Task Description:
I have a set of different areas that need to undergo processing based on their type using the function areaProcessor. Specifically, only areas classified as 'toCreate' or 'toRemove' should be processed.
type AreaType = 'toCreate' | 'toRemove' | 'toUpdate';
const areas: AreaType = { toCreate: [], toUpdate: [], toRemove: [] };
const areaProcessor = (areaType: AreaType, data: any): any => {};
Object.entries(areas)
.filter(([areaType, _]) => areaType === 'toCreate' || areaType === 'toRemove')
.flatMap(([areaType, data]) => areaProcessor(areaType, data));
Issue:
The problem arises when TypeScript throws a type error for areaProcessor:
Argument of type 'string' is not assignable to parameter of type '"toCreate" | "toRemove"'.
This issue occurs because in the flatMap function, areaType is treated as a string instead of being of type
type AreaType = 'toCreate' | 'toRemove' | 'toUpdate';
Solution:
How can I properly convert the types in this scenario?
Note:
I used any temporarily to avoid introducing unnecessary new types.