gensync | Allows users to use generators

Hyy, [update]

installing babel locally

• npm i @babel/core @babel/cli @babel/preset-env

• Inside package.json add npm script

Your problem comes from an incorrect .babelrc file, please look at it closer - you are defining babel to use "2015" preset but your dependencies point that you are using "@babel/preset-env".

The correct replacement for "2015" is "@babel/preset-env" in your case. Read about it more: https://babeljs.io/docs/en/babel-preset-env

.babelrc

I found the solution. Inside package.json I added the require for mocha:

I figured out that it's most likely babel issue. If you faced this issue like I had, upgrading libraries, just rollback to the older version that works, and upgrade libraries one by one. I reproduced this issue after I upgraded @babel/core. I just rolled back again and never touched babel again. Still works fine.

The babel key in your package.json is for Babel 6.x and references plugins that you do not have installed, which is why you are getting that error.

@babel/preset-env and @babel/preset-react will accomplish likely everything you need to worry about, so as long as those are installed and referenced in the Webpack config, you're good to go.

I think the problem is that your package.json says you are using ES6 modules, but your Babel config is using module.exports which is CommonJS (not ES6 modules).

I renamed my babel.config.js to babel.config.cjs and this fixed the problem. I guess you could also change module.exports to export default but I haven't tried this.

In a Vue CLI project, your Webpack configuration goes in vue.config.js in your project root, not babel.config.js. If that file doesn't exist, you should create it and put your devServer configuration in it.

From the docs:

vue.config.js is an optional config file that will be automatically loaded by @vue/cli-service if it's present in your project root (next to package.json). You can also use the vue field in package.json, but do note in that case you will be limited to JSON-compatible values only.

vue.config.js (Not babel.config.js)

Webpacker changed from using .babelrc to babel.config.js between major versions 3 and 4. (Here is a link to the changelog where that is mentioned.) If this error pops up after the upgrade, it likely means that the legacy .babelrc file is still in the root of the Rails app. The solution is to delete .babelrc.

For those of you who are still wandering around to find answer to above question. Issue was in the library itself convert-source-map which needed to handle this exception.

I forked the actual repository and handled that exception in line 64 toBase64 method. Now the method looks like something