feat: add test and docs for umi webpack in production (#5920)

* feat: add test and docs for umi webpack in production

* feat: add test and docs for umi webpack in production

* feat: add test and docs for umi webpack in production

Co-authored-by: 纪颖志 <jiyingzhi@black-unique.com>

docs/docs/cli.md

@@ -236,3 +236,13 @@ MiniCssExtractPlugin {
   }
 }
 ```
+
+默认会打印 development 的配置，如需查看 production 配置，需要指定环境变量：
+
+```bash
+$ NODE_ENV=production umi webpack
+
+{
+  mode: 'production'
+}
+```

docs/docs/cli.zh-CN.md

@@ -231,3 +231,13 @@ MiniCssExtractPlugin {
   }
 }
 ```
+
+默认会打印 development 的配置，如需查看 production 配置，需要指定环境变量：
+
+```bash
+$ NODE_ENV=production umi webpack
+
+{
+  mode: 'production'
+}
+```

packages/preset-built-in/src/plugins/commands/webpack/webpack.test.ts

@@ -20,6 +20,40 @@ test('webpack', async () => {
   expect(config.mode).toEqual('development');
 });
 
+test('webpack in production', async () => {
+  const cwd = join(fixtures, 'webpack');
+  const service = new Service({
+    cwd,
+    env: 'production',
+    presets: [require.resolve('../../../index.ts')],
+  });
+  const config = await service.run({
+    name: 'webpack',
+    args: {
+      print: false,
+    },
+  });
+  // @ts-ignore
+  expect(config.mode).toEqual('production');
+});
+
+test('webpack in test', async () => {
+  const cwd = join(fixtures, 'webpack');
+  const service = new Service({
+    cwd,
+    env: 'test',
+    presets: [require.resolve('../../../index.ts')],
+  });
+  const config = await service.run({
+    name: 'webpack',
+    args: {
+      print: false,
+    },
+  });
+  // @ts-ignore
+  expect(config.mode).toEqual('development');
+});
+
 test('webpack with plugins', async () => {
   const cwd = join(fixtures, 'webpack');
   const service = new Service({