feat: support dynamic imports

lib/util/removeUnusedExport.test.ts

@@ -803,6 +803,28 @@ const b: B = {};`,
     );
   });
 
+  describe('dynamic import', () => {
+    it('should not remove export if its used in dynamic import', () => {
+      const { languageService, fileService } = setup();
+      fileService.set(
+        '/app/main.ts',
+        `import('./a.js');
+import('./b.js');`,
+      );
+      fileService.set('/app/a.ts', `export const a = 'a';`);
+      fileService.set('/app/b.ts', `export default 'b';`);
+
+      removeUnusedExport({
+        languageService,
+        fileService,
+        targetFile: ['/app/a.ts', '/app/b.ts'],
+      });
+
+      assert.equal(fileService.get('/app/a.ts'), `export const a = 'a';`);
+      assert.equal(fileService.get('/app/b.ts'), `export default 'b';`);
+    });
+  });
+
   describe('deleteUnusedFile', () => {
     it('should not remove file if some exports are used in other files', () => {
       const { languageService, fileService } = setup();

lib/util/removeUnusedExport.ts

@@ -8,6 +8,7 @@ import {
 } from './applyCodeFix.js';
 import { EditTracker } from './EditTracker.js';
 import { getFileFromModuleSpecifierText } from './getFileFromModuleSpecifierText.js';
+import { collectDynamicImports } from './collectDynamicImports.js';
 
 const findFirstNodeOfKind = (root: ts.Node, kind: ts.SyntaxKind) => {
   let result: ts.Node | undefined;
@@ -527,6 +528,8 @@ export const removeUnusedExport = ({
     throw new Error('program not found');
   }
 
+  const dynamicImports = collectDynamicImports({ program, fileService });
+
   for (const file of Array.isArray(targetFile) ? targetFile : [targetFile]) {
     const sourceFile = program.getSourceFile(file);
 
@@ -536,6 +539,13 @@ export const removeUnusedExport = ({
 
     editTracker.start(file, sourceFile.getFullText());
 
+    const dynamicImport = dynamicImports.vertexes.get(file);
+
+    if (dynamicImport && dynamicImport.from.size > 0) {
+      editTracker.end(file);
+      continue;
+    }
+
     let content = fileService.get(file);
     let isUsed = false;
 
@@ -562,6 +572,7 @@ export const removeUnusedExport = ({
     if (!isUsed && deleteUnusedFile) {
       fileService.delete(file);
       editTracker.delete(file);
+      dynamicImports.deleteVertex(file);
 
       continue;
     }