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获取两个接口类型中的差值属性。

```ts
type Foo = {
  a: string;
  b: number;
}
type Bar = {
  a: string;
  c: boolean
}

type Result1 = Diff<Foo,Bar> // { b: number, c: boolean }
type Result2 = Diff<Bar,Foo> // { b: number, c: boolean }

```

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