chore: strengthen linting (#29669)

.eslintrc-with-ts-config.js

@@ -0,0 +1,15 @@
+module.exports = {
+  extends: "./.eslintrc.js",
+  parserOptions: {
+    ecmaVersion: 9,
+    sourceType: "module",
+    project: "./tsconfig.json",
+  },
+  rules: {
+    "@typescript-eslint/no-base-to-string": "error",
+    "@typescript-eslint/no-unnecessary-boolean-literal-compare": 2,
+  },
+  parserOptions: {
+    project: "./tsconfig.json"
+  },
+};

.eslintrc.js

@@ -4,7 +4,6 @@ module.exports = {
     parserOptions: {
       ecmaVersion: 9,
       sourceType: "module",
-      project: "./tsconfig.json",
     },
     extends: [
       "plugin:react-hooks/recommended"
@@ -49,6 +48,7 @@ module.exports = {
         "arrow-parens": [2, "as-needed"],
         "prefer-const": 2,
         "quote-props": [2, "consistent"],
+        "nonblock-statement-body-position": [2, "below"],
 
         // anti-patterns
         "no-var": 2,

docs/src/service-workers-experimental-network-events-js.md

@@ -137,10 +137,12 @@ self.addEventListener('fetch', event => {
       (async () => {
         // 1. Try to first serve directly from caches
         const response = await caches.match(event.request);
-        if (response) return response;
+        if (response)
+          return response;
 
         // 2. Re-write request for /foo to /bar
-        if (event.request.url.endsWith('foo')) return fetch('./bar');
+        if (event.request.url.endsWith('foo'))
+          return fetch('./bar');
 
         // 3. Prevent tracker.js from being retrieved, and returns a placeholder response
         if (event.request.url.endsWith('tracker.js')) {

packages/.eslintrc-with-ts-config.js

@@ -1,9 +0,0 @@
-module.exports = {
-  extends: ".eslintrc.js",
-  rules: {
-    "@typescript-eslint/no-base-to-string": "error",
-  },
-  parserOptions: {
-    project: "./tsconfig.json"
-  },
-};

packages/playwright-core/.eslintrc.js

@@ -1,3 +1,3 @@
 module.exports = {
-  extends: "../.eslintrc-with-ts-config.js",
+  extends: "../../.eslintrc-with-ts-config.js",
 };

packages/playwright-core/src/client/browserContext.ts

@@ -526,7 +526,7 @@ export async function prepareBrowserContextParams(options: BrowserContextOptions
 function toAcceptDownloadsProtocol(acceptDownloads?: boolean) {
   if (acceptDownloads === undefined)
     return undefined;
-  if (acceptDownloads === true)
+  if (acceptDownloads)
     return 'accept';
   return 'deny';
 }

packages/playwright-core/src/server/chromium/crBrowser.ts

@@ -594,7 +594,8 @@ export class CRBrowserContext extends BrowserContext {
       targetId = (page._delegate as CRPage)._targetId;
     } else if (page instanceof Frame) {
       const session = (page._page._delegate as CRPage)._sessions.get(page._id);
-      if (!session) throw new Error(`This frame does not have a separate CDP session, it is a part of the parent frame's session`);
+      if (!session)
+        throw new Error(`This frame does not have a separate CDP session, it is a part of the parent frame's session`);
       targetId = session._targetId;
     } else {
       throw new Error('page: expected Page or Frame');

packages/playwright-core/src/server/injected/vueSelectorEngine.ts

@@ -86,12 +86,18 @@ function buildComponentsTreeVue3(instance: VueVNode): ComponentNode {
   // @see https://github.com/vuejs/devtools/blob/e7132f3392b975e39e1d9a23cf30456c270099c2/packages/app-backend-vue3/src/components/util.ts#L29
   function getInstanceName(instance: VueVNode): string {
     const name = getComponentTypeName(instance.type || {});
-    if (name) return name;
+    if (name)
-    if (instance.root === instance) return 'Root';
+      return name;
-    for (const key in instance.parent?.type?.components)
+    if (instance.root === instance)
-      if (instance.parent?.type.components[key] === instance.type) return saveComponentName(instance, key);
+      return 'Root';
-    for (const key in instance.appContext?.components)
+    for (const key in instance.parent?.type?.components) {
-      if (instance.appContext.components[key] === instance.type) return saveComponentName(instance, key);
+      if (instance.parent?.type.components[key] === instance.type)
+        return saveComponentName(instance, key);
+    }
+    for (const key in instance.appContext?.components) {
+      if (instance.appContext.components[key] === instance.type)
+        return saveComponentName(instance, key);
+    }
     return 'Anonymous Component';
   }
 
