refactor: move ImageData interface to types.ts and clean up getImageData function

Author: Simon-He95

src/canvas/getImageData.ts

@@ -1,10 +1,6 @@
+import type { ImageData } from '../types'
 import { Canvas } from './Canvas'
 
-interface ImageData {
-  width: number
-  height: number
-  data: Uint8ClampedArray
-}
 export function getImageData(src: string): Promise<ImageData> {
   return new Promise((resolve, reject) => {
     try {

src/types.ts

@@ -254,3 +254,9 @@ export type TimeUnit = 'days' | 'hours' | 'minutes' | 'seconds'
 export type DateString =
   | `${number}-${number}-${number}`
   | `${number}/${number}/${number}`
+
+export interface ImageData {
+  width: number
+  height: number
+  data: Uint8ClampedArray
+}