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It seems you didn’t import the method properly.
Change the import into:
import { getChampionName } from '@/api/search';
You can read more about import export in javascript here:
https://javascript.info/import-export
If you think you almost have the same question as this question, you can also refer to this:
Method "showDate" has type "undefined" in the component definition
Source:stackexchange.com