A module format is the syntax we use to define a module. For unit tests, one could additionally make some of the internals available via named exports. You'll still get syntax errors shown in the DevTools, but you'll not be able to use some of the debugging techniques you might have expected to use. You had to use some third-party tools such as RequireJS or SystemJS to add support for modules. Let's take a look at an example. Also, I will be using namespace imports(demo). In our first example (see basic-modules) we have a file structure as follows: Note: All of the examples in this guide have basically the same structure; the above should start getting pretty familiar. This allows you to dynamically load modules only when they are needed, rather than having to load everything up front. Some restrictions apply to module specifiers in browsers. It has therefore made sense in recent years to start thinking about providing mechanisms for splitting JavaScript programs up into separate modules that can be imported when needed. let company = "TutorialsPoint" let getCompany = function() { return company.toUpperCase() } let setCompany = function(newValue) { company = newValue } export {company,getCompany,setCompany} Step 2 − Create a file company2.js. In the above example, require() function returns an object because http module returns its functionality as an object, you can then use its properties and methods using dot notation e.g. A module system would have been overkill, so JavaScript … Modules that declare a single entity, e.g. return `Hola, ${user}!`; Native JavaScript Modules. First, we install the HTTP module. Inside each module, therefore, 'module' refers to the object representing the current module. AMD, CommonJS). The good news is that modern browsers have started to support module functionality natively, and this is what this article is all about. Inside your import and export statement's curly braces, you can use the keyword as along with a new feature name, to change the identifying name you will use for a feature inside the top-level module. This form of usage is called a named export because while exporting you are defining the name of the objects being exported. The web browsers load and execute the script modules automatically. The functionality we've exported so far has been comprised of named exports — each item (be it a function, const, etc.) These examples demonstrate a simple set of modules that create a