fix: throw err when supplied config is absent

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

@@ -4,7 +4,7 @@ const webpackMerge = require('webpack-merge');
 const { extensions, jsVariants } = require('interpret');
 const GroupHelper = require('../utils/GroupHelper');
 const rechoir = require('rechoir');
-const MergeError = require('../utils/errors/MergeError');
+const ConfigError = require('../utils/errors/ConfigError');
 const logger = require('../utils/logger');
 
 // Order defines the priority, in increasing order
@@ -157,11 +157,7 @@ class ConfigGroup extends GroupHelper {
             const configPath = resolve(process.cwd(), config);
             const configFiles = getConfigInfoFromFileName(configPath);
             if (!configFiles.length) {
-                this.opts.processingMessageBuffer.push({
-                    lvl: 'warn',
-                    msg: `Configuration ${config} not found in ${configPath}`,
-                });
-                return;
+                throw new ConfigError(`The specified config file doesn't exist in ${configPath}`);
             }
             const foundConfig = configFiles[0];
             const resolvedConfig = this.requireConfig(foundConfig);
@@ -196,7 +192,7 @@ class ConfigGroup extends GroupHelper {
             const newConfigPath = this.resolveFilePath(merge);
 
             if (!newConfigPath) {
-                throw new MergeError("The supplied merge config doesn't exist.");
+                throw new ConfigError("The supplied merge config doesn't exist.", 'MergeError');
             }
 
             const configFiles = getConfigInfoFromFileName(newConfigPath);

packages/webpack-cli/lib/utils/errors/ConfigError.js

@@ -0,0 +1,11 @@
+class ConfigError extends Error {
+    constructor(message, name) {
+        super(message);
+        this.name = name || 'ConfigError';
+        // No need to show stack trace for known errors
+        this.stack = '';
+        process.exitCode = 2;
+    }
+}
+
+module.exports = ConfigError;

test/config/absent/a.js

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

test/config/absent/config-absent.test.js

@@ -0,0 +1,17 @@
+'use strict';
+const { existsSync } = require('fs');
+const { resolve } = require('path');
+const { run } = require('../../utils/test-utils');
+
+describe('Config:', () => {
+    it('supplied config file is absent', () => {
+        const { stdout, stderr, exitCode } = run(__dirname, ['-c', resolve(__dirname, 'webpack.config.js')], false);
+        // should throw with correct exit code
+        expect(exitCode).toBe(2);
+        expect(stdout).toBeFalsy();
+        // Should contain the correct error message
+        expect(stderr).toContain("ConfigError: The specified config file doesn't exist in");
+        // Should not bundle
+        expect(existsSync(resolve(__dirname, './binary/a.bundle.js'))).toBeFalsy();
+    });
+});

test/config/absent/webpack.config-absent.js

@@ -0,0 +1,9 @@
+const { resolve } = require('path');
+
+module.exports = {
+    entry: './a.js',
+    output: {
+        path: resolve(__dirname, 'binary'),
+        filename: 'a.bundle.js',
+    },
+};