UMD uses a single wrapper function to check for the presence of module.exports (indicating a CommonJS environment) and define.amd (indicating an AMD environment). If neither is found, it assumes it is running in a browser and attaches the module to the global window object.
Here is a simplified example of a UMD module:
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module.
define([], factory);
} else if (typeof module === 'object' && module.exports) {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory();
} else {
// Browser globals (root is window)
root.myModule = factory();
}
}(typeof self !== 'undefined' ? self : this, function () {
// Your module code goes here
var myModule = {};
myModule.hello = function () {
return 'Hello, world!';
};
return myModule;
}));
In the example case, the new code structure would be:
(function (global, factory) {
if (typeof define === "function" && define.amd) {
define(["exports"], factory);
} else if (typeof exports !== "undefined") {
factory(exports);
} else {
var mod = {
exports: {}
};
factory(mod.exports);
global.ULID = mod.exports;
}
})(this, function (exports) {
function ULID() {
...
}
function generator(){
var ulid = new ULID()
return ulid()
}
exports.generator = generator;
});
