javascriptnode.jsbabeljsbabel-node

Babel-node doesn't transform spread operator on preset env

I'm trying to use babel-node with nodemon for the hot-reloading. I've basically followed this repo.

My dev script in package.json looks like that:

"dev": "nodemon app.js --exec babel-node --presets env"

My .babelrc:

{
  "presets": ["env"]
}

Even though the spread operator is listed as supported by the env preset, when using it with this setup I get a

SyntaxError: Unexpected token

Solution

  • Install plugin-proposal-object-rest-spread.

    npm install --save-dev @babel/core @babel/plugin-proposal-object-rest-spread

    then change your .babelrc file:

    {
  "presets": ["@babel/preset-env"],
  "plugins": ["@babel/plugin-proposal-object-rest-spread"]
}