javascript - 当命名导入不存在时，Webpack 静默失败

Question

当我尝试导入命名导入时，如果名称导入不存在，它会自动失败。有没有办法让 webpack 在构建时找不到导入时大声失败

例如:

// file1.js
const var1 = 'var1'
export { var1 }

和

// file2.js
import { var2 } from './file1'
// at this point, var2 is undefined at runtime because it was never exported from file1.js

相反，我希望它在构建时失败。我可以使用 webpack 选项或其他一些技术来更快地捕获此错误吗？

Answer 1

较新版本的 webpack 具有此功能。当我尝试从问题中捆绑示例时，使用 "webpack": "^4.16.5" 版本收到以下警告。这正是我要找的。

$ npx webpack
Hash: cd3bacb4d03dd9e2e456
Version: webpack 4.16.5
Time: 377ms
Built at: 08/07/2018 9:38:12 AM
  Asset       Size  Chunks             Chunk Names
main.js  971 bytes       0  [emitted]  main
Entrypoint main = main.js
[0] ./src/index.js + 1 modules 201 bytes {0} [built]
    | ./src/index.js 153 bytes [built]
    | ./src/file1.js 48 bytes [built]

WARNING in ./src/index.js 3:12-16
"export 'var2' was not found in './file1'