Typescript 到底应该怎么转换 DOM 对象类型？

编译报错 TS2339: Property 'xxxx' does not exist on type 'HTMLElement'

尝试过

let ele: HTMLImageElement = document.getElementById("img") as HTMLImageElement

可是依然报错：

是我的 ts 配置不对吗？

{
  "compilerOptions": {
    "outDir": "./dist/",
    "sourceMap": true,
    "lib": ["es5", "es6", "dom"],
    "alwaysStrict": true,
    "allowSyntheticDefaultImports": true,
    "module": "es6",
    "target": "es5",
    "jsx": "react",
    "allowJs": true
  }
}

Package 完整代码：https://github.com/mashirozx/sakura2