This is inbuilt into TypeScript unlike in JavaScript where variables declarations go into a global scope and if multiple JavaScript files are used within same project there will be possibility of overwriting or misconstruing the same variables, which will lead to the “global namespace pollution problem” in JavaScript. Actually, it’s comprised of 3 library projects and 3 test projects. No need of module loader. Recently there is a push towards using modules for almost everything. // In a .d.ts file or .ts file that is not a module. When first moving to a module-based organization, a common tendency is to wrap exports in an additional layer of namespaces. But they are still supported by using namespace over internal modules. Actually, it’s comprised of 3 library projects and 3 test projects. TypeScript is an open-source pure object-oriented programing language. namespaces are not a huge loss; the React community is firmly on-board with ES modules anyway, and that's the direction the TypeScript world is taking. That is, your code must refer to code in other files using imports and exports of the form import {foo} from 'bar'; Learn how your comment data is processed. A key feature of modules in TypeScript is that two different modules will never contribute names to the same scope. report. And, it was initially written using TypeScript namespaces, before TypeScript had support for ES modules. Both of them can be declared easily: There is a general explanation on how to use them on the TypeScript’s website. Namespaces can be a good way to structure your code in a Web Application, with all dependencies included as