Consider this scenario where an EmployeeDTO type is defined with properties like firstName, lastName, and dateOfBirth using Date
type EmployeeDTO = {
firstName: string
lastName: string;
dateOfBirth: Date;
}
Now, we need a utility type that can transform all properties of type Date to be of type moment
type EmployeeDTO = {
firstName: string
lastName: string;
dateOfBirth: moment;
}
Can this be adjusted to convert from a string[] to just a string?
In my testing, it seems that neither the extends Array<any> nor the
extends Record<string, any>I'm thinking about how to achieve this in a different way:
type HasStrArr = {
strArr: string[];
}
type ModifyProp<T extends {}, TFrom, TTo> = {
[K in keyof T]: Exclude<T[K], undefined> extends Array<any>
? ModifyProp<T[K], TFrom, TTo>
: Exclude<T[K], undefined> extends Record<string, any>
? ModifyProp<T[K], TFrom, TTo>
: Exclude<T[K], undefined> extends TFrom
? TTo
: T[K];
};
type JustStrings = ModifyProp<HasStrArr,string[],string>
/*
{
strArr: string[];
}
*/
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