Audit function parameter and return types (3/2)

src/distance.js

@@ -1,14 +1,12 @@
 import ColorSpace from "./space.js";
-import getColor from "./getColor.js";
 
 /**
  * Euclidean distance of colors in an arbitrary color space
  */
 export default function distance (color1, color2, space = "lab") {
-	[color1, color2] = getColor([color1, color2]);
-
 	space = ColorSpace.get(space);
 
+	// Assume getColor() is called on color in space.from()
 	let coords1 = space.from(color1);
 	let coords2 = space.from(color2);
 

src/set.js

@@ -29,3 +29,5 @@ export default function set (color, prop, value) {
 
 	return color;
 }
+
+set.returns = "color";

src/setAll.js

@@ -8,3 +8,5 @@ export default function setAll (color, space, coords) {
 	color.coords = space.to(color.space, coords);
 	return color;
 }
+
+setAll.returns = "color";

src/space.js

@@ -1,6 +1,7 @@
 import {type, parseCoordGrammar, serializeNumber, mapRange} from "./util.js";
 import {getWhite} from "./adapt.js";
 import hooks from "./hooks.js";
+import getColor from "./getColor.js";
 
 const ε = .000075;
 
@@ -173,7 +174,8 @@ export default class ColorSpace {
 
 	to (space, coords) {
 		if (arguments.length === 1) {
-			[space, coords] = [space.space, space.coords];
+			const color = getColor(space);
+			[space, coords] = [color.space, color.coords];
 		}
 
 		space = ColorSpace.get(space);
@@ -222,7 +224,8 @@ export default class ColorSpace {
 
 	from (space, coords) {
 		if (arguments.length === 1) {
-			[space, coords] = [space.space, space.coords];
+			const color = getColor(space);
+			[space, coords] = [color.space, color.coords];
 		}
 
 		space = ColorSpace.get(space);

types/src/color.d.ts

@@ -6,17 +6,16 @@ import ColorSpace, { Ref } from "./space.js";
 import SpaceAccessors from "./space-coord-accessors.js";
 
 import {
-	to,
+	to as toFn,
 	parse,
 	serialize,
-	inGamut,
-	toGamut,
-	distance,
-	equals,
+	inGamut as inGamutFn,
+	toGamut as toGamutFn,
+	distance as distanceFn,
+	equals as equalsFn,
 	get,
-	getAll,
-	set,
-	setAll,
+	getAll as getAllFn,
+	setAll as setAllFn,
 	display,
 } from "./index-fn.js";
 
@@ -69,20 +68,34 @@ export type ToColorPrototype<T extends (...args: any[]) => any> = T extends (
 		: (...args: A) => R
 	: never;
 
+/** Convert a function to a Color namespace property (returning a Color) */
+export type ToColorNamespace<T extends (...args: any[]) => any> = T extends (
+	...args: infer A
+) => infer R
+	? T extends { returns: "color" }
+		? (...args: A) => Color
+		: (...args: A) => R
+	: never;
+
 declare namespace Color {
-	export {
-		getAll,
-		set,
-		setAll,
-		to,
-		equals,
-		inGamut,
-		toGamut,
-		distance,
-		serialize as toString,
-	};
+	// Functions defined using Color.defineFunctions
+	export const getAll: ToColorNamespace<typeof getAllFn>;
+	export const setAll: ToColorNamespace<typeof setAllFn>;
+	export const to: ToColorNamespace<typeof toFn>;
+	export const equals: ToColorNamespace<typeof equalsFn>;
+	export const inGamut: ToColorNamespace<typeof inGamutFn>;
+	export const toGamut: ToColorNamespace<typeof toGamutFn>;
+	export const distance: ToColorNamespace<typeof distanceFn>;
+	// `get` is defined below as a static method on the Class,
+	// and `toString` is intentionally not overridden for the namespace
+
 	export { util, hooks, WHITES, ColorSpace as Space, parse, defaults };
 	export const spaces: typeof ColorSpace["registry"];
+
+	// Must be manually defined due to overloads
+	// These should always match the signature of the original function
+	export function set (color: ColorTypes, prop: Ref, value: number | ((coord: number) => number)): Color;
+	export function set (color: ColorTypes, props: Record<string, number | ((coord: number) => number)>): Color;
 }
 
 declare class Color extends SpaceAccessors implements PlainColorObject {
@@ -129,13 +142,13 @@ declare class Color extends SpaceAccessors implements PlainColorObject {
 
 	// Functions defined using Color.defineFunctions
 	get: ToColorPrototype<typeof get>;
-	getAll: ToColorPrototype<typeof getAll>;
-	setAll: ToColorPrototype<typeof setAll>;
-	to: ToColorPrototype<typeof to>;
-	equals: ToColorPrototype<typeof equals>;
-	inGamut: ToColorPrototype<typeof inGamut>;
-	toGamut: ToColorPrototype<typeof toGamut>;
-	distance: ToColorPrototype<typeof distance>;
+	getAll: ToColorPrototype<typeof getAllFn>;
+	setAll: ToColorPrototype<typeof setAllFn>;
+	to: ToColorPrototype<typeof toFn>;
+	equals: ToColorPrototype<typeof equalsFn>;
+	inGamut: ToColorPrototype<typeof inGamutFn>;
+	toGamut: ToColorPrototype<typeof toGamutFn>;
+	distance: ToColorPrototype<typeof distanceFn>;
 	toString: ToColorPrototype<typeof serialize>;
 
