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enum Gender { | |
MALE, | |
FEMALE, | |
UNKNOWN, | |
} | |
type Person = { | |
name: string; | |
age: number; | |
verified: boolean; | |
gender: Gender; | |
children: Person[]; | |
useless: null; | |
someTuple: [string, number]; | |
}; | |
type FormModel = { | |
entries: Person[]; | |
main: Person; | |
} | |
type TypedPathGenerator = { | |
getPath(): string; | |
} | |
type TypedArrayWrapper<E, T extends E[]> = TypedPathGenerator & { | |
[index: number]: TypedPathWrapper<E>; | |
} | |
type Primitives = string | number | boolean | null | undefined; | |
type TypedValueWrapper<T extends Primitives> = TypedPathGenerator; | |
type TypedPathWrapper<T extends Object> = TypedPathGenerator & { | |
[K in keyof T]: T[K] extends (infer E)[] ? TypedArrayWrapper<E, T[K]> : T[K] extends Primitives ? TypedValueWrapper<T[K]> : TypedPathWrapper<T[K]>; | |
}; | |
type FormXYPath = TypedPathWrapper<FormModel>; | |
function foo(x: FormXYPath) { | |
x.entries[0].age.getPath(); | |
x.main.gender.getPath(); | |
x.main.children[1].gender.getPath(); | |
x.main.gender.getPath(); | |
x.main.verified.getPath(); | |
x.main.useless.getPath(); | |
x.main.someTuple.getPath(); | |
x.main.getPath(); | |
} |
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