@webpack-blocks/happypack - Concept

happypack.js

const { group } = require('@webpack-blocks/core')

module.exports = happypack

function happypack (blocks) {
  return group(blocks.map(happyfyBlock))
}

/**
 * Returns a new block wrapping `block` that creates a happypack loader config.
 */
function happyfyBlock (block) {
  const happyBlock = happyfySetter(block)
  const pre = toArray(block.pre)
  const post = toArray(block.post).map(postHook => happyfySetter(postHook))

  return Object.assign(happyBlock, { pre, post })
}

/**
 * Takes a block or a post hook and returns a wrapping function that creates a happypack loader config.
 */
function happyfySetter (setter) {
  return (context, config) => happyfyConfig(setter(context, config), context)
}

/**
 * Transforms a non-happypack loader config into a happypack loader config.
 */
function happyfyConfig (configSnippet, context) {
  // TODO: If `module.loaders` is set then transform according to https://github.com/amireh/happypack#using-multiple-instances
}

/**
 * Takes an array, a function or something falsy and returns the array, the
 * function wrapped in an array or an empty array, respectively.
 */
function toArray (value) {
  if (value) {
    return Array.isArray(value) ? value : [ value ]
  } else {
    return []
  }
}