@@ -132,7 +138,8 @@ function buildComponentsTreeVue3(instance: VueVNode): ComponentNode {
 
   // @see https://github.com/vuejs/devtools/blob/e7132f3392b975e39e1d9a23cf30456c270099c2/packages/app-backend-vue3/src/components/el.ts#L15
   function getFragmentRootElements(vnode: any): Element[] {
-    if (!vnode.children) return [];
+    if (!vnode.children)
+      return [];
 
     const list = [];
 

packages/playwright-core/src/utils/isomorphic/cssTokenizer.ts

@@ -48,8 +48,10 @@ function preprocess(str: string): number[] {
     if (code === 0xd && str.charCodeAt(i + 1) === 0xa) {
       code = 0xa; i++;
     }
-    if (code === 0xd || code === 0xc) code = 0xa;
+    if (code === 0xd || code === 0xc)
-    if (code === 0x0) code = 0xfffd;
+      code = 0xa;
+    if (code === 0x0)
+      code = 0xfffd;
     if (between(code, 0xd800, 0xdbff) && between(str.charCodeAt(i + 1), 0xdc00, 0xdfff)) {
       // Decode a surrogate pair into an astral codepoint.
       const lead = code - 0xd800;
@@ -63,7 +65,8 @@ function preprocess(str: string): number[] {
 }
 
 function stringFromCode(code: number) {
-  if (code <= 0xffff) return String.fromCharCode(code);
+  if (code <= 0xffff)
+    return String.fromCharCode(code);
   // Otherwise, encode astral char as surrogate pair.
   code -= Math.pow(2, 16);
   const lead = Math.floor(code / Math.pow(2, 10)) + 0xd800;
@@ -107,8 +110,10 @@ export function tokenize(str1: string): CSSTokenInterface[] {
       num = 1;
     i += num;
     code = codepoint(i);
-    if (newline(code)) incrLineno();
+    if (newline(code))
-    else column += num;
+      incrLineno();
+    else
+      column += num;
     // console.log('Consume '+i+' '+String.fromCharCode(code) + ' 0x' + code.toString(16));
     return true;
   };
@@ -125,7 +130,8 @@ export function tokenize(str1: string): CSSTokenInterface[] {
     return true;
   };
   const eof = function(codepoint?: number): boolean {
-    if (codepoint === undefined) codepoint = code;
+    if (codepoint === undefined)
+      codepoint = code;
     return codepoint === -1;
   };
   const donothing = function() { };
@@ -138,12 +144,14 @@ export function tokenize(str1: string): CSSTokenInterface[] {
     consumeComments();
     consume();
     if (whitespace(code)) {
-      while (whitespace(next())) consume();
+      while (whitespace(next()))
+        consume();
       return new WhitespaceToken();
     } else if (code === 0x22) {return consumeAStringToken();} else if (code === 0x23) {
       if (namechar(next()) || areAValidEscape(next(1), next(2))) {
         const token = new HashToken('');
-        if (wouldStartAnIdentifier(next(1), next(2), next(3))) token.type = 'id';
+        if (wouldStartAnIdentifier(next(1), next(2), next(3)))
+          token.type = 'id';
         token.value = consumeAName();
         return token;
       } else {
@@ -288,7 +296,8 @@ export function tokenize(str1: string): CSSTokenInterface[] {
     const str = consumeAName();
     if (str.toLowerCase() === 'url' && next() === 0x28) {
       consume();
-      while (whitespace(next(1)) && whitespace(next(2))) consume();
+      while (whitespace(next(1)) && whitespace(next(2)))
+        consume();
       if (next() === 0x22 || next() === 0x27)
         return new FunctionToken(str);
       else if (whitespace(next()) && (next(2) === 0x22 || next(2) === 0x27))
@@ -305,7 +314,8 @@ export function tokenize(str1: string): CSSTokenInterface[] {
   };
 
   const consumeAStringToken = function(endingCodePoint?: number): CSSParserToken {
-    if (endingCodePoint === undefined) endingCodePoint = code;
+    if (endingCodePoint === undefined)
+      endingCodePoint = code;
     let string = '';
     while (consume()) {
       if (code === endingCodePoint || eof()) {
@@ -331,13 +341,16 @@ export function tokenize(str1: string): CSSTokenInterface[] {
 
