rename-types.ts

declare function rename<
  P extends string,
  P2 extends string,
  O extends object,
  Key extends keyof O
>(
  prefix: P,
  newPrefix: P2,
  obj: O
): {
  [K in Key extends `${P}${infer A}` ? `${P2}${A}` : Key]: O[K extends Key
    ? K
    : K extends `${P2}${infer A}`
    ? `${P}${A}`
    : never];
};

const obj = { str1: 1, str2: 2, a3: "1" };
const result = rename("str", "string", obj);






result