test: enable no-empty ESLint rule

PR-URL: nodejs#41831
Backport-PR-URL: nodejs#42160
Refs: https://eslint.org/docs/rules/no-empty
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

test/.eslintrc.yaml

@@ -5,10 +5,11 @@ env:
   es6: true
 
 rules:
+  multiline-comment-style: ["error", "separate-lines"]
+  no-empty: error
   no-var: error
   prefer-const: error
   symbol-description: off
-  multiline-comment-style: ["error", "separate-lines"]
 
   no-restricted-syntax:
     # Config copied from .eslintrc.js

test/addons/uv-handle-leak/test.js

@@ -16,7 +16,9 @@ try {
   const { isMainThread } = require('worker_threads');
   if (!isMainThread)
     common.skip('Cannot run test in environment with clean-exit policy');
-} catch {}
+} catch {
+  // Continue regardless of error.
+}
 
 binding.leakHandle();
 binding.leakHandle(0);

test/common/inspector-helper.js

@@ -365,8 +365,7 @@ class NodeInstance extends EventEmitter {
       ['--expose-internals'],
       `${scriptContents}\nprocess._rawDebug('started');`, undefined);
     const msg = 'Timed out waiting for process to start';
-    while (await fires(instance.nextStderrString(), msg, TIMEOUT) !==
-             'started') {}
+    while (await fires(instance.nextStderrString(), msg, TIMEOUT) !== 'started');
     process._debugProcess(instance._process.pid);
     return instance;
   }

test/common/report.js

@@ -46,7 +46,9 @@ function validateContent(report, fields = []) {
   } catch (err) {
     try {
       err.stack += util.format('\n------\nFailing Report:\n%O', report);
-    } catch {}
+    } catch {
+      // Continue regardless of error.
+    }
     throw err;
   }
 }

test/internet/test-dgram-broadcast-multi-process.js

@@ -184,7 +184,9 @@ if (process.argv[2] !== 'child') {
     const buf = messages[i++];
 
     if (!buf) {
-      try { sendSocket.close(); } catch {}
+      try { sendSocket.close(); } catch {
+        // Continue regardless of error.
+      }
       return;
     }
 

test/internet/test-dgram-multicast-multi-process.js

@@ -170,7 +170,9 @@ if (process.argv[2] !== 'child') {
     const buf = messages[i++];
 
     if (!buf) {
-      try { sendSocket.close(); } catch {}
+      try { sendSocket.close(); } catch {
+        // Continue regardless of error.
+      }
       return;
     }
 

test/internet/test-dgram-multicast-ssm-multi-process.js

@@ -164,7 +164,9 @@ if (process.argv[2] !== 'child') {
     const buf = messages[i++];
 
     if (!buf) {
-      try { sendSocket.close(); } catch {}
+      try { sendSocket.close(); } catch {
+        // Continue regardless of error.
+      }
       return;
     }
 

test/internet/test-dgram-multicast-ssmv6-multi-process.js

@@ -164,7 +164,9 @@ if (process.argv[2] !== 'child') {
     const buf = messages[i++];
 
     if (!buf) {
-      try { sendSocket.close(); } catch {}
+      try { sendSocket.close(); } catch {
+        // Continue regardless of error.
+      }
       return;
     }
 

test/message/vm_dont_display_runtime_error.js

@@ -30,7 +30,9 @@ try {
     filename: 'test.vm',
     displayErrors: false
   });
-} catch {}
+} catch {
+  // Continue regardless of error.
+}
 
 console.error('middle');
 

test/message/vm_dont_display_syntax_error.js

@@ -30,7 +30,9 @@ try {
     filename: 'test.vm',
     displayErrors: false
   });
-} catch {}
+} catch {
+  // Continue regardless of error.
+}
 
 console.error('middle');
 

