index.js

var register = require('./lib/register')
var addHook = require('./lib/add')
var removeHook = require('./lib/remove')

// bind with array of arguments: https://stackoverflow.com/a/21792913
var bind = Function.bind
var bindable = bind.bind(bind)

function bindApi (hook, state, name) {
  var removeHookRef = bindable(removeHook, null).apply(null, name ? [state, name] : [state])
  hook.api = { remove: removeHookRef }
  hook.remove = removeHookRef

  ;['before', 'error', 'after', 'wrap'].forEach(function (kind) {
    var args = name ? [state, kind, name] : [state, kind]
    hook[kind] = hook.api[kind] = bindable(addHook, null).apply(null, args)
  })
}

function HookSingular () {
  var singularHookName = 'h'
  var singularHookState = {
    registry: {}
  }
  var singularHook = register.bind(null, singularHookState, singularHookName)
  bindApi(singularHook, singularHookState, singularHookName)
  return singularHook
}

function HookCollection () {
  var state = {
    registry: {}
  }

  var hook = register.bind(null, state)
  bindApi(hook, state)

  return hook
}

var collectionHookDeprecationMessageDisplayed = false
function Hook () {
  if (!collectionHookDeprecationMessageDisplayed) {
    console.warn('[before-after-hook]: "Hook()" repurposing warning, use "Hook.Collection()". Read more: https://git.io/upgrade-before-after-hook-to-1.4')
    collectionHookDeprecationMessageDisplayed = true
  }
  return HookCollection()
}

Hook.Singular = HookSingular.bind()
Hook.Collection = HookCollection.bind()

module.exports = Hook
// expose constructors as a named property for TypeScript
module.exports.Hook = Hook
module.exports.Singular = Hook.Singular
module.exports.Collection = Hook.Collection