Convert an additional array iteration into index iteration.

src/clipboard-polyfill/ClipboardItem/check.ts

@@ -4,7 +4,7 @@ export function hasItemWithType(
  clipboardItems: ClipboardItemInterface[],
  typeName: string,
 ): boolean {
- for (var i in clipboardItems) {
+ for (let i = 0; i < clipboardItems.length; i++) {
  var item = clipboardItems[i];
  if (item.types.indexOf(typeName) !== -1) {
  return true;