feat: implement new configtest command

.eslintignore

@@ -10,3 +10,4 @@ test/typescript/webpack.config.ts
 test/config/error-commonjs/syntax-error.js
 test/config/error-mjs/syntax-error.mjs
 test/config/error-array/webpack.config.js
+test/configtest/syntax-error.config.js

.prettierignore

@@ -9,3 +9,4 @@ test/config/error-mjs/syntax-error.mjs
 packages/webpack-cli/__tests__/test-assets/.yo-rc.json
 test/build-errors/stats.json
 packages/**/lib
+test/configtest/syntax-error.config.js

OPTIONS.md

@@ -549,7 +549,7 @@ Options:
   --watch-options-ignored-reset                                                      Clear all items provided in configuration. Ignore some files from watching (glob pattern or regexp).
   --watch-options-poll <value>                                                       `number`: use polling with specified interval. `true`: use polling.
   --watch-options-stdin                                                              Stop watching when stdin stream has ended.
-  --no-watch-options-stdin                                                           Negative 'watch-options-stdin' option.
+  --no-watch-options-stdin                                                           Do not stop watching when stdin stream has ended.
 
 Global options:
   --color                                    Enable colors on console.
@@ -559,14 +559,15 @@ Global options:
 
 Commands:
   bundle|b [options]                         Run webpack (default command, can be omitted).
-  help|h                                     Display help for commands and options.
   version|v                                  Output the version number of 'webpack', 'webpack-cli' and 'webpack-dev-server' and commands.
+  help|h                                     Display help for commands and options.
   serve|s [options]                          Run the webpack dev server.
   info|i [options]                           Outputs information about your system.
   init|c [options] [scaffold...]             Initialize a new webpack configuration.
   loader|l [output-path]                     Scaffold a loader.
-  plugin|p [output-path]                     Scaffold a plugin.
   migrate|m <config-path> [new-config-path]  Migrate a configuration to a new version.
+  configtest|t <config-path>                 Tests webpack configuration against validation errors.
+  plugin|p [output-path]                     Scaffold a plugin.
 
 To see list of all supported commands and options run 'webpack --help=verbose'.
 

packages/configtest/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@webpack-cli/configtest",
+  "version": "1.0.0",
+  "description": "Tests webpack configuration against validation errors.",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "files": [
+    "lib"
+  ],
+  "peerDependencies": {
+    "webpack": "4.x.x || 5.x.x",
+    "webpack-cli": "4.x.x"
+  }
+}

packages/configtest/src/index.ts

@@ -0,0 +1,54 @@
+import webpack from 'webpack';
+
+class ConfigTestCommand {
+    async apply(cli): Promise<void> {
+        const { logger } = cli;
+
+        await cli.makeCommand(
+            {
+                name: 'configtest <config-path>',
+                alias: 't',
+                description: 'Tests webpack configuration against validation errors.',
+                usage: '<config-path>',
+                pkg: '@webpack-cli/configtest',
+            },
+            [],
+            async (configPath: string): Promise<void> => {
+                const config = await cli.resolveConfig({ config: [configPath] });
+
+                try {
+                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                    const error: any = webpack.validate(config.options);
+
+                    // TODO remove this after drop webpack@4
+                    if (error && error.length > 0) {
+                        // eslint-disable-next-line @typescript-eslint/ban-ts-ignore
+                        // @ts-ignore
+                        throw new webpack.WebpackOptionsValidationError(error);
+                    }
+                } catch (error) {
+                    const isValidationError = (error) => {
+                        // https://github.com/webpack/webpack/blob/master/lib/index.js#L267
+                        // https://github.com/webpack/webpack/blob/v4.44.2/lib/webpack.js#L90
+                        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+                        const ValidationError = (webpack.ValidationError || webpack.WebpackOptionsValidationError) as any;
+
+                        return error instanceof ValidationError;
+                    };
+
+                    if (isValidationError(error)) {
+                        logger.error(error.message);
+                    } else {
+                        logger.error(error);
+                    }
+
+                    process.exit(2);
+                }
+
+                logger.success('There are no validation errors in the given webpack configuration.');
+            },
+        );
+    }
+}
+
+export default ConfigTestCommand;

packages/configtest/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./lib",
+    "rootDir": "./src"
+  },
+  "include": ["./src"]
+}

