typescript-challenge--questions-asnwers.ts

const questions = [
  {
    message: 'Enter your login (email address)...',
    name: 'login',
    type: 'input',
  },
  {
    message: 'Enter your password...',
    name: 'password',
    type: 'password',
  },
] as const;

type Input = string & { __brand: 'Input' };
type Password = string & { __brand: 'Password' };

type QuestionTypeToValueType = {
    input: Input;
    password: Password;
    price: number;
}

type Question = {
    readonly message: string;
    readonly name: string;
    readonly type: string;
}

type Answer<Q extends Question> = {[P in Q['name']]: Q['type']};

/**
 * type X = { login: "input" };
 */
type X = Answer<{ message: '', name: 'login', type: 'input' }>;

type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never;

type Simplify<T> = Pick<T, keyof T>

type Answers<Qs extends readonly Question[]> = Simplify<UnionToIntersection<{
    [I in keyof Qs]: Qs[I] extends Qs[number] ? Answer<Qs[I]> : never;
}[number]>>

/**
 * type Y = {
 *   login: 'input';
 *   password: 'password';
 * }
 */
type Y = Answers<typeof questions>;

// type Z = {
//     login: Input;
//     password: Password;
// }
type Z = { [K in keyof Y]: QuestionTypeToValueType[Y[K]] }

https://typescript-play.js.org/#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-Xt5XFlcR6bQGGZ9DyTMEg1Y9D7Cs4um4bvqmnHAQBVMCkz6dLjcCBIYAk8BKyuGnBSStqzVIbVKMB0gD80gA1sxKxpsIaAG4gVDKGDMMBIWc8acarXKTBSKQT01gABmYXa06wc4Xymno-ay55a5xMraAGVUBR7MJUEe+EqXp3NlQYAxz-fMxyQAQjxgf9nxgRNFUbFVMC3fsdxgIURUJJ5WzAXBKgAt8Py-H92xrV4QHrHgmxbUklQpPA7zNcDIMJCBbVY3B2mqFCB3uCBcAxLEeGqUd4OVPjOPw+9V3XbhcQEzFsW4fD9Wad1PRgb11gATSBL1yFzMxwxYaNkW2WEinM65TLxTTYx0hMFSopVWhAKDEGJUkIDLNSXQLNoAC09JdPz-EMjpi0aV1QrMq5EmYeFYSaEKVgrQKA1wABpQ8YGYtyYG09jdRwgEPm+X5-neXBtKym1UvwIA

simplified by @smith-chris

https://typescript-play.js.org/#code/JYOwLgpgTgZghgYwgAgIoFcIGczAPYjIDeAUMsgLbZZwDmEAXMjlKLQNxnIhxVMttO5MAE8ADo2ZhWIDiQC+JEggI5kAR0w58ILMgC8yANpdS5clSw16TAOQBRcNGQi86KMgA2eWqGQAKCAo4YE9kOAATCKhqAEoAOkTbABouch4+ZFtvXxAUtORRCTtQMXQwfPJ5VPIzc0trSQcnD1d3ZDE4KwB3PCgIxPjK8wymzp6+iOHhcTGurF7+4eqSAF1wvRVdME4SIpQAQV1u6AAeABUAPgNkc+QIAA9IEAi9DGxcAmQAfmJjAGlkH5zkZbKNbKtVkwQbZ9hDkPJkEwQBAAG7QXb7ZAAVRAOnOeAAki0sBAEJ8QKdsddDP5sfcnhAXno4CARD8AgBrJjY2IGa6ovDACJI7ho6B8x7PV4BfzcoEgGDOQl8-QCoURPm-QmilHoqCY2bIADKwAoYk8wBgIguNOQAAVgAhORdkshORBXDBbpdDRJkEcFtAsBcGdKWWy7abzZbrVS8QQCcTIFBSeSdKdAycoBcjCB0BQAEbQVaXMt+lAALRuWeDp32eG9mg+OiwvpIQA