minimemo.ts

minimemo.ts

export async function memo<Value>(
	key: string,
	loader: () => Value | Promise<Value>
) {
	const g = global as unknown as {
		memory: Record<string, { value: Value | Promise<Value>; timestamp: number }>
	}
	const memory = g.memory ?? {}
	g.memory = memory

	const now = new Date().getTime()

	const old = now - 30 * 1000

	if (g.memory[key]?.timestamp > old) {
		return g.memory[key].value as Value
	}

	const value = loader()
	g.memory[key] = { value, timestamp: new Date().getTime() }
	return value
}