diff --git a/package.json b/package.json
index 055e825c60e54..e50c84356ad96 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     "wunit": "npm run wtest",
     "debug-test": "node --inspect-brk test/test.js",
     "test-doclint": "node utils/doclint/check_public_api/test/test.js && node utils/doclint/preprocessor/test.js",
-    "test": "npm run lint --silent && npm run coverage && npm run test-doclint && node utils/testrunner/test/test.js",
+    "test": "npm run lint --silent && npm run ccoverage && npm run fcoverage && npm run wcoverage && npm run test-doclint && node utils/testrunner/test/test.js",
     "prepare": "node prepare.js",
     "lint": "([ \"$CI\" = true ] && eslint --quiet -f codeframe --ext js,ts ./src || eslint --ext js,ts ./src) && npm run tsc && npm run doc",
     "doc": "node utils/doclint/cli.js",
diff --git a/utils/doclint/check_public_api/Documentation.js b/utils/doclint/check_public_api/Documentation.js
index ab640ce59b334..f9a6c66dae188 100644
--- a/utils/doclint/check_public_api/Documentation.js
+++ b/utils/doclint/check_public_api/Documentation.js
@@ -73,7 +73,7 @@ Documentation.Class = class {
     }
   }
 
-  validateOrder(errors) {
+  validateOrder(errors, cls) {
     const members = this.membersArray;
     // Events should go first.
     let eventIndex = 0;
diff --git a/utils/doclint/check_public_api/JSBuilder.js b/utils/doclint/check_public_api/JSBuilder.js
index ee81b9eb8c101..6fc09746982e2 100644
--- a/utils/doclint/check_public_api/JSBuilder.js
+++ b/utils/doclint/check_public_api/JSBuilder.js
@@ -28,7 +28,7 @@ module.exports = { checkSources, expandPrefix };
 function checkSources(sources, externalDependencies) {
   // special treatment for Events.js
   const classEvents = new Map();
-  const eventsSources = sources.filter(source => source.name().startsWith('events.ts'));
+  const eventsSources = sources.filter(source => source.name().startsWith('events.'));
   for (const eventsSource of eventsSources) {
     const {Events} = require(eventsSource.filePath().endsWith('.js') ? eventsSource.filePath() : eventsSource.filePath().replace(/\bsrc\b/, 'lib').replace('.ts', '.js'));
     for (const [className, events] of Object.entries(Events))
diff --git a/utils/doclint/check_public_api/MDBuilder.js b/utils/doclint/check_public_api/MDBuilder.js
index 898c1afc8fc52..0a726d28d1211 100644
--- a/utils/doclint/check_public_api/MDBuilder.js
+++ b/utils/doclint/check_public_api/MDBuilder.js
@@ -306,7 +306,7 @@ module.exports = async function(page, sources) {
 
   // Push base class documentation to derived classes.
   for (const [name, clazz] of documentation.classes.entries()) {
-    clazz.validateOrder(errors);
+    clazz.validateOrder(errors, clazz);
 
     if (!clazz.extends || clazz.extends === 'EventEmitter' || clazz.extends === 'Error')
       continue;
diff --git a/utils/doclint/check_public_api/test/check-duplicates/api.ts b/utils/doclint/check_public_api/test/check-duplicates/api.ts
new file mode 100644
index 0000000000000..66b2b7d80f70e
--- /dev/null
+++ b/utils/doclint/check_public_api/test/check-duplicates/api.ts
@@ -0,0 +1,13 @@
+class Foo {
+  test() {
+  }
+
+  title(arg: number) {
+  }
+}
+
+class Bar {
+}
+
+export {Bar};
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/check-duplicates/foo.js b/utils/doclint/check_public_api/test/check-duplicates/foo.js
deleted file mode 100644
index 640271ae4928a..0000000000000
--- a/utils/doclint/check_public_api/test/check-duplicates/foo.js
+++ /dev/null
@@ -1,13 +0,0 @@
-class Foo {
-  test() {
-  }
-
-  /**
-   * @param {number} arg
-   */
-  title(arg) {
-  }
-}
-
-class Bar {
-}
diff --git a/utils/doclint/check_public_api/test/check-returns/foo.js b/utils/doclint/check_public_api/test/check-returns/api.ts
similarity index 93%
rename from utils/doclint/check_public_api/test/check-returns/foo.js
rename to utils/doclint/check_public_api/test/check-returns/api.ts
index 5833c14699640..b97049ce7e0b8 100644
--- a/utils/doclint/check_public_api/test/check-returns/foo.js
+++ b/utils/doclint/check_public_api/test/check-returns/api.ts
@@ -18,3 +18,5 @@ class Foo {
   async asyncFunction() {
   }
 }
+
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/check-sorting/foo.js b/utils/doclint/check_public_api/test/check-sorting/api.ts
similarity index 55%
rename from utils/doclint/check_public_api/test/check-sorting/foo.js
rename to utils/doclint/check_public_api/test/check-sorting/api.ts
index 9a61bf11a4d98..8bd0913171e21 100644
--- a/utils/doclint/check_public_api/test/check-sorting/foo.js
+++ b/utils/doclint/check_public_api/test/check-sorting/api.ts
@@ -1,7 +1,5 @@
 class Foo {
-  constructor() {
-    this.ddd = 10;
-  }
+  ddd = 10;
 