test/node-api/test_fatal/test_threads.js

@@ -8,8 +8,9 @@ const test_fatal = require(`./build/${common.buildType}/test_fatal`);
 // that crashes the process.
 if (process.argv[2] === 'child') {
   test_fatal.TestThread();
-  // Busy loop to allow the work thread to abort.
-  while (true) {}
+  while (true) {
+    // Busy loop to allow the work thread to abort.
+  }
 }
 
 const p = child_process.spawnSync(

test/node-api/test_fatal/test_threads_report.js

@@ -16,7 +16,7 @@ if (common.buildType === 'Debug')
 if (process.argv[2] === 'child') {
   test_fatal.TestThread();
   // Busy loop to allow the work thread to abort.
-  while (true) {}
+  while (true);
 }
 
 tmpdir.refresh();

test/parallel/test-async-hooks-run-in-async-scope-caught-exception.js

@@ -5,5 +5,7 @@ const { AsyncResource } = require('async_hooks');
 
 try {
   new AsyncResource('foo').runInAsyncScope(() => { throw new Error('bar'); });
-} catch {}
+} catch {
+  // Continue regardless of error.
+}
 // Should abort (fail the case) if async id is not matching.

test/parallel/test-cluster-kill-infinite-loop.js

@@ -17,5 +17,5 @@ if (cluster.isPrimary) {
     assert.strictEqual(signal, 'SIGTERM');
   }));
 } else {
-  while (true) {}
+  while (true);
 }

test/parallel/test-domain-with-abort-on-uncaught-exception.js

@@ -49,6 +49,7 @@ if (process.argv[2] === 'child') {
         try {
           throw new Error(domainErrHandlerExMessage);
         } catch {
+          // Continue regardless of error.
         }
       } else {
         throw new Error(domainErrHandlerExMessage);

test/parallel/test-file-write-stream2.js

@@ -56,7 +56,9 @@ process.on('exit', function() {
 function removeTestFile() {
   try {
     fs.unlinkSync(filepath);
-  } catch {}
+  } catch {
+    // Continue regardless of error.
+  }
 }
 
 

test/parallel/test-fs-access.js

@@ -60,6 +60,7 @@ if (!common.isWindows && process.getuid() === 0) {
     process.setuid('nobody');
     hasWriteAccessForReadonlyFile = false;
   } catch {
+    // Continue regardless of error.
   }
 }
 

test/parallel/test-fs-promises-watch.js

@@ -75,42 +75,54 @@ for (const testCase of kCases) {
 }
 
 assert.rejects(
-  // eslint-disable-next-line no-unused-vars
-  async () => { for await (const _ of watch(1)) {} },
+  async () => {
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch(1)) { }
+  },
   { code: 'ERR_INVALID_ARG_TYPE' });
 
 assert.rejects(
-  // eslint-disable-next-line no-unused-vars
-  async () => { for await (const _ of watch(__filename, 1)) {} },
+  async () => {
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch(__filename, 1)) { }
+  },
   { code: 'ERR_INVALID_ARG_TYPE' });
 
 assert.rejects(
-  // eslint-disable-next-line no-unused-vars
-  async () => { for await (const _ of watch('', { persistent: 1 })) {} },
+  async () => {
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch('', { persistent: 1 })) { }
+  },
   { code: 'ERR_INVALID_ARG_TYPE' });
 
 assert.rejects(
-  // eslint-disable-next-line no-unused-vars
-  async () => { for await (const _ of watch('', { recursive: 1 })) {} },
+  async () => {
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch('', { recursive: 1 })) { }
+  },
   { code: 'ERR_INVALID_ARG_TYPE' });
 
 assert.rejects(
-  // eslint-disable-next-line no-unused-vars
-  async () => { for await (const _ of watch('', { encoding: 1 })) {} },
+  async () => {
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch('', { encoding: 1 })) { }
+  },
   { code: 'ERR_INVALID_ARG_VALUE' });
 
 assert.rejects(
-  // eslint-disable-next-line no-unused-vars
-  async () => { for await (const _ of watch('', { signal: 1 })) {} },
+  async () => {
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch('', { signal: 1 })) { }
+  },
   { code: 'ERR_INVALID_ARG_TYPE' });
 
