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OnDragListener接口里 DragEvent是什么？里边的常量值能说一下么

### Describe the bug  ### Reproducer https://primevue.org/tieredmenu/ ### PrimeVue version latest ### Vue version 4.x ### Language TypeScript ### Build / Runtime Vite ### Browser(s) any ### Steps to...

```javascript // 忽略关键字大小写的关键函数，支持语法定义中直接使用关键字字面量 function makeCaseInsensitive(lexer, tokenType) { // 将tokenType 转换成map, const map = new Map(); for (const [type, keywords] of Object.entries(tokenType)) { Array.from(keywords).forEach(k => map.set(k.toLowerCase(), type)); } lexer.next = (next...