Creating a Namespace in TypeScript Declaration Files
Learn how to create a namespace in TypeScript declaration files to group functions and properties of classes together.
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When writing declaration files, we need a way of grouping functions and properties
of classes under the class name. TypeScript uses the module keyword as a means of creating a namespace so that all functions or properties of a class can be grouped together within the class namespace.
Creating a namespace
Let’s take a look at the first version of a declaration file for our ErrorHelper JavaScript
class in the file named globals.d.ts:
declare module ErrorHelper {function containsErrors(response: any): boolean; // checks if response contains any errorsfunction trace(message: any): void; // logs a message for debugging purposes}
Namespace declaration
Here, we use the declare keyword combined with the module keyword to
define a namespace named ErrorHelper on ...