 (async () => {
   const ac = new AbortController();
   const { signal } = ac;
   setImmediate(() => ac.abort());
   try {
-    // eslint-disable-next-line no-unused-vars
-    for await (const _ of watch(__filename, { signal })) {}
+    // eslint-disable-next-line no-unused-vars, no-empty
+    for await (const _ of watch(__filename, { signal })) { }
   } catch (err) {
     assert.strictEqual(err.name, 'AbortError');
   }

test/parallel/test-fs-realpath.js

@@ -108,7 +108,9 @@ function test_simple_relative_symlink(realpath, realpathSync, callback) {
   [
     [entry, `../${path.basename(tmpDir)}/cycles/root.js`],
   ].forEach(function(t) {
-    try { fs.unlinkSync(t[0]); } catch {}
+    try { fs.unlinkSync(t[0]); } catch {
+      // Continue regardless of error.
+    }
     console.log('fs.symlinkSync(%j, %j, %j)', t[1], t[0], 'file');
     fs.symlinkSync(t[1], t[0], 'file');
     unlink.push(t[0]);
@@ -134,7 +136,9 @@ function test_simple_absolute_symlink(realpath, realpathSync, callback) {
   [
     [entry, expected],
   ].forEach(function(t) {
-    try { fs.unlinkSync(t[0]); } catch {}
+    try { fs.unlinkSync(t[0]); } catch {
+      // Continue regardless of error.
+    }
     console.error('fs.symlinkSync(%j, %j, %j)', t[1], t[0], type);
     fs.symlinkSync(t[1], t[0], type);
     unlink.push(t[0]);
@@ -159,13 +163,17 @@ function test_deep_relative_file_symlink(realpath, realpathSync, callback) {
                                 expected);
   const linkPath1 = path.join(targetsAbsDir,
                               'nested-index', 'one', 'symlink1.js');
-  try { fs.unlinkSync(linkPath1); } catch {}
+  try { fs.unlinkSync(linkPath1); } catch {
+    // Continue regardless of error.
+  }
   fs.symlinkSync(linkData1, linkPath1, 'file');
 
   const linkData2 = '../one/symlink1.js';
   const entry = path.join(targetsAbsDir,
                           'nested-index', 'two', 'symlink1-b.js');
-  try { fs.unlinkSync(entry); } catch {}
+  try { fs.unlinkSync(entry); } catch {
+    // Continue regardless of error.
+  }
   fs.symlinkSync(linkData2, entry, 'file');
   unlink.push(linkPath1);
   unlink.push(entry);
@@ -186,13 +194,17 @@ function test_deep_relative_dir_symlink(realpath, realpathSync, callback) {
   const path1b = path.join(targetsAbsDir, 'nested-index', 'one');
   const linkPath1b = path.join(path1b, 'symlink1-dir');
   const linkData1b = path.relative(path1b, expected);
-  try { fs.unlinkSync(linkPath1b); } catch {}
+  try { fs.unlinkSync(linkPath1b); } catch {
+    // Continue regardless of error.
+  }
   fs.symlinkSync(linkData1b, linkPath1b, 'dir');
 
