What causes the array type to change in this unremarkable map?
Although I'm working on a more complex map, my ultimate goal is to maintain consistency with the array's type throughout the process.
const x: type1[] | type2[]=[]; // x is of type type1[] | type2[]
const y = x.map(item=>item); // y becomes type (type1 | type2)[]
I am specifically using TypeScript version 4.3.5 for this project.
Behold the unique and special List<T>#transform:
transform<U>(operation: (value: T, index: number, collection: T[]) => U, binding?: any): U[];
T is cleverly deduced to be category1 | category2, while U elegantly mirrors T. Ultimately, the function yields U[] which equates to (category1 | category2)[].
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