packages/webpack-cli/README.md

@@ -63,15 +63,16 @@ npx webpack-cli --help verbose
 ### Available Commands
 
 ```
-  bundle | b    Run webpack
-  help | h      Display help for commands and options
-  version | v   Output version number of the 'webpack', 'webpack-cli' and other related packages
-  init | c      Initialize a new webpack configuration
-  migrate | m   Migrate a configuration to a new version
-  loader | l    Scaffold a loader repository
-  plugin | p    Scaffold a plugin repository
-  info | i      Outputs information about your system and dependencies
-  serve | s     Run the webpack Dev Server
+  bundle | b      Run webpack
+  help | h        Display help for commands and options
+  version | v     Output version number of the 'webpack', 'webpack-cli' and other related packages
+  init | c        Initialize a new webpack configuration
+  migrate | m     Migrate a configuration to a new version
+  loader | l      Scaffold a loader repository
+  plugin | p      Scaffold a plugin repository
+  info | i        Outputs information about your system and dependencies
+  serve | s       Run the webpack Dev Server
+  configtest | t  Tests webpack configuration against validation errors.
 ```
 
 ### webpack 4

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

@@ -279,6 +279,11 @@ class WebpackCLI {
                 alias: 'm',
                 pkg: '@webpack-cli/migrate',
             },
+            {
+                name: 'configtest',
+                alias: 't',
+                pkg: '@webpack-cli/configtest',
+            },
         ];
 
         const knownCommands = [bundleCommandOptions, versionCommandOptions, helpCommandOptions, ...externalBuiltInCommandsInfo];

packages/webpack-cli/package.json

@@ -54,6 +54,9 @@
     "@webpack-cli/migrate": {
       "optional": true
     },
+    "@webpack-cli/configtest": {
+      "optional": true
+    },
     "webpack-bundle-analyzer": {
       "optional": true
     },

test/configtest/configtest.test.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const { run } = require('../utils/test-utils');
+
+describe('basic info usage', () => {
+    it('should validate webpack config successfully', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['configtest', './webpack.config.js'], false);
+
+        expect(exitCode).toBe(0);
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('There are no validation errors in the given webpack configuration.');
+    });
+
+    it('should throw validation error', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['configtest', './error.config.js'], false);
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain('Invalid configuration object.');
+        expect(stderr).toContain('configuration.mode should be one of these:');
+        expect(stdout).toBeFalsy();
+    });
+
+    it('should throw syntax error', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['configtest', './syntax-error.config.js'], false);
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain(`SyntaxError: Unexpected token ';'`);
+        expect(stdout).toBeFalsy();
+    });
+
+    it(`should validate the config with alias 't'`, () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['t', './error.config.js'], false);
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain('Invalid configuration object.');
+        expect(stderr).toContain('configuration.mode should be one of these:');
+        expect(stdout).toBeFalsy();
+    });
+
+    it('should throw error if configuration does not exist', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['configtest', './a.js'], false);
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain(`The specified config file doesn't exist`);
+        expect(stdout).toBeFalsy();
+    });
+
+    it('should throw error if no configuration was provided', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, ['configtest'], false);
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain(`error: missing required argument 'config-path'`);
+        expect(stdout).toBeFalsy();
+    });
+});

test/configtest/error.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+    mode: 'dev', // error
+    target: 'node',
+    stats: 'normal',
+};

test/configtest/src/index.js

@@ -0,0 +1 @@
+console.log('configtest command');

test/configtest/syntax-error.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+    name: 'config-error',
+    mode: 'development',
+    target: 'node'; //SyntaxError: Unexpected token ';'
+};

test/configtest/webpack.config.js

@@ -0,0 +1,5 @@
+module.exports = {
+    mode: 'development',
+    target: 'node',
+    stats: 'verbose',
+};

test/help/help.test.js

@@ -28,6 +28,7 @@ describe('help', () => {
         expect(stdout.match(/loader\|l/g)).toHaveLength(1);
         expect(stdout.match(/migrate\|m/g)).toHaveLength(1);
         expect(stdout.match(/plugin\|p/g)).toHaveLength(1);
+        expect(stdout.match(/configtest\|t/g)).toHaveLength(1);
         expect(stdout).toContain("To see list of all supported commands and options run 'webpack --help=verbose'.");
         expect(stdout).toContain('CLI documentation: https://webpack.js.org/api/cli/.');
         // TODO buggy on windows

tsconfig.json

@@ -20,11 +20,26 @@
     "declaration": true
   },
   "references": [
-    { "path": "packages/generators" },
-    { "path": "packages/info" },
-    { "path": "packages/init" },
-    { "path": "packages/migrate" },
-    { "path": "packages/serve" },
-    { "path": "packages/utils" }
+    {
+      "path": "packages/generators"
+    },
+    {
+      "path": "packages/info"
+    },
+    {
+      "path": "packages/init"
+    },
+    {
+      "path": "packages/migrate"
+    },
+    {
+      "path": "packages/serve"
+    },
+    {
+      "path": "packages/utils"
+    },
+    {
+      "path": "packages/configtest"
+    }
   ]
 }