[Bug] Type error when customize icon with function

[Vl3oss]

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What is the current behavior?

When customize icon with function like the last example in the doc, Typescript will complain about type mismatched.

For example toast("Wow so easy !", { icon: () => "a" }) would results in this error from

Type '() => string' is not assignable to type 'ReactNode'.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your CodeSandbox (https://codesandbox.io/s/new) example below:

https://codesandbox.io/s/react-toastify-customize-icon-spjxlf?file=/src/App.tsx

What is the expected behavior?

No type error when customize icon with function (the functionality seems to be working as expected)

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?

React version 17-18