   const consumeAURLToken = function(): CSSTokenInterface {
     const token = new URLToken('');
-    while (whitespace(next())) consume();
+    while (whitespace(next()))
-    if (eof(next())) return token;
+      consume();
+    if (eof(next()))
+      return token;
     while (consume()) {
       if (code === 0x29 || eof()) {
         return token;
       } else if (whitespace(code)) {
-        while (whitespace(next())) consume();
+        while (whitespace(next()))
+          consume();
         if (next() === 0x29 || eof(next())) {
           consume();
           return token;
@@ -379,9 +392,11 @@ export function tokenize(str1: string): CSSTokenInterface[] {
           break;
         }
       }
-      if (whitespace(next())) consume();
+      if (whitespace(next()))
+        consume();
       let value = parseInt(digits.map(function(x) { return String.fromCharCode(x); }).join(''), 16);
-      if (value > maximumallowedcodepoint) value = 0xfffd;
+      if (value > maximumallowedcodepoint)
+        value = 0xfffd;
       return value;
     } else if (eof()) {
       return 0xfffd;
@@ -391,8 +406,10 @@ export function tokenize(str1: string): CSSTokenInterface[] {
   };
 
   const areAValidEscape = function(c1: number, c2: number) {
-    if (c1 !== 0x5c) return false;
+    if (c1 !== 0x5c)
-    if (newline(c2)) return false;
+      return false;
+    if (newline(c2))
+      return false;
     return true;
   };
   const startsWithAValidEscape = function() {
@@ -416,11 +433,14 @@ export function tokenize(str1: string): CSSTokenInterface[] {
 
   const wouldStartANumber = function(c1: number, c2: number, c3: number) {
     if (c1 === 0x2b || c1 === 0x2d) {
-      if (digit(c2)) return true;
+      if (digit(c2))
-      if (c2 === 0x2e && digit(c3)) return true;
+        return true;
+      if (c2 === 0x2e && digit(c3))
+        return true;
       return false;
     } else if (c1 === 0x2e) {
-      if (digit(c2)) return true;
+      if (digit(c2))
+        return true;
       return false;
     } else if (digit(c1)) {
       return true;
@@ -519,7 +539,8 @@ export function tokenize(str1: string): CSSTokenInterface[] {
   while (!eof(next())) {
     tokens.push(consumeAToken());
     iterationCount++;
-    if (iterationCount > str.length * 2) throw new Error("I'm infinite-looping!");
+    if (iterationCount > str.length * 2)
+      throw new Error("I'm infinite-looping!");
   }
   return tokens;
 }

packages/playwright-ct-core/.eslintrc.js

@@ -1,3 +1,3 @@
 module.exports = {
-  extends: "../.eslintrc-with-ts-config.js",
+  extends: "../../.eslintrc-with-ts-config.js",
 };

packages/playwright-ct-svelte/registerSource.mjs

@@ -55,7 +55,8 @@ function __pwCreateSlots(slots) {
           __pwInsert(target, element, anchor);
         },
         d: function destroy(detaching) {
-          if (detaching) __pwDetach(element);
+          if (detaching)
+            __pwDetach(element);
         },
         l: __pwNoop,
       };

packages/playwright/.eslintrc.js

@@ -1,5 +1,5 @@
 module.exports = {
-  extends: '../.eslintrc.js',
+  extends: '../../.eslintrc-with-ts-config.js',
   rules: {
     '@typescript-eslint/no-floating-promises': 'error',
   },

packages/playwright/src/matchers/matcherHint.ts

@@ -25,7 +25,7 @@ export function matcherHint(state: ExpectMatcherContext, locator: Locator | unde
   if (timeout)
     header = colors.red(`Timed out ${timeout}ms waiting for `) + header;
   if (locator)
-    header += `Locator: ${locator}\n`;
+    header += `Locator: ${String(locator)}\n`;
   return header;
 }
 

