All files index.js

100% Statements 20/20
100% Branches 10/10
100% Functions 3/3
100% Lines 15/15
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/*
  Copied from koa-compose
  License under MIT
  (c) koa-compose authors
 */
 
'use strict'
 
/**
 * Expose compositor.
 */
 
module.exports = compose
 
/**
 * Compose `middleware` returning
 * a fully valid middleware comprised
 * of all those which are passed.
 *
 * @param {Array} middleware
 * @return {Function}
 * @api public
 */
 
function compose (middleware) {
  if (!Array.isArray(middleware)) throw new TypeError('Middleware stack must be an array!')
  for (const fn of middleware) {
    if (typeof fn !== 'function') throw new TypeError('Middleware must be composed of functions!')
  }
 
  /**
   * @param {Object} context
   * @return {Promise}
   * @api public
   */
 
  return function (context, next) {
    // last called middleware #
    let index = -1
    return dispatch(0)
    function dispatch (i) {
      if (i <= index) return Promise.reject(new Error('next() called multiple times'))
      index = i
      let fn = middleware[i]
      if (i === middleware.length) fn = next
      if (!fn) return Promise.resolve()
      try {
        return Promise.resolve(fn(context, dispatch.bind(null, i + 1)))
      } catch (err) {
        return Promise.reject(err)
      }
    }
  }
}