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AI solution for TypeScript puzzle on
61. implement Prefix<T, P>

To solve this problem, we can use mapped types and template literal types in TypeScript. Here's the implementation:

type Prefix<T, P extends string> = {  [K in keyof T as `${P}_${K}`]: T[K];};


  1. We define a mapped type Prefix<T, P extends string>.
  2. We use the keyof keyword to iterate over all the keys in T.
  3. We use the as keyword followed by a template literal type ${P}_${K} to prefix the key names.
  4. Inside the square brackets, we map each key K to the new prefixed key ${P}_${K} and its corresponding value T[K].

Now, let's test the implementation:

type A = Prefix<{  a: 'bfe',  b: 'dev'}, 'BFE'>;// { BFE_a: 'bfe', BFE_b: 'dev'}// Test caseconst a: A = {  BFE_a: 'bfe',  BFE_b: 'dev'};

The type A is expected to be { BFE_a: 'bfe', BFE_b: 'dev'}.

Hope this helps! Let me know if you have any other questions.