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RecursiveReadonly and RecursivePartial #18591

Closed

NN--- opened this issue Sep 20, 2017 · 1 comment

NN--- commented Sep 20, 2017

Suggestion to add types to lib.d.ts:

type RecursiveReadonly<T> = {
	readonly [P in keyof T]: RecursiveReadonly<T[P]>;
};

type RecursivePartial<T> = {
    [P in keyof T]?: RecursivePartial<T[P]>;
};

Difference from Readonly and Partial

type ComplexType = { a: { b: { c: { d: number; } } } };

const x:Readonly<ComplexType> = {
    a: { b: { c: { d: 1 } } }
};
const xx: RecursiveReadonly<ComplexType> = {
    a: { b: { c: { d: 1 } } }
};
x.a.b.c.d = 3;
//xx.a.b.c.d = 3; // Error

const y:Partial<ComplexType> = {};
const yy: RecursivePartial<ComplexType> = {};

//y.a = {};// Error
yy.a = {}; // OK

Contributor

kitsonk commented Sep 20, 2017

Duplicate of #13923

NN--- closed this as completed

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