can-util/js/import/import.js

Common utilities for CanJS projects

'use strict';

var isFunction = require('../is-function/is-function');
var global = require('can-globals/global/global')();
var namespace = require("can-namespace");

/**
 * @module {function} can-util/js/import/import import
 * @parent can-util/js
 * @signature `importModule(moduleName, parentName)`
 *
 * ```js
 * var importModule = require("can-util/js/import/import");
 *
 * importModule("foo.stache").then(function(){
 *   // module was imported
 * });
 * ```
 *
 * @param {String} moduleName The module to be imported.
 * @param {String} [parentName] A parent module that will be used as a reference for resolving relative module imports.
 * @return {Promise} A Promise that will resolve when the module has been imported.
 */

module.exports = namespace.import = function(moduleName, parentName) {
	return new Promise(function(resolve, reject) {
		try {
			if(typeof global.System === "object" && isFunction(global.System["import"])) {
				global.System["import"](moduleName, {
					name: parentName
				}).then(resolve, reject);
			} else if(global.define && global.define.amd){
				global.require([moduleName], function(value){
					resolve(value);
				});
			} else if(global.require){
				resolve(global.require(moduleName));
			} else {
				// steal optimized build
				if (typeof stealRequire !== "undefined") {
					steal.import(moduleName, { name: parentName }).then(resolve, reject);
				} else {
					// ideally this will use can.getObject
					resolve();
				}
			}
		} catch(err) {
			reject(err);
		}
	});
};