   const linkData2b = '../one/symlink1-dir';
   const entry = path.join(targetsAbsDir,
                           'nested-index', 'two', 'symlink12-dir');
-  try { fs.unlinkSync(entry); } catch {}
+  try { fs.unlinkSync(entry); } catch {
+    // Continue regardless of error.
+  }
   fs.symlinkSync(linkData2b, entry, 'dir');
   unlink.push(linkPath1b);
   unlink.push(entry);
@@ -216,7 +228,9 @@ function test_cyclic_link_protection(realpath, realpathSync, callback) {
     [path.join(tmpDir, '/cycles/realpath-3b'), '../cycles/realpath-3c'],
     [path.join(tmpDir, '/cycles/realpath-3c'), '../cycles/realpath-3a'],
   ].forEach(function(t) {
-    try { fs.unlinkSync(t[0]); } catch {}
+    try { fs.unlinkSync(t[0]); } catch {
+      // Continue regardless of error.
+    }
     fs.symlinkSync(t[1], t[0], 'dir');
     unlink.push(t[0]);
   });
@@ -243,7 +257,9 @@ function test_cyclic_link_overprotection(realpath, realpathSync, callback) {
   const link = `${folder}/cycles`;
   let testPath = cycles;
   testPath += '/folder/cycles'.repeat(10);
-  try { fs.unlinkSync(link); } catch {}
+  try { fs.unlinkSync(link); } catch {
+    // Continue regardless of error.
+  }
   fs.symlinkSync(cycles, link, 'dir');
   unlink.push(link);
   assertEqualPath(realpathSync(testPath), path.resolve(expected));
@@ -271,7 +287,9 @@ function test_relative_input_cwd(realpath, realpathSync, callback) {
   ].forEach(function(t) {
     const fn = t[0];
     console.error('fn=%j', fn);
-    try { fs.unlinkSync(fn); } catch {}
+    try { fs.unlinkSync(fn); } catch {
+      // Continue regardless of error.
+    }
     const b = path.basename(t[1]);
     const type = (b === 'root.js' ? 'file' : 'dir');
     console.log('fs.symlinkSync(%j, %j, %j)', t[1], fn, type);
@@ -309,8 +327,12 @@ function test_deep_symlink_mix(realpath, realpathSync, callback) {
   // $tmpDir/targets/cycles/root.js (hard)
 
   const entry = tmp('node-test-realpath-f1');
-  try { fs.unlinkSync(tmp('node-test-realpath-d2/foo')); } catch {}
-  try { fs.rmdirSync(tmp('node-test-realpath-d2')); } catch {}
+  try { fs.unlinkSync(tmp('node-test-realpath-d2/foo')); } catch {
+    // Continue regardless of error.
+  }
+  try { fs.rmdirSync(tmp('node-test-realpath-d2')); } catch {
+    // Continue regardless of error.
+  }
   fs.mkdirSync(tmp('node-test-realpath-d2'), 0o700);
   try {
     [
@@ -325,7 +347,9 @@ function test_deep_symlink_mix(realpath, realpathSync, callback) {
       [`${targetsAbsDir}/nested-index/two/realpath-c`,
        `${tmpDir}/cycles/root.js`],
     ].forEach(function(t) {
-      try { fs.unlinkSync(t[0]); } catch {}
+      try { fs.unlinkSync(t[0]); } catch {
+        // Continue regardless of error.
+      }
       fs.symlinkSync(t[1], t[0]);
       unlink.push(t[0]);
     });
@@ -479,14 +503,18 @@ function test_abs_with_kids(realpath, realpathSync, cb) {
     ['/a/b/c/x.txt',
      '/a/link',
     ].forEach(function(file) {
-      try { fs.unlinkSync(root + file); } catch {}
+      try { fs.unlinkSync(root + file); } catch {
+        // Continue regardless of error.
+      }
     });
     ['/a/b/c',
      '/a/b',
      '/a',
      '',
     ].forEach(function(folder) {
-      try { fs.rmdirSync(root + folder); } catch {}
+      try { fs.rmdirSync(root + folder); } catch {
+        // Continue regardless of error.
+      }
     });
   }
 

test/parallel/test-global.js

@@ -36,7 +36,9 @@ builtinModules.forEach((moduleName) => {
       // This could throw for e.g., crypto if the binary is not compiled
       // accordingly.
       require(moduleName);
-    } catch {}
+    } catch {
+      // Continue regardless of error.
+    }
   }
 });