/** Declare locally scoped properties on `globalThis`. When defining a global variable in a declaration file is inappropriate, it can be helpful to define a `type` or `interface` (say `ExtraGlobals`) with the global variable and then cast `globalThis` via code like `globalThis as unknown as ExtraGlobals`. Instead of casting through `unknown`, you can update your `type` or `interface` to extend `GlobalThis` and then directly cast `globalThis`. @example ``` import type {GlobalThis} from 'type-fest'; type ExtraGlobals = GlobalThis & { readonly GLOBAL_TOKEN: string; }; (globalThis as ExtraGlobals).GLOBAL_TOKEN; ``` @category Type */ export type GlobalThis = typeof globalThis;