node_modules/before-after-hook/lib/register.js

module.exports = register;

function register(state, name, method, options) {
  if (typeof method !== "function") {
    throw new Error("method for before hook must be a function");
  }

  if (!options) {
    options = {};
  }

  if (Array.isArray(name)) {
    return name.reverse().reduce(function (callback, name) {
      return register.bind(null, state, name, callback, options);
    }, method)();
  }

  return Promise.resolve().then(function () {
    if (!state.registry[name]) {
      return method(options);
    }

    return state.registry[name].reduce(function (method, registered) {
      return registered.hook.bind(null, method, options);
    }, method)();
  });
}