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