 	// Must be manually defined due to overloads

types/src/set.d.ts

@@ -1,12 +1,18 @@
 import { ColorTypes, PlainColorObject } from "./color.js";
 import { Ref } from "./space.js";
 
-export default function set (
+declare namespace set {
+	let returns: "color";
+}
+
+declare function set (
 	color: ColorTypes,
 	prop: Ref,
 	value: number | ((coord: number) => number)
 ): PlainColorObject;
-export default function set (
+declare function set (
 	color: ColorTypes,
 	props: Record<string, number | ((coord: number) => number)>
 ): PlainColorObject;
+
+export default set;

types/src/setAll.d.ts

@@ -1,4 +1,4 @@
-import Color, { ColorTypes, PlainColorObject } from "./color.js";
+import { ColorTypes, PlainColorObject } from "./color.js";
 import ColorSpace from "./space.js";
 
 declare namespace setAll {

types/src/space.d.ts

@@ -1,5 +1,5 @@
 import { White } from "./adapt.js";
-import Color, { ColorConstructor, ColorObject, Coords, PlainColorObject } from "./color.js";
+import { ColorConstructor, Coords, ColorTypes } from "./color.js";
 
 export interface Format {
 	/** @default "function" */
@@ -127,7 +127,7 @@ export default class ColorSpace {
 	white: White;
 	gamutSpace: ColorSpace;
 
-	from (color: {space: ColorSpace, coords: Coords, alpha?: number | undefined}): Coords;
+	from (color: ColorTypes): Coords;
 	from (space: string | ColorSpace, coords: Coords): Coords;
 
 	getFormat (format?: string | Format): Format | null;
@@ -136,7 +136,7 @@ export default class ColorSpace {
 
 	inGamut (coords: Coords, options?: { epsilon?: number }): boolean;
 
-	to (color: {space: ColorSpace, coords: Coords, alpha?: number | undefined}): Coords;
+	to (color: ColorTypes): Coords;
 	to (space: string | ColorSpace, coords: Coords): Coords;
 
 	toString (): string;

types/test/set.ts

@@ -18,3 +18,5 @@ set("red", {
 });
 
 new Color("red").set("foo", 123); // $ExpectType Color
+Color.set("red", "foo", 123); // $ExpectType Color
+Color.set(new Color("red"), "foo", 123); // $ExpectType Color

types/test/setAll.ts

@@ -26,3 +26,5 @@ setAll(
 
 new Color("red").setAll("srgb", [1, 2, 3]); // $ExpectType Color
 new Color("red").setAll(sRGB, [1, 2, 3]); // $ExpectType Color
+Color.setAll("red", "srgb", [1, 2, 3]); // $ExpectType Color
+Color.setAll(new Color("red"), "srgb", [1, 2, 3]); // $ExpectType Color

types/test/spaces.ts

@@ -50,14 +50,15 @@ ColorSpace.resolveCoord("p3.0", "p3");
 ColorSpace.resolveCoord(["p3", "r"], "p3");
 
 space.to(new Color("red")); // $ExpectType Coords
+space.to("red"); // $ExpectType Coords
 space.to({space: space, coords: [1, 2, 3], alpha: 1}); // $ExpectType Coords
 space.to({space: space, coords: [1, 2, 3]}); // $ExpectType Coords
 space.to(space, [1, 2, 3]); // $ExpectType Coords
 space.to("srgb", [1, 2, 3]); // $ExpectType Coords
 
 space.from(new Color("red")); // $ExpectType Coords
+space.from("red"); // $ExpectType Coords
 space.from({space: space, coords: [1, 2, 3], alpha: 1}); // $ExpectType Coords
 space.from({space: space, coords: [1, 2, 3]}); // $ExpectType Coords
 space.from(space, [1, 2, 3]); // $ExpectType Coords
 space.from("srgb", [1, 2, 3]); // $ExpectType Coords
-

types/test/to.ts

@@ -1,3 +1,4 @@
+import Color from "colorjs.io/src";
 import to from "colorjs.io/src/to";
 
 // @ts-expect-error
@@ -8,3 +9,7 @@ to("red");
 
 to("red", "srgb"); // $ExpectType PlainColorObject
 to("red", "srgb", { inGamut: false }); // $ExpectType PlainColorObject
+
+new Color("red").to("srgb"); // $ExpectType Color
+Color.to("red", "srgb"); // $ExpectType Color
+Color.to(new Color("red"), "srgb"); // $ExpectType Color

types/test/toGamut.ts

@@ -17,3 +17,5 @@ new Color("red").toGamut(); // $ExpectType Color
 new Color("red").toGamut({ method: "clip", space: "srgb" }); // $ExpectType Color
 new Color("red").toGamut({ method: "clip", space: sRGB }); // $ExpectType Color
 new Color("red").toGamut("srgb"); // $ExpectType Color
+Color.toGamut("red"); // $ExpectType Color
+Color.toGamut(new Color("red")); // $ExpectType Color