packages/playwright/src/matchers/matchers.ts

@@ -40,7 +40,7 @@ export function toBeAttached(
   locator: LocatorEx,
   options?: { attached?: boolean, timeout?: number },
 ) {
-  const attached = !options || options.attached === undefined || options.attached === true;
+  const attached = !options || options.attached === undefined || options.attached;
   const expected = attached ? 'attached' : 'detached';
   const unexpected = attached ? 'detached' : 'attached';
   const arg = attached ? '' : '{ attached: false }';
@@ -54,7 +54,7 @@ export function toBeChecked(
   locator: LocatorEx,
   options?: { checked?: boolean, timeout?: number },
 ) {
-  const checked = !options || options.checked === undefined || options.checked === true;
+  const checked = !options || options.checked === undefined || options.checked;
   const expected = checked ? 'checked' : 'unchecked';
   const unexpected = checked ? 'unchecked' : 'checked';
   const arg = checked ? '' : '{ checked: false }';
@@ -78,7 +78,7 @@ export function toBeEditable(
   locator: LocatorEx,
   options?: { editable?: boolean, timeout?: number },
 ) {
-  const editable = !options || options.editable === undefined || options.editable === true;
+  const editable = !options || options.editable === undefined || options.editable;
   const expected = editable ? 'editable' : 'readOnly';
   const unexpected = editable ? 'readOnly' : 'editable';
   const arg = editable ? '' : '{ editable: false }';
@@ -102,7 +102,7 @@ export function toBeEnabled(
   locator: LocatorEx,
   options?: { enabled?: boolean, timeout?: number },
 ) {
-  const enabled = !options || options.enabled === undefined || options.enabled === true;
+  const enabled = !options || options.enabled === undefined || options.enabled;
   const expected = enabled ? 'enabled' : 'disabled';
   const unexpected = enabled ? 'disabled' : 'enabled';
   const arg = enabled ? '' : '{ enabled: false }';
@@ -136,7 +136,7 @@ export function toBeVisible(
   locator: LocatorEx,
   options?: { visible?: boolean, timeout?: number },
 ) {
-  const visible = !options || options.visible === undefined || options.visible === true;
+  const visible = !options || options.visible === undefined || options.visible;
   const expected = visible ? 'visible' : 'hidden';
   const unexpected = visible ? 'hidden' : 'visible';
   const arg = visible ? '' : '{ visible: false }';

packages/playwright/src/runner/testServer.ts

@@ -43,7 +43,7 @@ export async function runTestServer() {
     onConnection(request: http.IncomingMessage, url: URL, ws: WebSocket, id: string) {
       const dispatcher = new Dispatcher(ws);
       ws.on('message', async message => {
-        const { id, method, params } = JSON.parse(message.toString());
+        const { id, method, params } = JSON.parse(String(message));
         try {
           const result = await (dispatcher as any)[method](params);
           ws.send(JSON.stringify({ id, result }));

packages/playwright/src/util.ts

@@ -208,7 +208,8 @@ export function addSuffixToFilePath(filePath: string, suffix: string, customExte
  */
 export function getContainedPath(parentPath: string, subPath: string = ''): string | null {
   const resolvedPath = path.resolve(parentPath, subPath);
-  if (resolvedPath === parentPath || resolvedPath.startsWith(parentPath + path.sep)) return resolvedPath;
+  if (resolvedPath === parentPath || resolvedPath.startsWith(parentPath + path.sep))
+    return resolvedPath;
   return null;
 }
 

tests/.eslintrc.js

@@ -11,5 +11,6 @@ module.exports = {
   },
   rules: {
     '@typescript-eslint/no-floating-promises': 'error',
+    "@typescript-eslint/no-unnecessary-boolean-literal-compare": 2,
   },
 };

tests/page/page-event-console.spec.ts

@@ -38,7 +38,10 @@ it('should work @smoke', async ({ page, browserName }) => {
 it('should emit same log twice', async ({ page }) => {
   const messages = [];
   page.on('console', m => messages.push(m.text()));
-  await page.evaluate(() => { for (let i = 0; i < 2; ++i) console.log('hello'); });
+  await page.evaluate(() => {
+    for (let i = 0; i < 2; ++i)
+      console.log('hello');
+  });
   expect(messages).toEqual(['hello', 'hello']);
 });
 

tests/page/page-screenshot.spec.ts

@@ -723,7 +723,7 @@ it.describe('page screenshot animations', () => {
       el.addEventListener('transitionend', () => {
         const time = Date.now();
         // Block main thread for 200ms, emulating heavy layout.
-        while (Date.now() - time < 200) ;
+        while (Date.now() - time < 200) {}
         const h1 = document.createElement('h1');
         h1.textContent = 'woof-woof';
         document.body.append(h1);

tests/playwright-test/web-server.spec.ts

@@ -438,7 +438,8 @@ test(`should support self signed certificate`, async ({ runInlineTest, httpsServ
 test('should send Accept header', async ({ runInlineTest, server }) => {
   let acceptHeader: string | undefined | null = null;
   server.setRoute('/hello', (req, res) => {
-    if (acceptHeader === null) acceptHeader = req.headers.accept;
+    if (acceptHeader === null)
+      acceptHeader = req.headers.accept;
     res.end('<html><body>hello</body></html>');
   });
   const result = await runInlineTest({

utils/doclint/linting-code-snippets/cli.js

@@ -180,7 +180,10 @@ class JSLintingService extends LintingService {
    * @returns {Promise<LintResult[]>}
    */
   async lint(snippets) {
-    return Promise.all(snippets.map(async snippet => this._lintSnippet(snippet)));
+    const result = [];
+    for (let i = 0; i < snippets.length; ++i)
+      result.push(await this._lintSnippet(snippets[i]));
+    return result;
   }
 }