import-all.macro

A babel-plugin-macro that allows you to import all files that match a glob

The problem

You want to import all files that match a glob without having to import them individually.

This solution

This is a babel-plugin-macro which allows you to import files that match a glob. It supports import statements for synchronous resolution as well as dynamic import() for deferred resolution (for code splitting with react router for example).

Installation

This module is distributed via npm which is bundled with node and should be installed as one of your project's devDependencies:

npm install --save-dev import-all.macro

Usage

Once you've configured babel-plugin-macros you can import/require import-all.macro.

The importAll functions accept a glob and will transpile your code to import statements/dynamic imports for each file that matches the given glob.

Let's imagine you have a directory called my-files with the files a.js, b.js, c.js, and d.js.

Here are a few before/after examples:

importAll uses dynamic import: README:1 importAll uses dynamic import

import importAll from 'import-all.macro'

document.getElementById('load-stuff').addEventListener('click', () => {
  importAll('./files/*.js').then(all => {
    console.log(all)
  })
})

      ↓ ↓ ↓ ↓ ↓ ↓

document.getElementById('load-stuff').addEventListener('click', () => {
  Promise.all([
    import('./files/a.js'),
    import('./files/b.js'),
    import('./files/c.js'),
    import('./files/d.js'),
  ])
    .then(function importAllHandler(importVals) {
      return {
        './files/a.js': importVals[0],
        './files/b.js': importVals[1],
        './files/c.js': importVals[2],
        './files/d.js': importVals[3],
      }
    })
    .then(all => {
      console.log(all)
    })
})

importAll.sync uses static imports: README:2 importAll.sync uses static imports

import importAll from 'import-all.macro'

const a = importAll.sync('./files/*.js')

      ↓ ↓ ↓ ↓ ↓ ↓

import * as _filesAJs from './files/a.js'
import * as _filesBJs from './files/b.js'
import * as _filesCJs from './files/c.js'
import * as _filesDJs from './files/d.js'
const a = {
  './files/a.js': _filesAJs,
  './files/b.js': _filesBJs,
  './files/c.js': _filesCJs,
  './files/d.js': _filesDJs,
}

importAll.deferred gives an object with dynamic imports: README:3 importAll.deferred gives an object with dynamic imports

import importAll from 'import-all.macro'

const routes = importAll.deferred('./files/*.js')

      ↓ ↓ ↓ ↓ ↓ ↓

const routes = {
  './files/a.js': function () {
    return import('./files/a.js')
  },
  './files/b.js': function () {
    return import('./files/b.js')
  },
  './files/c.js': function () {
    return import('./files/c.js')
  },
  './files/d.js': function () {
    return import('./files/d.js')
  },
}

Configure importAll to transform import path before generating imports

babel-plugin-macros.config.js:

module.exports = {
  importAll: {
    transformModulePath(modulePath, importingPath) {
      const projectRoot = path.join(__dirname, '../../')
      const modulePathWithoutExt = modulePath.replace(/\.js$/, '')
      const absolutePath = path.resolve(
        path.dirname(importingPath),
        modulePathWithoutExt,
      )
      const pathRelativeToRoot = path.relative(projectRoot, absolutePath)
      return pathRelativeToRoot
    },
  },
}

import importAll from 'import-all.macro'
const a = importAll.sync('./files/*.js')
      ↓ ↓ ↓ ↓ ↓ ↓
import * as _filesA from './files/a'
import * as _filesB from './files/b'
import * as _filesC from './files/c'
import * as _filesD from './files/d'
const a = {
  './files/a': _filesA,
  './files/b': _filesB,
  './files/c': _filesC,
  './files/d': _filesD,
}

Caveats

Some static analysis tools (like ESLint, Flow, and Jest) wont like this very much without a little additional work. So Jest's watch mode may not pick up all your tests that are relevant based on changes and some ESLint plugins (like eslint-plugin-import) will probably fail on this.