What steps should be taken when encountering an error with fs while using ANTLR?

I have encountered an issue with antlr while using Angular in Visual Studio Code. I am familiar with including and writing a grammar in a project, but recently I ran into a problem when starting it:

"ERROR in ./node_modules/antlr4/CharStreams.js Module not found: Error: Can't resolve 'fs' in 'C:\Users\simon\antlrTestProject\node_modules\antlr4' ERROR in ./node_modules/antlr4/FileStream.js Module not found: Error: Can't resolve 'fs' in 'C:\Users\simon\antlrTestProject\node_modules\antlr4'"

After some investigation, I discovered that 'fs' is no longer available in Angular 6+. Unfortunately, I have yet to find a solution to this issue.

angulartypescriptvisual-studio-codeantlr4

Answer №1

To utilize the ANTLR JavaScript runtime outside of node.js, it is essential to adjust webpack settings to eliminate specific modules that are present in node.js but not supported in browsers. As stated in official documentation:

Within the webpack configuration file, exclude node.js exclusive modules by using: 

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

Answer №2

If you've tried the recommended fixes without success, there's one unconventional solution that has worked for me specifically with angular CLI projects.

Navigate to node_modules / @angular-devkit / build-angular / src /angular-cli-files /models / webpack-configs / browser.js

You'll find a JSON object with a key-value pair:

node: null

Update it to:

node: { fs: "empty" }

This solution is not ideal because:

  • You'll need to repeat this change every time you update the package;
  • Your team members will also need to be aware of and apply this change.

A more sustainable solution would be if there was a way to enforce this change automatically.

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