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babel-plugin-mix-import-module-exports

v0.1.1

Published

Fix mixed use ES6 imports and Common.js exports

Downloads

243

Readme

babel-plugin-mix-import-module-exports

Why we use it

When mixed use import and module.exports:

import A from 'a';
// ...
module.exports = A

it will lead to problems with bundling like this:

TypeError: Cannot assign to read only property 'exports' of object '#<Object>'

For more infomation, see these issues:

https://github.com/almende/vis/issues/2934

https://github.com/webpack/webpack/issues/4039#issuecomment-281136701

https://github.com/webpack/webpack/issues/3491

https://stackoverflow.com/questions/42449999/webpack-import-module-exports-in-the-same-module-caused-error

How it works

This plugin makes things work by transforming the code into:

var __MIX_IMPORT_MODULE_EXPORTS__;
import A from 'a';
// ...
__MIX_IMPORT_MODULE_EXPORTS__ = A;
export default __MIX_IMPORT_MODULE_EXPORTS__;

or sometimes maybe we have multiple module.exports in our module:

var __MIX_IMPORT_MODULE_EXPORTS__;
import A from 'a';
import B from 'b';
// ...
if (B) {
  __MIX_IMPORT_MODULE_EXPORTS__ = B;
} else {
  __MIX_IMPORT_MODULE_EXPORTS__ = A;
}
export default __MIX_IMPORT_MODULE_EXPORTS__;

Important Note

This plugin is just for compatibility with old projects, you should not use it in your new projects.