babel-plugin-add-import-extension

babel-plugin-add-import-extension

A plugin to add extensions to import and export declarations, is very useful when you use Typescript with Babel and don't want to explicity import or export module with extensions.

How to install:

# using npm
npm install --save-dev babel-plugin-add-import-extension
# usin yarn
yarn add -D babel-plugin-add-import-extension

Add to your plugins on your babel config file:

plugins: ['babel-plugin-add-import-extension'] // defaults to .js extension

Is possible to set the extension when you set the plugin:

plugins: [
    ['babel-plugin-add-import-extension', { extension: 'jsx' }] // will add jsx extension
  ]

You can also replace existing extensions with the one you want

plugins: [
    ['babel-plugin-add-import-extension', { extension: 'jsx', replace: true }] // will add jsx extension
  ]

Let's the transformation begin :)

A module import without extension:

import { add, double } from './lib/numbers'

will be converted to:

import { add, double } from './lib/numbers.js'

A module export without extension:

export { add, double } from './lib/numbers'

will be converted to:

export { add, double } from './lib/numbers.js'

If you add the replace:true option, extensions will be overwritten like so

import { add, double } from './lib/numbers.ts'

will be converted to:

import { add, double } from './lib/numbers.js'

and

export { add, double } from './lib/numbers.ts'

will be converted to:

export { add, double } from './lib/numbers.js'

What this plugin does is to check all imported modules and if your module is not on node_module it will consider that is a project/local module and add the choosed extension, so for node modules it don't add any extension.

I made this plugin for personal use on my typescript boilerplate, but if a lot of people start to use I can better documentation ;)