error "Cannot resolve module 'fs' in ... antlr4/FileStream.js when trying to use JavaScript target

[Mike Cargal]

I see that the antler Javascript target has been added to NPM.

I've added the "antlr4" : "^4.5.2" dependency to my package,son file.

When I try to build through webpack I get the following error:

ERROR in ./~/antlr4/FileStream.js

Module not found: Error: Cannot resolve module 'fs' in <my project path>/node_modules/antlr4

 @ ./~antlr4/FileStream.js 38:20-33

The offending line is

var fs = isNodeJs ? require("FS") : null;

I'm going to be running in the browser, so I'm not node.js, but webpack doesn't know which way that ternary statement will evaluate and tries to resolve it.

Any suggestions on how to resolve this?

I'm not sure if it's the require.js (if so, I'm not sure how to reference it.  I'm also using the Babel transpiler for ES2015 syntax, and importing require.js doesn't work)

or if it's the 'fs' module (like the error message indicates.  I've tried adding "fs" to my dependencies as well, but that's not resolving the problem.

anyone have any clues?

[Eric Vergnaud]

Hi

in webpack.config.js, add the following:

module.exports = {
    entry: './index.js',
    output: {
        path: './',
        filename: 'your.bundle.js'
    },
    node: {
        module: "empty",
        fs: "empty"
    }
};

Eric

[Mike Cargal]

thanks Eric

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[neha agrawal]

Hi,

I got similar error for fileStream.js and Eric solution helped. But unfortunately I am getting similar error at 3 more places. How do I get rid of these errors? Can you please help me.

1)ERROR in ./src/main/resources/myProjectPath/antlr/runtime/Listener.js

 Module not found: Error: Cannot resolve module 'antlr4/index' 

2)ERROR in ./src/main/resources/myProjectPath/antlr/runtime/Lexer.js

 Module not found: Error: Cannot resolve module 'antlr4/index' 

3)ERROR in ./src/main/resources/myProjectPath/antlr/runtime/Parser.js

 Module not found: Error: Cannot resolve module 'antlr4/index' 

Thanks,

Neha

[Eric Vergnaud]

That must be a file path issue.

antlr4/index resolves to antlr4/index.js, which is part of the antlr4 release.