PR Close #37075
42 lines
1.3 KiB
TypeScript
42 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 * as ts from 'typescript';
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import {AbsoluteFsPath} from '../../../src/ngtsc/file_system';
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import {getImportsOfUmdModule, parseStatementForUmdModule} from '../host/umd_host';
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import {hasRequireCalls} from './commonjs_dependency_host';
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import {DependencyHostBase} from './dependency_host';
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/**
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* Helper functions for computing dependencies.
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*/
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export class UmdDependencyHost extends DependencyHostBase {
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protected canSkipFile(fileContents: string): boolean {
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return !hasRequireCalls(fileContents);
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}
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protected extractImports(file: AbsoluteFsPath, fileContents: string): Set<string> {
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// Parse the source into a TypeScript AST and then walk it looking for imports and re-exports.
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const sf =
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ts.createSourceFile(file, fileContents, ts.ScriptTarget.ES2015, false, ts.ScriptKind.JS);
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if (sf.statements.length !== 1) {
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return new Set();
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}
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const umdModule = parseStatementForUmdModule(sf.statements[0]);
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const umdImports = umdModule && getImportsOfUmdModule(umdModule);
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if (umdImports === null) {
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return new Set();
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}
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return new Set(umdImports.map(i => i.path));
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}
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}
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