Webpack Error - configuration.node has an unknown property 'fs'

问题

I have encountered an error when using the latest version of Webpack (5.1.0). It looks like the configuration is throwing an error because the validation schema is too restrictive. Here is my webpack configuration file in a gist, and the error message I am seeing.

Webpack.config.js

https://gist.github.com/adarshbhat/3ec5950b66b78102da0cf46e51a3d633

Error

[webpack-cli] 
Invalid configuration object. Webpack has been initialized using a configuration object that does not match the API schema.
 - configuration.node should be one of these:
   false | object { __dirname?, __filename?, global? }
   -> Include polyfills or mocks for various node stuff.
   Details:
    * configuration.node has an unknown property 'module'. These properties are valid:
      object { __dirname?, __filename?, global? }
      -> Options object for node compatibility features.
    * configuration.node has an unknown property 'net'. These properties are valid:
      object { __dirname?, __filename?, global? }
      -> Options object for node compatibility features.
    * configuration.node has an unknown property 'fs'. These properties are valid:
      object { __dirname?, __filename?, global? }
      -> Options object for node compatibility features.
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! jstest@1.0.0 start: `webpack serve`
npm ERR! Exit status 2

I am attempting to use a parser generator library (antlr4) that works both in a Node.js environment, as well as in browsers. It looks like the library code is requiring global objects like fs, and if it is empty, assumes that it is in a browser environment. According to the documentation of Antlr4 and that of Webpack , this is a supported configuration file. But it is not working. Please help.

Versions

webpack: 5.1.0
webpack-cli: 4.0.0
webpack-dev-middleware: 3.7.2
webpack-dev-server: 3.11.0

Update (Oct 29 2020)

Antlr JavaScript documentation has now been updated with the new configuration for Webpack 5

回答1:

I managed to get this to work with some help from the Webpack team. Using the following webpack configuration as recommended by the antlr4 documentation is no longer supported.

Does not work

{
  node: {
    fs: 'empty',
    module: 'empty',
    net: 'empty'
  }
}

Working configuration

resolve: {
  fallback: {
    fs: false
  }
}

With this, I was able to get my JavaScript parser working.

Please note that there is an ongoing effort to update antlr4 to generate ES6 based code. This configuration may not be necessary in the future.

回答2:

Interesting enough, I get in case of path (but not with file) the following message, more clear of webpack CLI:

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
    - add a fallback 'resolve.fallback: { "path": require.resolve("path-browserify") }'
    - install 'path-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
    resolve.fallback: { "path": false }

However it seems to me this info should also be found here, and removed the statement that any built-in module can be used as property there: https://webpack.js.org/configuration/node/#node

来源：https://stackoverflow.com/questions/64361940/webpack-error-configuration-node-has-an-unknown-property-fs

标签

javascript

node.js

Webpack

antlr4