In this case, ES6 solved the problem of modularization for us by doing a good job, so we don’t need any namespace at all in common programs (unless … The MSDN reference on namespaces (including Namespace Global) is here: Namespaces in Visual Basic. TypeScriptコンパイラがこの型を認識できるように、Ambient Namespace宣言を使用します。 例えば、下記のようにしてこれを書き始めることができます。 D3.d.ts (簡略化のために抜粋) NOTE: A namespace can span in multiple files and allow to concatenate each file using "-outFile" as they were all defined in one place. 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. For the TypeScript compiler to see this shape, we use an ambient namespace declaration. The namespace is used for logical grouping of functionalities. A reference to a global variable for which there is a TypeScript type annotation suggesting that it contains the namespace object of a module. “External modules” are now simply “modules”, as to align with ECMAScript 2015’s terminology, (namely that module X {is equivalent to the now-preferred namespace … ThisType A this type in a specific class or interface. This pattern is somewhat dangerous due to the possibility of runtime conflicts, but we can still write a declaration file for it. TypeScript automatically works in them all, but you need to make some minor modifications to the project to get things going. A namespace is a way which is used for logical grouping of functionalities with local scoping. A TypeScript module can say export default myFunction to export just one thing. It is commonly used to add namespace restrictions to variables when using global variables to avoid polluting the global space. As an aside, I’d like to thank Shimmy Wietzhandler for requesting this feature in Microsoft Connect , and also the people who emailed or who wrote in with comments to … Because this library is loaded through a