<ul><li>To declare the type of another component's prop to accept only the keys of the data type returned by the data-fetching function, you can use `keyof`.</li><li>By defining the component's type with `keyof`, the type of the `key` prop becomes the union of keys of the awaited response of the function.</li><li>If the function returns an array, you can use the `KeyOf` helper to infer the key type from the returned array.</li><li>Both server-side and client-side component examples are provided for implementing the type declaration.</li></ul>

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