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Extending window and document global objects in TypeScript

Stanislav KhromovStanislav Khromov

Sometimes you will run into cases where a library or other code adds things to the global window or document objects and TypeScript will complain if it’s not aware of these properties. This will lead to a dreaded “property does not exist” error from the TypeScript compiler. To fix this you can type them yourself easily!

Let’s say that we have a window.clicks property that is a number, we can type it like this:

interface Window {
  clicks: number;

Or let’s say we have a document.items which is an array of strings, we can type it like this:

interface Document {
  items: string[];

Now you can happily use them in your code without TypeScript complaining:


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