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Troubleshooting

This is collection of various errors and warnings that you can encounter when using any variation (or lack of) rewire, webpack, rewire-webpack (the original version), the fork dribba/rewire-webpack and this fork rewire-webpack-plugin.

Bundling a script with webpack that requires rewire, but without using any plugins

$ webpack

Hash: 9041342f61ee15f58a1a
Version: webpack 4.33.0
Time: 4080ms
Built at: 06/12/2019 12:30:15 PM
  Asset     Size  Chunks             Chunk Names
null.js  5.4 MiB    null  [emitted]  null
Entrypoint null = null.js
[0] util (ignored) 15 bytes {null} [built]
[1] util (ignored) 15 bytes {null} [built]
[2] buffer (ignored) 15 bytes {null} [optional] [built]
[3] crypto (ignored) 15 bytes {null} [optional] [built]
[./node_modules/eslint/lib sync recursive] ./node_modules/eslint/lib sync 160 bytes {null} [built]
[./node_modules/eslint/lib/config sync recursive] ./node_modules/eslint/lib/config sync 160 bytes {null} [built]
[./node_modules/eslint/lib/config sync recursive ^.*\/package\.json$] ./node_modules/eslint/lib/config sync ^.*\/package\.json$ 160 bytes {null} [optional] [built]
[./node_modules/import-fresh sync recursive] ./node_modules/import-fresh sync 160 bytes {null} [built]
[./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 472 bytes {null} [built]
[./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {null} [built]
[./require-rewire.js] 68 bytes {null} [built]
    + 665 hidden modules

WARNING in ./node_modules/eslint/lib/linter.js 451:46-65
Critical dependency: the request of a dependency is an expression
 @ ./node_modules/eslint/lib/api.js
 @ ./node_modules/rewire/lib/moduleEnv.js
 @ ./node_modules/rewire/lib/rewire.js
 @ ./node_modules/rewire/lib/index.js
 @ ./require-rewire.js

... 8 similar warnings omitted ...

WARNING in ./node_modules/rewire/lib/moduleEnv.js
Module not found: Error: Can't resolve 'coffee-script' in 'xxx/node_modules/rewire/lib'
 @ ./node_modules/rewire/lib/moduleEnv.js
 @ ./node_modules/rewire/lib/rewire.js
 @ ./node_modules/rewire/lib/index.js
 @ ./require-rewire.js

... 1 similar warning omitted ...

WARNING in ./node_modules/rewire/lib/moduleEnv.js 85:34-52
require.extensions is not supported by webpack. Use a loader instead.
 @ ./node_modules/rewire/lib/rewire.js 6:16-41
 @ ./node_modules/rewire/lib/index.js
 @ ./require-rewire.js

... 5 similar warning omitted ...

ERROR in ./node_modules/eslint/lib/cli-engine.js
Module not found: Error: Can't resolve 'fs' in 'xxx/node_modules/eslint/lib'
 @ ./node_modules/eslint/lib/cli-engine.js 18:11-24
 @ ./node_modules/eslint/lib/api.js
 @ ./node_modules/rewire/lib/moduleEnv.js
 @ ./node_modules/rewire/lib/rewire.js
 @ ./node_modules/rewire/lib/index.js
 @ ./require-rewire.js

... 25 similar errors omitted ...

Solution

Add rewire-webpack-plugin to your webpack config:

// webpack.config.js

const RewireWebpackPlugin = require("rewire-webpack-plugin");
module.exports = {

	// ...

	plugins: [
		new RewireWebpackPlugin()
	]
};