The concept of TypeScript usage within the `mui-x` DataGrid while calling the `useGridApiRef()` function

Could someone please help me understand the syntax used in this code snippet from mui/mui-x?

export declare const useGridApiRef: <Api extends GridApiCommon = GridApiPro>() => React.MutableRefObject<Api>;

My interpretation is that it exports a declared type with this complex structure, but ultimately it seems to be defining a callable function that returns a mutable reference to something of a certain type. Quite confusing, right? ¯_(ツ)_/¯

I'm not looking for an explanation of what the code actually does, but rather seeking clarity on the declaration syntax being used here. I may be new-ish to TypeScript, but I do have experience in computer science and development, so definitely not a beginner question.

typescriptmaterial-uitypescript-typingsreact-typescript

Answer №1

This code snippet defines a function that has the same functionality as the one written below:

export declare function useGridApiRef<Api extends GridApiCommon = GridApiPro>() {
  return React.MutableRefObject<Api>;
}

It is essentially creating a generic function with a default type of GridApiPro, using an arrow function for the type definition.

If you want to declare an arrow function with generics, simply specify the type-names before the parameters like this:

export declare const functionName: <T>() => {
  ...
};

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