Despite my efforts, I am still struggling to grasp the concept of the Replace type.
I have thoroughly reviewed the typescript documentation and gained some insight into what is happening in that line, but it remains elusive to me.
Despite my efforts, I am still struggling to grasp the concept of the Replace type.
I have thoroughly reviewed the typescript documentation and gained some insight into what is happening in that line, but it remains elusive to me.
The Replace type is designed to swap properties from one type (T) with those from another type (R).
Breaking it down:
Omit<T, keyof R> eliminates properties in T that have the same name as properties in R.& R combines the resulting type from step 1 with type R, essentially adding the properties of R back into the mix.It may seem counterintuitive to re-add removed properties, but this appears to be a deliberate move to effectively substitute the property types. An illustrative example follows.
type Replace<T, R> = Omit<T, keyof R> & R;
type A = {
prop1: string,
prop2: string,
prop3: string,
prop4: string
};
type B = {
prop3: number,
prop4: number
};
type X = Replace<A, B>;
const x: X = {
prop1: '1',
prop2: '2',
prop3: 3,
prop4: 4
}
By eliminating the shared key of T and R from T, then finding the intersection with R
https://i.sstatic.net/VGniU.png
Upon observation, the common key is b. The value of b in A is string, but after intersecting with C, it becomes boolean
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