Anonymous arrow function warning with Next.js

[k4rli]

Describe the bug

Warning message appears about anonymous arrow function. yup 0.32.5

A codemod is available to fix the most common cases: https://nextjs.link/codemod-ndc
warn  - ./node_modules/yup/es/util/isSchema.js
Anonymous arrow functions cause Fast Refresh to not preserve local component state.
Please add a name to your function, for example:

Before
export default () => <div />;

After
const Named = () => <div />;
export default Named;

A codemod is available to fix the most common cases: https://nextjs.link/codemod-ndc

./node_modules/yup/es/util/isAbsent.js
Anonymous arrow functions cause Fast Refresh to not preserve local component state.
Please add a name to your function, for example:

Before
export default () => <div />;

After
const Named = () => <div />;
export default Named;

A codemod is available to fix the most common cases: https://nextjs.link/codemod-ndc

[jquense]

This looks like a bug in Next, isSchema isn't a react component it shouldn't be checking it

[tomdohnal]

I've come across this warning too and would like to revisit the issue.

1. I don't even if it's possible for libraries like Next.js to know is a function is or is not a React component.
2. I believe that changing

export default (value: any): value is undefined | null => value == null;

to

const isAbsent = (value: any): value is undefined | null => value == null
export default isAbsent;

is not such a big deal. (Happy to send a PR)

Would you be willing to merge a PR with these changes? @jquense