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77 lines
2.4 KiB
77 lines
2.4 KiB
2 years ago
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/**
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* Copyright 2018 Google Inc. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// If the loader is already loaded, just stop.
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if (!self.<%- amdFunctionName %>) {
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let registry = {};
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// Used for `eval` and `importScripts` where we can't get script URL by other means.
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// In both cases, it's safe to use a global var because those functions are synchronous.
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let nextDefineUri;
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const singleRequire = (uri, parentUri) => {
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uri = new URL(uri + ".js", parentUri).href;
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return registry[uri] || (
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<% if (useEval) { %>
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fetch(uri)
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.then(resp => resp.text())
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.then(code => {
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nextDefineUri = uri;
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eval(code);
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})
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<% } else { %>
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new Promise(resolve => {
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if ("document" in self) {
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const script = document.createElement("script");
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script.src = uri;
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script.onload = resolve;
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document.head.appendChild(script);
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} else {
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nextDefineUri = uri;
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importScripts(uri);
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resolve();
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}
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})
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<% } %>
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.then(() => {
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let promise = registry[uri];
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if (!promise) {
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throw new Error(`Module ${uri} didn’t register its module`);
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}
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return promise;
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})
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);
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};
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self.<%- amdFunctionName %> = (depsNames, factory) => {
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const uri = nextDefineUri || ("document" in self ? document.currentScript.src : "") || location.href;
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if (registry[uri]) {
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// Module is already loading or loaded.
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return;
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}
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let exports = {};
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const require = depUri => singleRequire(depUri, uri);
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const specialDeps = {
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module: { uri },
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exports,
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require
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};
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registry[uri] = Promise.all(depsNames.map(
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depName => specialDeps[depName] || require(depName)
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)).then(deps => {
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factory(...deps);
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return exports;
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});
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};
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}
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