fix: show warning if bail and watch are used together

packages/webpack-cli/lib/bootstrap.js

@@ -71,6 +71,10 @@ async function runCLI(cliArgs) {
             parsedArgsOpts.entry = entry;
         }
 
+        if (parsedArgsOpts.bail && parsedArgsOpts.watch) {
+            logger.warn('You are using "bail" with "watch". "bail" will still exit webpack when the first error is found.');
+        }
+
         const result = await cli.run(parsedArgsOpts, core);
         if (!result) {
             return;

packages/webpack-cli/lib/groups/ConfigGroup.js

@@ -127,6 +127,12 @@ class ConfigGroup extends GroupHelper {
             newOptionsObject['options'] = configOptions;
         }
 
+        //warn the user if bail and watch both are used together
+        const { bail, watch } = newOptionsObject['options'];
+        if (bail && watch) {
+            logger.warn('You are using "bail" with "watch". "bail" will still exit webpack when the first error is found.');
+        }
+
         if (configOptions && configPath.includes('.webpack')) {
             const currentPath = configPath;
             const parentContext = dirname(currentPath).split(sep).slice(0, -1).join(sep);

test/bail/bail-and-watch-warning.test.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('bail and watch warning', () => {
+    it('should log warning if bail and watch both options are true', () => {
+        const { stderr, stdout } = run(__dirname, ['-c', 'webpack.config.js']);
+
+        expect(stderr).toContain(`You are using "bail" with "watch". "bail" will still exit webpack when the first error is found.`);
+        expect(stdout).toBeTruthy();
+    });
+});

test/bail/main.js

@@ -0,0 +1 @@
+console.log('bail and watch warning test');

test/bail/webpack.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+    entry: './main.js',
+    mode: 'development',
+    bail: true,
+    watch: true,
+};

test/core-flags/bail-flag.test.js

@@ -16,4 +16,12 @@ describe('--bail flag', () => {
         expect(stderr).toBeFalsy();
         expect(stdout).toContain('bail: false');
     });
+
+    it('should log warning if --bail and --watch are used together', () => {
+        const { stderr, stdout } = run(__dirname, ['--bail', '--watch']);
+
+        expect(stderr).toContain(`You are using "bail" with "watch". "bail" will still exit webpack when the first error is found.`);
+        expect(stdout).toContain('bail: true');
+        expect(stdout).toContain('watch: true');
+    });
 });