fix upload dragger

[Pythonfo]

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Merging #1032 into master will not change coverage.
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  Hits         4194     4194           
  Misses        590      590           
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[tangjinzhou]

static Dragger: typeof Dragger ?

[Pythonfo]

文档上没有dragger的api。所以我直接挂到upload上去了。如果dragger的api和upload不一样，那就再写一个d.ts。

[hzgotb]

如果没问题就通过吧。现在eslint疯狂弹提示

[github-actions]

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