当命名导入不存在时，Webpack静默失败 [英] Webpack fails silently when named import doesn't exist

问题描述

当我尝试导入命名的导入时，如果导入的名称不存在，它会静默失败.当在构建时找不到导入时，有没有办法使webpack大声失败

When I try to import a named import, it fails silently if the name import does not exist. Is there a way to get webpack to fail loudly when it cannot find the import at build time

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.是否有webpack选项或其他一些我可以用来更快地捕获此错误的技术?

Instead, I want it to fail at build time. Is there a webpack option or some other technique I can use to catch this error sooner?

推荐答案

较新版本的webpack具有此功能.使用版本"webpack":"^ 4.16.5" 尝试捆绑问题中的示例时，收到以下警告.这正是我想要的.

Newer version of webpack have this functionality. Using version "webpack": "^4.16.5" I receive the following warning when I try to bundle the example from the question. This is exactly what I was looking for.

$ 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'

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