feat(material/schematics): create updateModuleSpecifier ts migration …

…fn (#25128)

* move Update and writeUpdate to new file
  to avoid circular deps

src/material/schematics/migration-utilities/BUILD.bazel

@@ -8,7 +8,9 @@ ts_library(
         ["**/*.ts"],
         exclude = ["**/*.spec.ts"],
     ),
-    deps = [],
+    deps = [
+        "@npm//typescript",
+    ],
 )
 
 ts_library(
@@ -18,6 +20,7 @@ ts_library(
     deps = [
         ":migration-utilities",
         "@npm//@types/jasmine",
+        "@npm//typescript",
     ],
 )
 

src/material/schematics/migration-utilities/index.ts

@@ -6,18 +6,5 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-/** Stores the data needed to make a single update to a file. */
-export interface Update {
-  /** The start index of the location of the update. */
-  offset: number;
-
-  /** A function to be used to update the file content. */
-  updateFn: (html: string) => string;
-}
-
-/** Applies the updates to the given file content in reverse offset order. */
-export function writeUpdates(content: string, updates: Update[]): string {
-  updates.sort((a, b) => b.offset - a.offset);
-  updates.forEach(update => (content = update.updateFn(content)));
-  return content;
-}
+export {updateModuleSpecifier} from './typescript/import-operations';
+export {Update, writeUpdates} from './update';

src/material/schematics/migration-utilities/typescript/import-operations.spec.ts

@@ -0,0 +1,67 @@
+import * as ts from 'typescript';
+import {updateModuleSpecifier} from './import-operations';
+
+describe('import operations', () => {
+  describe('updateModuleSpecifier', () => {
+    function runUpdateModuleSpecifierTest(
+      description: string,
+      opts: {old: string; new: string},
+    ): void {
+      const node = createNode(opts.old, ts.SyntaxKind.ImportDeclaration) as ts.ImportDeclaration;
+      const update = updateModuleSpecifier(node!, {moduleSpecifier: 'new-module-name'});
+      const newImport = update?.updateFn(opts.old);
+      expect(newImport).withContext(description).toBe(opts.new);
+    }
+    it('updates the module specifier of import declarations', () => {
+      runUpdateModuleSpecifierTest('default export', {
+        old: `import defaultExport from 'old-module-name';`,
+        new: `import defaultExport from 'new-module-name';`,
+      });
+      runUpdateModuleSpecifierTest('namespace import', {
+        old: `import * as name from 'old-module-name';`,
+        new: `import * as name from 'new-module-name';`,
+      });
+      runUpdateModuleSpecifierTest('named import', {
+        old: `import { export1 } from 'old-module-name';`,
+        new: `import { export1 } from 'new-module-name';`,
+      });
+      runUpdateModuleSpecifierTest('aliased named import', {
+        old: `import { export1 as alias1 } from 'old-module-name';`,
+        new: `import { export1 as alias1 } from 'new-module-name';`,
+      });
+      runUpdateModuleSpecifierTest('multiple named import', {
+        old: `import { export1, export2 } from 'old-module-name';`,
+        new: `import { export1, export2 } from 'new-module-name';`,
+      });
+      runUpdateModuleSpecifierTest('multiple named import w/ alias', {
+        old: `import { export1, export2 as alias2 } from 'old-module-name';`,
+        new: `import { export1, export2 as alias2 } from 'new-module-name';`,
+      });
+    });
+  });
+});
+
+function createSourceFile(text: string): ts.SourceFile {
+  return ts.createSourceFile('file.ts', text, ts.ScriptTarget.Latest);
+}
+
+function visitNodes(node: ts.SourceFile | ts.Node, visitFn: (node: ts.Node) => void): void {
+  node.forEachChild(child => {
+    visitFn(child);
+    visitNodes(child, visitFn);
+  });
+}
+
+function getNodeByKind(file: ts.SourceFile, kind: ts.SyntaxKind): ts.Node | null {
+  let node: ts.Node | null = null;
+  visitNodes(file, (_node: ts.Node) => {
+    if (_node.kind === kind) {
+      node = _node;
+    }
+  });
+  return node;
+}
+
+function createNode(text: string, kind: ts.SyntaxKind): ts.Node | null {
+  return getNodeByKind(createSourceFile(text), kind);
+}

src/material/schematics/migration-utilities/typescript/import-operations.ts

@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright Google LLC 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 {Update} from '../update';
+import * as ts from 'typescript';
+
+/** Returns an Update that renames the module specifier of the given import declaration node. */
+export function updateModuleSpecifier(
+  node: ts.ImportDeclaration,
+  opts: {
+    moduleSpecifier: string;
+  },
+): Update {
+  const moduleSpecifier = node.moduleSpecifier as ts.StringLiteral;
+  return {
+    offset: moduleSpecifier.pos,
+    updateFn: (text: string) => {
+      const index = text.indexOf(moduleSpecifier.text, moduleSpecifier.pos);
+      return (
+        text.slice(0, index) +
+        opts.moduleSpecifier +
+        text.slice(index + moduleSpecifier.text.length)
+      );
+    },
+  };
+}

src/material/schematics/migration-utilities/update.ts

@@ -0,0 +1,23 @@
+/**
+ * @license
+ * Copyright Google LLC 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
+ */
+
+/** Stores the data needed to make a single update to a file. */
+export interface Update {
+  /** The start index of the location of the update. */
+  offset: number;
+
+  /** A function to be used to update the file content. */
+  updateFn: (text: string) => string;
+}
+
+/** Applies the updates to the given file content in reverse offset order. */
+export function writeUpdates(content: string, updates: Update[]): string {
+  updates.sort((a, b) => b.offset - a.offset);
+  updates.forEach(update => (content = update.updateFn(content)));
+  return content;
+}