babel-plugin-default-import-checker

Babel 6 plugin to check if your using default imports and namespace imports on local modules that exports (or not) default bindings.

This plugin only work on module transformed with Babel, it won't show any error for imports on node_modules modules.

Usage

npm install --save-dev babel-plugin-default-import-checker

then in you .babelrc file

{
  "plugins": [
    "babel-plugin-default-import-checker"
  ]
}

or just run a babel-cli command with a --plugins option

babel --plugins babel-plugin-default-import-checker src --out-dir lib

What it does

Detect module without default binding being imported as default import

If you define the following module

export function hello() {
  return 'Hello World!';
}

and use import it from elsewhere like it's a default binding

import Hello from './hello';

const message = Hello();

console.log(message);

the babel-plugin-default-import-checker will display the following error

ERROR : module 'example/index.js' try to use default binding
 | of module 'example/hello.js' at line [1] but there is none.
 | 1 > import Hello from './hello';
 | You should add a default binding to 'example/hello.js'
 | or use the following import :
 | 1 > import * as Hello from  './hello';

Detect module with default imports being imported as namespace import

if you define the following module

export default function hi() {
  return 'Hello World!';
}

and use import it using namespace import

import * as Hi from './hi';

console.log(Hi.hi());

the babel-plugin-default-import-checker will display a warning unless there is other exported functions in the imported module.

WARNING : module 'example/index.js' is using namespace import of module 'example/hi.js'
 | at line [1] but this module has default export. Maybe it's an error.
 | 1 > import * as Hi from './hi';