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2
 
 
 
 
 
2
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
'use strict';
 
var core = require('../'),
    isArray = require('lodash/isArray'),
    isFunction = require('lodash/isFunction'),
    isObjectLike = require('lodash/isObjectLike');
 
 
module.exports = function (options) {
 
    var errorText = 'Please verify options'; // For better minification because this string is repeating
 
    if (!isObjectLike(options)) {
        throw new TypeError(errorText);
    }
 
    if (!isFunction(options.request)) {
        throw new TypeError(errorText + '.request');
    }
 
    if (!isArray(options.expose) || options.expose.length === 0) {
        throw new TypeError(errorText + '.expose');
    }
 
 
    var plumbing = core({
        PromiseImpl: options.PromiseImpl,
        constructorMixin: options.constructorMixin
    });
 
 
    // Intercepting Request's init method
 
    var originalInit = options.request.Request.prototype.init;
 
    options.request.Request.prototype.init = function RP$initInterceptor(requestOptions) {
 
        // Init may be called again - currently in case of redirects
        if (isObjectLike(requestOptions) && !this._callback && !this._rp_promise) {
 
            plumbing.init.call(this, requestOptions);
 
        }
 
        return originalInit.apply(this, arguments);
 
    };
 
 
    // Exposing the Promise capabilities
 
    var thenExposed = false;
    for ( var i = 0; i < options.expose.length; i+=1 ) {
 
        var method = options.expose[i];
 
        plumbing[ method === 'promise' ? 'exposePromise' : 'exposePromiseMethod' ](
            options.request.Request.prototype,
            null,
            '_rp_promise',
            method
        );
 
        if (method === 'then') {
            thenExposed = true;
        }
 
    }
 
    if (!thenExposed) {
        throw new Error('Please expose "then"');
    }
 
};