feat: add WEBPACK_PACKAGE env var to use custom webpack package

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

@@ -9,7 +9,7 @@ const utils = require('./utils');
 class WebpackCLI {
     constructor() {
         // Global
-        this.webpack = require('webpack');
+        this.webpack = require(process.env.WEBPACK_PACKAGE || 'webpack');
         this.logger = utils.logger;
         this.utils = utils;
 

test/build/custom-webpack/custom-webpack.js

@@ -0,0 +1 @@
+module.exports = require('webpack');

test/build/custom-webpack/custom-webpack.test.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const { resolve } = require('path');
+const { run } = require('../../utils/test-utils');
+
+describe('custom-webpack', () => {
+    it('should use custom-webpack.js', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, [], {
+            env: { WEBPACK_PACKAGE: resolve(__dirname, './custom-webpack.js') },
+        });
+
+        expect(exitCode).toBe(0);
+        expect(stderr).toBeFalsy();
+        expect(stdout).toContain('main.js');
+    });
+
+    it('should throw an error for invalid-webpack.js', () => {
+        const { exitCode, stderr, stdout } = run(__dirname, [], {
+            env: { WEBPACK_PACKAGE: resolve(__dirname, './invalid-webpack.js') },
+        });
+
+        expect(exitCode).toBe(2);
+        expect(stderr).toContain(`Error: Cannot find module`);
+        expect(stdout).toBeFalsy();
+    });
+});

test/build/custom-webpack/src/index.js

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

test/build/custom-webpack/webpack.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+    mode: 'production',
+};