Web Reference: Oct 3, 2012 · Basically, you need to extend the existing window interface to tell it about your new property. If you are getting an error where the window property is still not picking up from a .d.ts file, you may need to add export {} to the file. We should probably use an optional property like this: interface Window { MyNamespace?: any; } Feb 27, 2024 · The "Property does not exist on type 'Window & typeof globalThis'" error occurs when we access a property that doesn't exist on the Window interface. To solve the error, extend the Window interface in a .d.ts file and add the property you intend to access on the window object. Jul 23, 2025 · This is done by explicitly defining the window interface and adding a new property to be used within it. Example: The below code example explains how you can extend the window interface to set a new property on the window in TypeScript.
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