src 结构调整, 添加 functions

src/functions/scss.ts

@@ -0,0 +1,27 @@
+import { hsl, parseToHsl } from "polished";
+
+/**
+ * 改变颜色的亮度, 等同于 sass 中的 `color.scale` 函数
+ * @param color 颜色值
+ * @param lightnessScale 亮度变化比例，负数表示变暗，正数表示变亮
+ * @returns 新的颜色值
+ * @example
+ * const newColor = scaleColorLight("#ff0000", 20); // 变亮
+ * const newColor = scaleColorLight("#ff0000", -20); // 变暗
+ * 等同于 sass `@use "sass:color"`;
+ * color: color.scale(#ff0000, $lightness: 20%)
+ * color: color.scale(#ff0000, $lightness: -20%)
+ */
+export function scaleColorLight(color: string, lightness: number) {
+  const hslColor = parseToHsl(color);
+  let newLightness;
+
+  if (lightness < 0) {
+    newLightness = hslColor.lightness * (1 + lightness / 100); // 变暗
+  } else {
+    newLightness = hslColor.lightness + (1 - hslColor.lightness) * (lightness / 100); // 变亮
+  }
+
+  newLightness = Math.min(1, Math.max(0, newLightness)); // 确保亮度值在 0 到 1 之间
+  return hsl(hslColor.hue, hslColor.saturation, newLightness);
+}