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Resolve map and mapMany profiles through a precomputed index #32

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Merged
stackoverfloweth merged 1 commit into from
Sep 30, 2026
+21 −7
Merged

Resolve map and mapMany profiles through a precomputed index #32

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28 changes: 21 additions & 7 deletions src/types/mapper.ts
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Original file line number Diff line number Diff line change
@@ -1,15 +1,29 @@
import { ExtractSourceKeys, ExtractSources, ExtractDestinationKeys, ExtractDestinations, Profile } from '@/types/profile'
import { ExtractSourceKeys, Profile } from '@/types/profile'

/**
* Registered profiles grouped once by source key, then destination key, so each `map` call is two
* property lookups rather than a fresh pass over every registered profile.
*/
type ProfileIndex<TProfile> = {
[TSourceKey in ExtractSourceKeys<TProfile>]: {
[TMatch in Extract<TProfile, { sourceKey: TSourceKey }> as TMatch extends Profile ? TMatch['destinationKey'] : never]: TMatch
}
}

type ProfileSource<TProfile> = TProfile extends Profile<string, infer TSource, string, unknown> ? TSource : never

type ProfileDestination<TProfile> = TProfile extends Profile<string, never, string, infer TDestination> ? TDestination : never

export type Mapper<TProfiles extends readonly Profile[], TProfile = TProfiles[number]> = {
register: (profiles: Profile[] | readonly Profile[] | Profile) => void,
clear: () => void,
has: (sourceKey: string, destinationKey: string) => boolean,
map: <
TSourceKey extends ExtractSourceKeys<TProfile>,
TDestinationKey extends ExtractDestinationKeys<TProfile, TSourceKey>
> (sourceKey: TSourceKey, source: ExtractSources<TProfile, TSourceKey>, destinationKey: TDestinationKey) => ExtractDestinations<TProfile, TSourceKey, TDestinationKey>,
TSourceKey extends keyof ProfileIndex<TProfile> & string,
TDestinationKey extends keyof ProfileIndex<TProfile>[TSourceKey] & string
> (sourceKey: TSourceKey, source: ProfileSource<ProfileIndex<TProfile>[TSourceKey][TDestinationKey]>, destinationKey: TDestinationKey) => ProfileDestination<ProfileIndex<TProfile>[TSourceKey][TDestinationKey]>,
mapMany: <
TSourceKey extends ExtractSourceKeys<TProfile>,
TDestinationKey extends ExtractDestinationKeys<TProfile, TSourceKey>
> (sourceKey: TSourceKey, sourceArray: ExtractSources<TProfile, TSourceKey>[], destinationKey: TDestinationKey) => ExtractDestinations<TProfile, TSourceKey, TDestinationKey>[],
TSourceKey extends keyof ProfileIndex<TProfile> & string,
TDestinationKey extends keyof ProfileIndex<TProfile>[TSourceKey] & string
> (sourceKey: TSourceKey, sourceArray: ProfileSource<ProfileIndex<TProfile>[TSourceKey][TDestinationKey]>[], destinationKey: TDestinationKey) => ProfileDestination<ProfileIndex<TProfile>[TSourceKey][TDestinationKey]>[],
}