Let's say I want to use Immutable in my project (or any given npm package). I have npm install
ed it, so it is in node_modules
. Of course, it has CommonJS exports there. I, however, want to use es6 modules in my project.
I am using Webpack to compile it all together, with the 6to5-loader to deal with es6 module syntax.
In my source file, I say import Immutable from 'immutable';
--- but this causes a problem because the es6 import
is looking for an es6 default
to have been exported, which isn't the case (for Immutable or probably almost any other npm package). The compiled code ends up looking like this: var Immutable = require('immutable')["default"];
--- which of course throws an error, since there is no default
property to find.
Can I consume the npm packages with es6 modules?
Create your scripts in package. json : "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "build": "webpack", "start": "webpack-dev-server --open" }, Run npm run build and npm start .
This section covers all methods available in code compiled with webpack. When using webpack to bundle your application, you can pick from a variety of module syntax styles including ES6, CommonJS, and AMD.
Babel.js contributor here. You're looking for the following:
import * as Immutable from 'immutable'; // compiles to: var Immutable = require('immutable');
Interactive demo
Note: This is with either the
common
orcommonInterop
modules option. For others, see: https://babeljs.io/docs/usage/modules/
Just figured it out. (The solution is tool-specific --- but es6 modules only exist now insofar as they are tool-enabled, so I think that's enough of an "answer".)
6to5's default module transpilation uses the common
option, which results in the very problem I griped about above. But there is another option: commonInterop
--- which must have been built to deal with exactly the situation I'm dealing with. See https://6to5.github.io/modules.html#common-interop
So three cheers for 6to5.
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