Is there a way in TypeScript to use the lower case of an enum as an index key type? I have an enum defined as:
export enum NameSet {
Taxi = 'Taxi',
Bus = 'Bus',
Empty = '',
}
I want to define an object with keys based on the lower case values of NameSet like this:
type ITraffic = {
[K in NameSet.toLowerCase()]?: string
}
But it seems that this is not correct. Is there a way to achieve this?
A helpful way to transform NameSet data into an object with lowercase keys is by using the following mapping technique:
interface ProcessedData {
[Key in NameSet as Lowercase<Key>]?: string;
}
To handle empty cases where there should be no key-value pair, you can implement the following adjustment:
interface ProcessedData {
[Key in NameSet as Key extends '' ? never : Lowercase<Key>]?: string;
}
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