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Update typescript.md (#2764)

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Typo: "That is to say how could **do** we type ..."
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@ -226,7 +226,7 @@ const useBearStore = create(foo(() => ({ bears: 0 }), 'hello'))
console.log(useBearStore.foo.toUpperCase())
```
Zustand middlewares can mutate the store. But how could we possibly encode the mutation on the type-level? That is to say how could do we type `foo` so that this code compiles?
Zustand middlewares can mutate the store. But how could we possibly encode the mutation on the type-level? That is to say how could we type `foo` so that this code compiles?
For a usual statically typed language, this is impossible. But thanks to TypeScript, Zustand has something called a "higher-kinded mutator" that makes this possible. If you are dealing with complex type problems, like typing a middleware or using the `StateCreator` type, you will have to understand this implementation detail. For this, you can [check out #710](https://github.com/pmndrs/zustand/issues/710).