[Typescript] 86. Medium - ToPrimitive
typescript Medium 86
2023-09-14 09:00:44 时间
Convert a property of type literal (label type) to a primitive type.
For example
type X = {
name: 'Tom',
age: 30,
married: false,
addr: {
home: '123456',
phone: '13111111111'
}
}
type Expected = {
name: string,
age: number,
married: boolean,
addr: {
home: string,
phone: string
}
}
type Todo = ToPrimitive<X> // should be same as `Expected`
/* _____________ Your Code Here _____________ */
type ArrayToPrimitive<T extends any[], ACC extends any[] = []> = T extends [infer F, ...infer RT]
? [ValueToPrimitive<F>, ...ArrayToPrimitive<RT>]
: ACC;
type ObjectToPrimitive<T extends Record<PropertyKey, any>> = {
[Key in keyof T]: T[Key] extends Record<PropertyKey, any>
? ObjectToPrimitive<T[Key]>
: ValueToPrimitive<T[Key]>
}
type ValueToPrimitive<T extends any> = T extends string
? string
: T extends number
? number
: T extends boolean
? boolean
: T extends undefined
? undefined
: T extends null
? null
: never;
type ToPrimitive<T extends Record<PropertyKey, any>> = {
[Key in keyof T]: T[Key] extends any[]
? ArrayToPrimitive<T[Key]>
: T[Key] extends object
? ObjectToPrimitive<T[Key]>
: ValueToPrimitive<T[Key]>
}
/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'
type PersonInfo = {
name: 'Tom'
age: 30
married: false
addr: {
home: '123456'
phone: '13111111111'
},
hobbies: ['swim', 'sing']
}
type ExpectedResult = {
name: string
age: number
married: boolean
addr: {
home: string
phone: string
}
hobbies: [string, string]
}
type cases = [
Expect<Equal<ToPrimitive<PersonInfo>, ExpectedResult>>,
]
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