TS type with indexed object and version property

indexed.ts

// TypeScript type for an object with 1 property that is required but different then other properties

type Todo = { id: string; text: string; done: boolean }

type Table = Array<Record<string, unknown>>

type Schema = (
	| {
			[key: string]: Table
	  }
	| {
			version: number
	  }
) &
	Required<{ version: number }>

const doc: Schema = {
	version: 1, // enforce that it is defined
	todos: [] as Todo[], // other properties
}