fix: types

src/cssTransform.ts

@@ -1,27 +1,30 @@
+interface CssTransform {
+  (el: HTMLElement, transformRule: string, transitionRule: string): void,
+  /**
+   * 停止 CSS 变换。
+   *
+   * @param el 要停止变换的元素
+   */
+  stop(el: HTMLElement): void
+}
+
 /**
  * CSS 变换。
  *
  * @param el 要变换的元素
  * @param transformRule 变换规则
  * @param transitionRule 过渡规则
  */
-function cssTransform(el: HTMLElement, transformRule: string, transitionRule: string): void {
+const cssTransform: CssTransform = (el: HTMLElement, transformRule: string, transitionRule: string): void => {
   el.style.webkitTransform = transformRule
   el.style.transform = transformRule
   el.style.webkitTransition = `-webkit-transform ${transitionRule}`
   el.style.transition = `transform ${transitionRule}`
 }
 
-/**
- * 停止 CSS 变换。
- *
- * @param el 要停止变换的元素
- */
-function stop(el: HTMLElement): void {
+cssTransform.stop = (el: HTMLElement): void => {
   el.style.webkitTransition = 'none'
   el.style.transition = 'none'
 }
 
-cssTransform.stop = stop
-
 export default cssTransform