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I'm sharing this because so many people are making this mistake. I get asked this question two or three times a month.

In @utils/fetcher.ts

(...) => ( axios.get(...) ) instead

(...) => { axios.get(...) }

There are many people who do this. These two are completely different. They produce completely different results.

In conclusion, you should do ( axios.get(...) ).

This is syntactically equivalent to { return axios.get(...) }.

Please add return or wrap it with ( ) instead of { }.

If you don't understand why, quickly study the arrow function syntax again.