在小型节点项目上使用带有 preset-env 的 babel，无法将 import/export 语句转换为 commonjs

Question

I'm trying to set up a node project so I can use the common import/export syntax, and for compatibility, use babeljs to convert the import and export statements to require s.

When I try transpiling using babel though, I'm not seeing any changes and I don't know why.

Here's my babel.config.js

// babel.config.js
module.exports = {
  // I thought this was what I would need to add for making the changes, based on the docs
  plugins: ["@babel/plugin-transform-modules-commonjs"],


  // env takes care of the majority of changes I might need to convert code to make
  // easy to run on a wider range of machines
  presets: [
    [
      "@babel/preset-env",
      {
        targets: {
          // target an older version where I know there is no ESM support
          node: "10"
        }
      }
    ]
  ],
  // this was in the docs too - I'm not sure if  I need it TBH
  sourceType: "module"
}

I have a bunch of code using import/export , and async/await in a directory, that I wanted to transpile and put into another directory, lib .

Here's the command I am using:

npx babel src --out-dir lib

My package.json file online too, and there's nothing too esoteric there. I've tried to follow the documentation faithfully.

I would expect to see changes in the code to replace the import/export calls with requires in the lib, but no joy.

What am I doing wrong here? I worked on a related project 6-7 months ago, where I am using babel like this and it does make the changes for me.

You can see the branch with the problem code on github , with the package.json , and here's the source code for other project mentioned where it is working .

Please be gentle, fellow SO commenters - I'm trying my best, I really am.

Answer 1

It looks like you're using "babel-cli": "^6.26.0" instead of "@babel/cli": "^7.11.6" that should fix it.