replace-object-strings.ts

const replaceObjectStrings = <T extends object>(
	data: T,
	from: string | RegExp,
	to: string
): T =>
	Object.fromEntries(
		Object.entries(data).map(([key, value]) => {
			if (value === null) return [key, null]

			switch (typeof value) {
				case 'string':
					return [key, value.replace(from, to)]
				case 'object':
					return [key, replaceObjectStrings(value, from, to)]
				default:
					throw new Error('Unsupported Data Type')
			}
		})
	)

console.log(replaceObjectStrings({ a: { b: 'top.kek' } }, '.', '###'))