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Ibrahim.Sluma's questions

Martin Hope
Ibrahim.Sluma
Asked: 2025-04-21 15:22:07 +0800 CST
  • 6

Estou tentando criar um tipo genérico que altere qualquer tipo de propriedade de um para outro. Funciona se eu criar um novo objeto com o novo tipo convertido, mas gera erros se eu tentar convertê-lo dinamicamente usando o tipo de interface antigo:

Código:

export type ConvertTypes<B, F, T> = { [K in keyof B]: B[K] extends F ? T : B[K] }
export type ConvertStringToDate<T> = ConvertTypes<T, string, Date>

interface ITest {
  aa: number;
  bb: string;
  cc: Date;
}

// Working
const test :ITest = {
  aa: 1,
  bb: 'test',
  cc: new Date()
}

// Working
const test2: ConvertStringToDate<ITest> = {
  aa: 1,
  bb: new Date(),
  cc: new Date()
}

let test3: ConvertStringToDate<ITest>

// Not Working
for (let field of Object.keys(test)) {
  test3[field] = typeof test[field] === 'string' ? new Date() : test[field]
}

Erros:

Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'ConvertTypes<ITest, string, Date>'.
  No index signature with a parameter of type 'string' was found on type 'ConvertTypes<ITest, string, Date>'.
Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'ITest'.
  No index signature with a parameter of type 'string' was found on type 'ITest'.
Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'ITest'.
  No index signature with a parameter of type 'string' was found on type 'ITest'.

O código testado deve funcionar bem e converter valores de testvariáveis ​​para novas variáveis test3.

typescript