TypeError: languageDefinitions is undefined

[astrolemonade]

I am using vue and here is my vue.config.js

const MonacoWebpackPlugin = require('monaco-editor-webpack-plugin')

module.exports = {
  configureWebpack: {
   plugins: [
      new MonacoWebpackPlugin({
        // available options are documented at https://github.com/Microsoft/monaco-editor-webpack-plugin#options
        languages: ['javascript', 'css', 'html', 'typescript', 'json', 'text']
      })
    ]
  }
}

[jqrun]

I'm facing something similar, it seems like here: https://github.com/microsoft/monaco-languages/blob/0500e21d9594b49584ef27175776d8b52f2eedc9/src/_.contribution.ts#L17

languageDefinitions is undefined as a variable inside of the exported functions. Maybe some unexpected artifact of Webpack optimization? I'm still digging into this but would be curious if anyone else finds a solution/root cause.

[jqrun]

One thing I did find is that this issue goes away when switching from Node 12 + Npm 6 -> Node 14 + Npm 7, though in my case I need to stay in the lower versions.

[neon64]

I can sadly reproduce this with node v16.4.0, npm v7.17.0, and webpack 5.42.0, and monaco-editor-webpack-plugin 4.0.0 and monaco-editor 0.25.2.

[Nishchit14]

This is blocking for me too... any solution here?

[goofmint]

I selected those versions and I can resolve this problem.

    "monaco-editor": "0.20.0",
    "monaco-editor-webpack-plugin": "1.9.1",
    "vue": "^2.6.11",
    "vue-monaco": "^1.2.2",

I confimed verions of node.js is v14.17.3 and v16.5.0.

[Nishchit14]

Thank you @goofmint for sharing your solution. I wish this could be possible with all latest versions.

[Nishchit14]

I confirmed that it's working with the latest versions of webpack-plugins and monaco-editor.

"monaco-editor-webpack-plugin": "^4.0.0"
"monaco-editor": "^0.27.0"

problem was at react-monaco-editor, v0.34.0 works as the latest one v0.44.0 breaks

[alexdima]

I'm not sure where the problem is. I think this might be a problem with react-monaco-editor.