   aaa() {}
 
@@ -10,3 +8,4 @@ class Foo {
   ccc() {}
 }
 
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/check-sorting/Events.js b/utils/doclint/check_public_api/test/check-sorting/events.js
similarity index 100%
rename from utils/doclint/check_public_api/test/check-sorting/Events.js
rename to utils/doclint/check_public_api/test/check-sorting/events.js
diff --git a/utils/doclint/check_public_api/test/diff-arguments/api.ts b/utils/doclint/check_public_api/test/diff-arguments/api.ts
new file mode 100644
index 0000000000000..35c054db0f32e
--- /dev/null
+++ b/utils/doclint/check_public_api/test/diff-arguments/api.ts
@@ -0,0 +1,11 @@
+class Foo {
+  foo(arg1: string, arg3 = {}) {
+  }
+
+  test(...filePaths : string[]) {
+  }
+
+  bar(options: {visibility?: boolean}) {
+  }
+}
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/diff-arguments/foo.js b/utils/doclint/check_public_api/test/diff-arguments/foo.js
deleted file mode 100644
index d102f6f7ae185..0000000000000
--- a/utils/doclint/check_public_api/test/diff-arguments/foo.js
+++ /dev/null
@@ -1,19 +0,0 @@
-class Foo {
-  /**
-   * @param {string} arg1
-   */
-  foo(arg1, arg3 = {}) {
-  }
-
-  /**
-   * @param  {...string} filePaths
-   */
-  test(...filePaths) {
-  }
-
-  /**
-   * @param {{visibility?: boolean}} options
-   */
-  bar(options) {
-  }
-}
diff --git a/utils/doclint/check_public_api/test/diff-classes/api.ts b/utils/doclint/check_public_api/test/diff-classes/api.ts
new file mode 100644
index 0000000000000..89af0e79615b7
--- /dev/null
+++ b/utils/doclint/check_public_api/test/diff-classes/api.ts
@@ -0,0 +1,2 @@
+export {Foo} from './foo';
+export {Other} from './other';
diff --git a/utils/doclint/check_public_api/test/diff-classes/foo.js b/utils/doclint/check_public_api/test/diff-classes/foo.js
deleted file mode 100644
index f230fa0f41dde..0000000000000
--- a/utils/doclint/check_public_api/test/diff-classes/foo.js
+++ /dev/null
@@ -1,2 +0,0 @@
-class Foo {
-}
diff --git a/utils/doclint/check_public_api/test/diff-classes/foo.ts b/utils/doclint/check_public_api/test/diff-classes/foo.ts
new file mode 100644
index 0000000000000..08c51dd90dbed
--- /dev/null
+++ b/utils/doclint/check_public_api/test/diff-classes/foo.ts
@@ -0,0 +1,2 @@
+export class Foo {
+}
diff --git a/utils/doclint/check_public_api/test/diff-classes/other.js b/utils/doclint/check_public_api/test/diff-classes/other.js
deleted file mode 100644
index 1b94418eb0af4..0000000000000
--- a/utils/doclint/check_public_api/test/diff-classes/other.js
+++ /dev/null
@@ -1,2 +0,0 @@
-class Other {
-}
diff --git a/utils/doclint/check_public_api/test/diff-classes/other.ts b/utils/doclint/check_public_api/test/diff-classes/other.ts
new file mode 100644
index 0000000000000..57e436cf889b8
--- /dev/null
+++ b/utils/doclint/check_public_api/test/diff-classes/other.ts
@@ -0,0 +1,2 @@
+export class Other {
+}
diff --git a/utils/doclint/check_public_api/test/diff-events/foo.js b/utils/doclint/check_public_api/test/diff-events/api.ts
similarity index 53%
rename from utils/doclint/check_public_api/test/diff-events/foo.js
rename to utils/doclint/check_public_api/test/diff-events/api.ts
index fbb14b31366de..8a15f23400107 100644
--- a/utils/doclint/check_public_api/test/diff-events/foo.js
+++ b/utils/doclint/check_public_api/test/diff-events/api.ts
@@ -1,3 +1,4 @@
 class Foo {
 }
 
