angular-docs-cn/dev-infra/ts-circular-dependencies/parser.ts

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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as ts from 'typescript';
/**
* Finds all module references in the specified source file.
* @param node Source file which should be parsed.
* @returns List of import specifiers in the source file.
*/
export function getModuleReferences(node: ts.SourceFile): string[] {
const references: string[] = [];
const visitNode = (node: ts.Node) => {
if ((ts.isImportDeclaration(node) || ts.isExportDeclaration(node)) &&
node.moduleSpecifier !== undefined && ts.isStringLiteral(node.moduleSpecifier)) {
references.push(node.moduleSpecifier.text);
}
ts.forEachChild(node, visitNode);
};
ts.forEachChild(node, visitNode);
return references;
}