Here's a TypeScript type that achieves what you want:

type AnyObject = {
  [key: string]: AnyObject | any | undefined
}

This recursive type definition ensures:

• Any key access requires optional chaining if you want to access nested properties
• Direct access without optional chaining will trigger the possibly undefined error
• Supports nested objects, arrays, and functions

Example usage:

const obj: AnyObject = {}

obj.a?.b?.c         // ✓ OK
obj.a.b.c          // ✗ Error: Object is possibly undefined
obj.fn?.()         // ✓ OK
obj.arr?.[0]?.prop // ✓ OK