test: add test cases to cover other export variations

lib/util/removeUnusedExport.test.ts

@@ -615,7 +615,7 @@ export { remain };`,
   });
 
   describe('locally used declaration but not used in any other file', () => {
-    it('should remove export keyword if its not used in any other file', () => {
+    it('should remove export keyword of variable if its not used in any other file', () => {
       const { languageService, fileService } = setup();
       fileService.set('/app/main.ts', `import { a } from './a';`);
 
@@ -639,6 +639,106 @@ const b = 'b';
 console.log(b);`,
       );
     });
+
+    it('should remove export keyword of class declaration if its not used in any other file', () => {
+      const { languageService, fileService } = setup();
+      fileService.set('/app/main.ts', `import { a } from './a';`);
+
+      fileService.set(
+        '/app/a.ts',
+        `export const a = 'a';
+export class B {}
+console.log(B);`,
+      );
+
+      removeUnusedExport({
+        languageService,
+        fileService,
+        targetFile: '/app/a.ts',
+      });
+
+      assert.equal(
+        fileService.get('/app/a.ts').trim(),
+        `export const a = 'a';
+class B {}
+console.log(B);`,
+      );
+    });
+
+    it('should remove export keyword of interface declaration if its not used in any other file', () => {
+      const { languageService, fileService } = setup();
+      fileService.set('/app/main.ts', `import { a } from './a';`);
+
+      fileService.set(
+        '/app/a.ts',
+        `export const a = 'a';
+export interface B {}
+const b: B = {};`,
+      );
+
+      removeUnusedExport({
+        languageService,
+        fileService,
+        targetFile: '/app/a.ts',
+      });
+
+      assert.equal(
+        fileService.get('/app/a.ts').trim(),
+        `export const a = 'a';
+interface B {}
+const b: B = {};`,
+      );
+    });
+  });
+
+  it('should remove export keyword of type alias declaration if its not used in any other file', () => {
+    const { languageService, fileService } = setup();
+    fileService.set('/app/main.ts', `import { a } from './a';`);
+
+    fileService.set(
+      '/app/a.ts',
+      `export const a = 'a';
+export type B = 'b';
+const b: B = 'b';`,
+    );
+
+    removeUnusedExport({
+      languageService,
+      fileService,
+      targetFile: '/app/a.ts',
+    });
+
+    assert.equal(
+      fileService.get('/app/a.ts').trim(),
+      `export const a = 'a';
+type B = 'b';
+const b: B = 'b';`,
+    );
+  });
+
+  it('should remove export keyword of interface declaration if its not used in any other file', () => {
+    const { languageService, fileService } = setup();
+    fileService.set('/app/main.ts', `import { a } from './a';`);
+
+    fileService.set(
+      '/app/a.ts',
+      `export const a = 'a';
+export interface B {}
+const b: B = {};`,
+    );
+
+    removeUnusedExport({
+      languageService,
+      fileService,
+      targetFile: '/app/a.ts',
+    });
+
+    assert.equal(
+      fileService.get('/app/a.ts').trim(),
+      `export const a = 'a';
+interface B {}
+const b: B = {};`,
+    );
   });
 
   describe('deleteUnusedFile', () => {