refactor: move ts-circular-dependencies tool to dev-infra (#35647)

PR Close #35647

dev-infra/ts-circular-dependencies/parser.ts

@@ -0,0 +1,27 @@
+/**
+ * @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;
+}