Color: make mix() first parameter mandatory, closes #3204

changelogs/4.0-snapshot.md

@@ -769,6 +769,7 @@ This version features substantial changes to the network system, improving coher
   - `Utils::$online`
   - `Utils::$os`
 - The following API methods have signature changes:
+  - `Color::mix()` now requires the first parameter. Previously, it was possible to pass zero arguments, which would raise an `ArgumentCountError` (not static analysis friendly).
   - `Internet::simpleCurl()` now requires a `Closure` for its `onSuccess` parameter instead of `callable`.
 - The following API methods have been removed:
   - `Color->setA()`

src/utils/Color.php

@@ -79,15 +79,14 @@ final class Color{
 	/**
 	 * Mixes the supplied list of colours together to produce a result colour.
 	 *
+	 * @param Color $color1
 	 * @param Color ...$colors
 	 *
 	 * @return Color
 	 */
-	public static function mix(Color ...$colors) : Color{
+	public static function mix(Color $color1, Color ...$colors) : Color{
+		$colors[] = $color1;
 		$count = count($colors);
-		if($count < 1){
-			throw new \ArgumentCountError("No colors given");
-		}
 
 		$a = $r = $g = $b = 0;