refactor: Major simplification in providing implementation types (#2)

This PR is an effort to address #1. It removes all boilerplate
  from individual implementation files, and moves it into
  a small, fixed section in the single `all.ts` module for each
  type that collects up all of the implementations relating
  to that type.

Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Reviewed-on: #2

src/Complex/all.ts

@@ -1 +1,8 @@
-export * as Complex from './native.js'
+import {ForType} from '../core/Dispatcher.js'
+import * as Complex from './native.js'
+
+export {Complex}
+
+declare module "../core/Dispatcher" {
+   interface ImplementationTypes extends ForType<'Complex', typeof Complex> {}
+}

src/Complex/type.ts

@@ -1,4 +1,3 @@
-/// <reference path="../numbers/type.ts">
 import {joinTypes, typeOfDependency, Dependency} from '../core/Dispatcher.js'
 
 export type Complex<T> = {re: T; im: T;}
@@ -18,13 +17,6 @@ export const Complex_type = {
    }
 }
 
-export const complex_1 = <T>(dep: Dependency<'zero', [T]>) =>
+export const complex_unary = <T>(dep: Dependency<'zero', [T]>) =>
    (t: T) => ({re: t, im: dep.zero(t)})
-export const complex_2 = <T>(t: T, u: T) => ({re: t, im: u})
+export const complex_binary = <T>(t: T, u: T) => ({re: t, im: u})
-
-declare module "../core/Dispatcher" {
-   interface ImplementationTypes {
-      complex_1_Complex: typeof complex_1
-      complex_2_Complex: typeof complex_2
-   }
-}

src/core/Dispatcher.ts

@@ -14,6 +14,12 @@ type Signature = Parameter[]
 export interface ImplementationTypes {}
 export type typeOfDependency = {typeOf: (x: unknown) => TypeName}
 
+// Helper for collecting implementations
+// (Really just suffixes the type name onto the keys of exports)
+export type ForType<T extends string, Exports> = keyof Exports extends string
+   ? {[K in keyof Exports as `${K}_${T}`]: Exports[K]}
+   : never
+
 //dummy implementation for now
 export function joinTypes(a: TypeName, b: TypeName) {
    if (a === b) return a

src/numbers/all.ts

@@ -1 +1,8 @@
-export * as numbers from './native.js'
+import {ForType} from '../core/Dispatcher.js'
+import * as numbers from './native.js'
+
+export {numbers}
+
+declare module "../core/Dispatcher" {
+   interface ImplementationTypes extends ForType<'numbers', typeof numbers> {}
+}

src/numbers/arithmetic.ts

@@ -1,6 +1,5 @@
-/// <reference path="../Complex/type.ts">
 import {configDependency} from '../core/Config.js'
-import {Dependency, ImplementationTypes} from '../core/Dispatcher.js'
+import {Dependency} from '../core/Dispatcher.js'
 
 export const add = (a: number, b: number) => a + b
 export const unaryMinus = (a: number) => -a

src/numbers/type.ts

@@ -5,9 +5,3 @@ export const number_type = {
 }
 
 export const zero = (a: number) => 0
-
-declare module "../core/Dispatcher" {
-   interface ImplementationTypes {
-      zero_numbers: typeof zero
-   }
-}