What steps can be taken to resolve the Typescript errors related to the window object in my Vue application?

Within my Vue 3 app component, I need to interact with custom properties on the Window object, as shown below:

window.ZohoHCAsapSettings = { //<-- ERROR HERE
  ticketsSettings: {
    preFillFields: {
      email: {
        defaultValue: user.value?.email,
      },
    },
  },
};

However, when trying to access ZohoHCAsapSettings, I encounter a TypeScript error:

Property 'ZohoHCAsapSettings' does not exist on type 'Window & typeof globalThis'. ts(2339)

To address this issue, I attempted to extend the window object like so:

interface customWindow extends Window {
  ZohoHCAsapSettings?: unknown;
}
declare const window: customWindow; //<-- ERROR HERE
window.ZohoHCAsapSettings = {
  ticketsSettings: {
    preFillFields: {
      email: {
        defaultValue: user.value?.email,
      },
    },
  },
};

This resolves the error related to ZohoHCAsapSettings, but now I encounter a new error on the declare keyword:

Modifiers cannot appear here. ts(1184)

As a newcomer to TypeScript, I'm unsure about the cause of this issue.

For context, I am using Visual Studio Code as my IDE.

Any insights or solutions would be greatly appreciated.

Answer №1

It was noted by @Buszmen that the global Window interface needs to be extended with a new property. Typically, type declarations are kept in their own .d.ts file (for example, src/globals.d.ts for global variables).

If you're working on a project created using npm init vue, npm init vite, or Vue CLI, remember to define the global namespace:

// src/globals.d.ts
declare global {
  interface Window { ZohoHCAsapSettings?: unknown; }
}

Answer №2

Have you considered trying it like this:

interface Window { ZohoHCAsapSettings?: unknown; }

See it in action here: TS Playground

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