TypeScript - Pick utility-type real-world example

index.ts

export type User = {
  /** Unix timestamp - created at time of write */
  timestamp: number
  /** ID of the user - created at time of write */
  id: string
  telegramUsername: string
  telegramUserId: string
  /** Like a nickname */
  preferredName: string
  firstName: string
  lastName: string
  timezone: string
  twitterHandle: string
  stripeCustomerId: string
  /** IDs the user is in - comma separated string */
  groupIds: string
}

// Using a serverless function with Vercel's /api routes
export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method === "POST") {
    try {
      const {
        telegramUsername,
        preferredName,
        timezone,
        twitterHandle,
        stripeCustomerId,
        groupIds,
      }: Pick<
        User,
        | "telegramUsername"
        | "preferredName"
        | "timezone"
        | "twitterHandle"
        | "stripeCustomerId"
        | "groupIds"
      > = req.body

      const user: User = {
        timestamp: Date.now(),
        id: uuidv4(),
        telegramUsername,
        preferredName,
        timezone,
        twitterHandle,
        stripeCustomerId,
        groupIds,
        firstName: "",
        lastName: "",
        telegramUserId: "",
      }

      await writeUserToDatabase(user)

      res.status(200).json({ success: true })
    } catch (err) {
      res.status(500).json({ statusCode: 500, message: err.message })
    }
  }
}

// Read more here: https://www.typescriptlang.org/docs/handbook/utility-types.html#picktype-keys