babel-preset-env

0.0.4 • Public • Published

babel-preset-env npm travis

Babel preset for all envs.

Install

$ npm install --save-dev babel-preset-env

Usage via .babelrc

Options

  • targets - an object of browsers/environment versions to support (ex: chrome, node, etc).

The data for this is currently at: /data/plugins.json and being generated by /scripts/build-data.js using https://kangax.github.io/compat-table.

We would like help to make the data is correct! This just means usage/testing!

Currently: "chrome, edge, firefox, safari, node"

Some node features are > 6.5

  • loose (boolean) - Enable "loose" transformations for any plugins in this preset that allow them (Disabled by default).
  • modules - Enable transformation of ES6 module syntax to another module type (Enabled by default to "commonjs").
    • Can be false to not transform modules, or one of ["amd", "umd", "systemjs", "commonjs"]
  • debug (boolean) - console.log out the targets and plugins being used as well as the version specified in /data/plugins.json
{
  "presets": [
    ["env", {
      "targets": {
        "chrome": 52
      },
      "loose": true,
      "modules": false
    }]
  ]
}

Example

// src
export class A {}
// default is to run all transforms
{
  "presets": [
    ["env", {}]
  ]
}

// ...

var A = exports.A = function A() {
  _classCallCheck(this, A);
};
// target chrome 52
{
  "presets": [
    ["env", {
      "targets": {
        "chrome": 52
      }
    }]
  ]
}

// ...

class A {}
exports.A = A;
// target chrome 52 with webpack 2/rollup
{
  "presets": [
    ["env", {
      "targets": {
        "chrome": 52
      },
      "modules": false
    }]
  ]
}

// ...

export class A {}

Example with debug: true

Using targets: {
  "node": 6.5
}

Using plugins:

module: false
transform-exponentiation-operator {}
transform-async-to-generator {}
syntax-trailing-function-commas {}

Readme

Keywords

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Package Sidebar

Install

npm i babel-preset-env@0.0.4

Homepage

babeljs.io/

Version

0.0.4

License

MIT

Last publish

Collaborators

  • hzoo
  • loganfsmyth
  • existentialism