Unable to resolve module when using babel module resolver + eslint + index files in react application

Question

I am trying to use babel module resolver plugin with eslint + create react app but I am unable to start the application, getting the error

internal/modules/cjs/loader.js:1237
throw err;
^

SyntaxError: C:\Users\enisr\Desktop\projects\pcPartPicker\jsconfig.json: 
Unexpected token } in JSON at position 166
at parse (<anonymous>)

I have set up a git repo showcasing the problem https://github.com/sgoulas/pcPartPicker

I have read the instructions in the docs and in the original repository and I am unable to configure it correctly.

My configuration files are the following:

.babelrc

{
"plugins": [
    ["module-resolver", {
        "extensions": [
            ".js",
            ".jsx",
            ".es",
            ".es6",
            ".mjs"
        ],
            "root": ["./src"],
            "alias": {
                "@components": "./src/components"
            }
        }
    ]
]
}

jsconfig.json

{
"compilerOptions": {
    "baseUrl": ".",
    "paths": {
         "*": ["src/*"],
        "@components/*": ["./src/components/*"],
    }
}
}

webpack.config.dev.js

var path = require("path");

module.exports = {
  include: path.appSrc,
  loader: require.resolve("babel-loader"),
  options: {
    plugins: [
     [
    "module-resolver",
    {
      root: ["./src/App"],
      alias: {
        "@components": "./src/components",
      },
        },
      ],
    ],
    cacheDirectory: true,
  },
};

My component:

import { GPUtable, CPUtable } from "@components/Tables";

const App = () => {
  return (
    <>
      <GPUtable />
      <CPUtable />
    </>
  );
};

export default App;

Answer 1

There are some minor fixes you need to make (below), but the main issue is that Create React App does not expose the webpack config, you'll need to eject to edit that.

1. npm run eject
2. Merge the babel configs: delete the babel key + value at the bottom of the package.json, and paste the value into your bablrc ("presets": ["react-app"],).
3. Add import React from 'react'; to the top of App.js

Confirmed locally that the app will run.

---

Other suggested fixes

1. Your jsconfig has a trailing comma after the array value in @components/*. You need to remove it because JSON doesn’t support them.
2. You need to fix the include path in weback.config.dev.js. appSrc isn't something defined on the node path module. Try using path.resolve(__dirname, 'src') - the example in their docs is creating/importing a paths object with appSrc pointing to this value.
3. You're missing test: /\.(js|jsx|mjs)$/, in webpack.config.dev.js.