Question

我对数组输入的泛型类型有疑问。我有一个名为useForm的函数，它接受以下选项

export interface DataType {
  [key: string]: FieldValue;
}

export type FieldValue = boolean | string | string[] | number | {};

export default function useForm<Data extends DataType>(
  { mode, validationSchema, defaultValues, validationFields }: Props<Data> = {
    mode: 'onSubmit',
    defaultValues: {},
  },
): UseFormFunctions<Data> {
}

export interface Props<Data> {
  mode: 'onSubmit' | 'onBlur' | 'onChange';
  defaultValues?: { [key: string]: any };
  validationFields?: string[]; // how do i use generic type here to only allow key from FormData
  validationSchema?: any;
}

type FormData = {
  firstName: string,
  lastName: string,
}

const { register } = useForm<FormData>({
  validationFields: ['test'] // should throw error because it's not firstname or lastname
})

我希望它在找不到FormData类型时抛出类型错误。

Answer 1

您可以使用keyof来获取Data中的键的并集：

export default function useForm<Data extends DataType>(
  { mode, validationSchema, defaultValues, validationFields }: Props<Data> = {
    mode: 'onSubmit',
    defaultValues: {},
  },
): UseFormFunctions<Data> {
  return null!;
}

export interface Props<Data> {
  mode: 'onSubmit' | 'onBlur' | 'onChange';
  defaultValues?: { [key: string]: any };
  validationFields?: Array<keyof Data>; // how do i use generic type here to only allow key from FormData
  validationSchema?: any;
}

type FormData = {
  firstName: string,
  lastName: string,
}

const { register } = useForm<FormData>({
  mode: 'onBlur',
  validationFields: ['test'] // error now
})

数组输入的Typescript通用类型

1 个答案: