Nuxt/examples/coffeescript/modules/coffeescript.js

export default function () {
  // Add .coffee extension for store, middleware and more
  this.nuxt.options.build.additionalExtensions.push('coffee')
  // Extend build
  const coffeeLoader = {
    test: /\.coffee$/,
    loader: 'coffee-loader'
  }
  this.extendBuild((config) => {
    // Add CoffeeScruot loader
    config.module.rules.push(coffeeLoader)
    // Add .coffee extension in webpack resolve
    if (!config.resolve.extensions.includes('.coffee')) {
      config.resolve.extensions.push('.coffee')
    }
  })
}