Bug: incorrect TS function types

The types of the functions in index.d.ts are wrong
None of them provide any types, and look like (...args: unknown[]): unknown;
This is unhelpful since the types of arguments and return types aren't defined, so doesn't help enforce strict typing or tell library users which types to provide in arguments to functions or expect to return from them
For example, onChange is defined as: onChange?(...args: unknown[]): unknown;
onChange should be defined as: onChange?: (newValue: string | number | undefined) => void;

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