feat: implement new configtest command

packages/configtest/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@webpack-cli/configtest",
+  "version": "1.2.1",
+  "description": "Test your webpack configuration",
+  "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 +1,32 @@
+import { validate } from 'webpack';
+
+class ConfigTestCommand {
+    async apply(cli): Promise<void> {
+        const { logger } = cli;
+
+        await cli.makeCommand(
+            {
+                name: 'configtest',
+                alias: 't',
+                description: 'Outputs information about your system.',
+                usage: '[configs]',
+                pkg: '@webpack-cli/configtest',
+            },
+            [],
+            async (program) => {
+                const { options } = await cli.resolveConfig({ config: program.args });
+                //eslint-disable-next-line @typescript-eslint/no-explicit-any
+                const validationErrors: any = validate(options);
+
+                if (validationErrors) {
+                    logger.error("Your configuration validation wasn't successful");
+                    logger.error(validationErrors);
+                }
+
+                logger.success('No errors found');
+            },
+        );
+    }
+}
+
+export default ConfigTestCommand;

packages/configtest/tsconfig.json

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

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];

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"
+    }
   ]
 }