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/diff-events/Events.js b/utils/doclint/check_public_api/test/diff-events/events.js
similarity index 100%
rename from utils/doclint/check_public_api/test/diff-events/Events.js
rename to utils/doclint/check_public_api/test/diff-events/events.js
diff --git a/utils/doclint/check_public_api/test/diff-methods/foo.js b/utils/doclint/check_public_api/test/diff-methods/api.ts
similarity index 87%
rename from utils/doclint/check_public_api/test/diff-methods/foo.js
rename to utils/doclint/check_public_api/test/diff-methods/api.ts
index 76f44edab7730..3142fc70d2aab 100644
--- a/utils/doclint/check_public_api/test/diff-methods/foo.js
+++ b/utils/doclint/check_public_api/test/diff-methods/api.ts
@@ -14,3 +14,5 @@ class Foo {
   money$$money() {
   }
 }
+
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/diff-properties/api.ts b/utils/doclint/check_public_api/test/diff-properties/api.ts
new file mode 100644
index 0000000000000..40b7cecf89b39
--- /dev/null
+++ b/utils/doclint/check_public_api/test/diff-properties/api.ts
@@ -0,0 +1,5 @@
+class Foo {
+  a = 42;
+  b = 'hello';
+}
+export {Foo};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/diff-properties/foo.js b/utils/doclint/check_public_api/test/diff-properties/foo.js
deleted file mode 100644
index a978379f2cefe..0000000000000
--- a/utils/doclint/check_public_api/test/diff-properties/foo.js
+++ /dev/null
@@ -1,7 +0,0 @@
-class Foo {
-  constructor() {
-    this.a = 42;
-    this.b = 'hello';
-    this.emit('done');
-  }
-}
diff --git a/utils/doclint/check_public_api/test/js-builder-common/foo.js b/utils/doclint/check_public_api/test/js-builder-common/api.ts
similarity index 69%
rename from utils/doclint/check_public_api/test/js-builder-common/foo.js
rename to utils/doclint/check_public_api/test/js-builder-common/api.ts
index cf82646e3c3e9..5251e4fe17c8b 100644
--- a/utils/doclint/check_public_api/test/js-builder-common/foo.js
+++ b/utils/doclint/check_public_api/test/js-builder-common/api.ts
@@ -1,7 +1,7 @@
 class A {
+  property1 = 1;
+  _property2 = 2;
   constructor(delegate) {
-    this.property1 = 1;
-    this._property2 = 2;
   }
 
   get getter() {
@@ -11,3 +11,5 @@ class A {
   async method(foo, bar) {
   }
 }
+
+export {A};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/js-builder-common/Events.js b/utils/doclint/check_public_api/test/js-builder-common/events.js
similarity index 100%
rename from utils/doclint/check_public_api/test/js-builder-common/Events.js
rename to utils/doclint/check_public_api/test/js-builder-common/events.js
diff --git a/utils/doclint/check_public_api/test/js-builder-inheritance/foo.js b/utils/doclint/check_public_api/test/js-builder-inheritance/api.ts
similarity index 82%
rename from utils/doclint/check_public_api/test/js-builder-inheritance/foo.js
rename to utils/doclint/check_public_api/test/js-builder-inheritance/api.ts
index 1d5cb154d48e3..914588a0f71fd 100644
--- a/utils/doclint/check_public_api/test/js-builder-inheritance/foo.js
+++ b/utils/doclint/check_public_api/test/js-builder-inheritance/api.ts
@@ -13,3 +13,6 @@ class B extends A {
   bar(override) {
   }
 }
+
+export {A};
+export {B};
\ No newline at end of file
diff --git a/utils/doclint/check_public_api/test/js-builder-inheritance/Events.js b/utils/doclint/check_public_api/test/js-builder-inheritance/events.js
similarity index 100%
rename from utils/doclint/check_public_api/test/js-builder-inheritance/Events.js
rename to utils/doclint/check_public_api/test/js-builder-inheritance/events.js
diff --git a/utils/doclint/check_public_api/test/test.js b/utils/doclint/check_public_api/test/test.js
index 269da71f5dadc..cdf7663d7e6fb 100644
--- a/utils/doclint/check_public_api/test/test.js
+++ b/utils/doclint/check_public_api/test/test.js
@@ -34,7 +34,7 @@ let browserContext;
 let page;
 
 beforeAll(async function() {
-  browser = await playwright.launch();
+  browser = await playwright.chromium.launch();
   page = await browser.newPage();
 });
 
@@ -65,8 +65,9 @@ async function testLint(state, test) {
   });
 
   const mdSources = await Source.readdir(dirPath, '.md');
+  const tsSources = await Source.readdir(dirPath, '.ts');
   const jsSources = await Source.readdir(dirPath, '.js');
-  const messages = await checkPublicAPI(page, mdSources, jsSources);
+  const messages = await checkPublicAPI(page, mdSources, jsSources.concat(tsSources));
   const errors = messages.map(message => message.text);
   expect(errors.join('\n')).toBeGolden('result.txt');
 }
@@ -86,8 +87,9 @@ async function testJSBuilder(state, test) {
   const {expect} = new Matchers({
     toBeGolden: GoldenUtils.compare.bind(null, dirPath, dirPath)
   });
-  const sources = await Source.readdir(dirPath, '.js');
-  const {documentation} = await jsBuilder(sources);
+  const jsSources = await Source.readdir(dirPath, '.js');
+  const tsSources = await Source.readdir(dirPath, '.ts');
+  const {documentation} = await jsBuilder.checkSources(jsSources.concat(tsSources));
   expect(serialize(documentation)).toBeGolden('result.txt');
 }