trying register interface syntax

.vscode/settings.json

@@ -2,7 +2,7 @@
   "editor.formatOnSave": false,
   "javascript.format.enable": false,
   "editor.codeActionsOnSave": {
-    "source.fixAll.eslint": true
+    "source.fixAll.eslint": "explicit"
   },
   "cSpell.words": [
     "camelcase",

README.md

@@ -71,7 +71,7 @@ This library provides a useful method for automatically loading profiles. If you
 ```
 
 ```ts
-import { createMapper, loadProfiles } from '@stackoverfloweth/mapper'
+import { createMapper, loadProfiles } from '@kitbag/mapper'
 import * as maybeProfiles from '@/maps'
 
 const profiles = loadProfiles(maybeProfiles)

src/createMapper.ts

@@ -1,5 +1,5 @@
 import { ProfileNotFoundError } from '@/profileNotFoundError'
-import { Mapper, Profile, ProfileKey } from '@/types'
+import { GenericMapper, Mapper, Profile, ProfileKey } from '@/types'
 
 export function createMapper<T extends Profile>(profiles: T[]): Mapper<T> {
 
@@ -16,14 +16,16 @@ export function createMapper<T extends Profile>(profiles: T[]): Mapper<T> {
     return profile
   }
 
-  const mapper: Mapper<T> = {
+  const mapper: GenericMapper = {
     map: (sourceKey, source, destinationKey) => {
-      const profile = getProfile(sourceKey, destinationKey)
+      const { map } = getProfile(sourceKey, destinationKey)
+      const profile = { map: map.bind(mapper) }
 
       return profile.map(source)
     },
     mapMany: (sourceKey, sourceArray, destinationKey) => {
-      const profile = getProfile(sourceKey, destinationKey)
+      const { map } = getProfile(sourceKey, destinationKey)
+      const profile = { map: map.bind(mapper) }
 
       return sourceArray.map(source => profile.map(source))
     },

src/createmapper.spec.ts

@@ -6,7 +6,9 @@ import { Profile } from '@/types'
 const stringToBoolean = {
   sourceKey: 'string',
   destinationKey: 'boolean',
-  map: (source: string): boolean => Boolean(source),
+  map: function(source) {
+    this.map('anything', source, 'else')
+  },
 } as const satisfies Profile
 
 const mapper = createMapper([stringToBoolean])

src/types/mapper.ts

@@ -1,4 +1,4 @@
-import { ExtractSourceKeys, ExtractSources, ExtractDestinationKeys, ExtractDestinations, Profile } from '@/types/profile'
+import { ExtractSourceKeys, ExtractSources, ExtractDestinationKeys, ExtractDestinations, Profile, GenericProfile } from '@/types/profile'
 
 export type Mapper<T extends Profile> = {
   map: <
@@ -13,4 +13,19 @@ export type Mapper<T extends Profile> = {
     TDestinationKey extends ExtractDestinationKeys<T, TSourceKey>,
     TDestination extends ExtractDestinations<T, TSourceKey, TDestinationKey>
   > (sourceKey: TSourceKey, sourceArray: TSource[], destinationKey: TDestinationKey) => TDestination[],
-}
+}
+
+export type GenericMapper = {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  map: (sourceKey: string, source: any, destinationKey: string) => any,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  mapMany: (sourceKey: string, sourceArray: any[], destinationKey: string) => any[],
+}
+
+export interface Register {
+  // mapper: Mapper
+}
+
+export type RegisteredMapper = Register extends { mapper: infer TMapper }
+  ? TMapper
+  : GenericMapper

src/types/profile.ts

@@ -1,8 +1,17 @@
+import { GenericMapper, RegisteredMapper } from '@/types/mapper'
+
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 export interface Profile<TSourceKey extends string = string, TSource = any, TDestinationKey extends string = string, TDestination = any> {
   sourceKey: TSourceKey,
   destinationKey: TDestinationKey,
-  map: (source: TSource) => TDestination,
+  map: (this: RegisteredMapper, source: TSource) => TDestination,
+}
+
+export interface GenericProfile {
+  sourceKey: string,
+  destinationKey: string,
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  map: (this: GenericMapper, source: any) => any,
 }
 
 export type ProfileKey<T extends Profile> = `${T['sourceKey']}-${T['destinationKey']}`