The UMD module 1) format try to be the glue between differents modules definition by offering template 2)
A UMD module wraps the following module format:
You can the use UMD module in a AMD (requireJs), CommonJs (node) or Global Variable environment (browser)
UMD modules check for the existence of a module loader environment with the following code (where root is the global scope. It may be window)
Example from Template commonjsStrict.js:
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define(['exports', 'b'], factory);
} else if (typeof exports === 'object' && typeof exports.nodeName !== 'string') {
// CommonJS
factory(exports, require('b'));
} else {
// Browser globals
factory((root.commonJsStrict = {}), root.b);
}
}(this, function (exports, b) {
//use b in some fashion.
// attach properties to the exports object to define
// the exported module properties.
exports.action = function () {};
}));
At the top of the file, it’s almost always a UMD library when you see tests as:
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.d3 = global.d3 || {})));
}(this, (function (exports) { 'use strict';
var version = "4.10.2";
// .........
// ........
exports.version;
exports.myFunction = myFunction;
Object.defineProperty(exports, '__esModule', { value: true });
})));