86 lines
2.7 KiB
JavaScript
86 lines
2.7 KiB
JavaScript
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(function () {
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/*
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* SystemJS named register extension
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* Supports System.register('name', [..deps..], function (_export, _context) { ... })
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*
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* Names are written to the registry as-is
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* System.register('x', ...) can be imported as System.import('x')
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*/
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(function (global) {
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var System = global.System;
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setRegisterRegistry(System);
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var systemJSPrototype = System.constructor.prototype;
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var constructor = System.constructor;
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var SystemJS = function () {
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constructor.call(this);
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setRegisterRegistry(this);
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};
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SystemJS.prototype = systemJSPrototype;
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System.constructor = SystemJS;
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var firstNamedDefine, firstName;
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function setRegisterRegistry(systemInstance) {
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systemInstance.registerRegistry = Object.create(null);
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systemInstance.namedRegisterAliases = Object.create(null);
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}
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var register = systemJSPrototype.register;
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systemJSPrototype.register = function (name, deps, declare, metas) {
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if (typeof name !== 'string')
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return register.apply(this, arguments);
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var define = [deps, declare, metas];
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this.registerRegistry[name] = define;
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if (!firstNamedDefine) {
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firstNamedDefine = define;
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firstName = name;
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}
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Promise.resolve().then(function () {
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firstNamedDefine = null;
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firstName = null;
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});
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return register.apply(this, [deps, declare, metas]);
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};
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var resolve = systemJSPrototype.resolve;
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systemJSPrototype.resolve = function (id, parentURL) {
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try {
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// Prefer import map (or other existing) resolution over the registerRegistry
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return resolve.call(this, id, parentURL);
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} catch (err) {
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if (id in this.registerRegistry) {
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return this.namedRegisterAliases[id] || id;
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}
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throw err;
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}
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};
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var instantiate = systemJSPrototype.instantiate;
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systemJSPrototype.instantiate = function (url, firstParentUrl, meta) {
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var result = this.registerRegistry[url];
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if (result) {
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this.registerRegistry[url] = null;
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return result;
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} else {
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return instantiate.call(this, url, firstParentUrl, meta);
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}
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};
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var getRegister = systemJSPrototype.getRegister;
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systemJSPrototype.getRegister = function (url) {
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// Calling getRegister() because other extras need to know it was called so they can perform side effects
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var register = getRegister.call(this, url);
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if (firstName && url) {
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this.namedRegisterAliases[firstName] = url;
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}
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var result = firstNamedDefine || register;
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firstNamedDefine = null;
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firstName = null;
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return result;
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};
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})(typeof self !== 'undefined' ? self : global);
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})();
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