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test: Fetch keys parameter type inference #24

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test: Fetch keys parameter type inference #24

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13 changes: 12 additions & 1 deletion test/index.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,8 @@ import {
PickKeys,
FetchKeys,
postprocessQuery,
Api
Api,
PaginatedPublicArticleList
} from './generated/__generated-api'
import onCreateRoute from '../src/onCreateRoute'

Expand Down Expand Up @@ -387,4 +388,14 @@ describe('API class', () => {
}[]
}>()
})

it('infers array fetchKeys parameter type as const', () => {
const testFn = <T extends FetchKeys<PaginatedPublicArticleList>>(
fetchKeys: T
) => fetchKeys

const returnedFetchKeys = testFn(['author'])
// check if array fetchKeys are inferred as ["key"], not "key"[] when passed into a function
expectTypeOf(returnedFetchKeys).toEqualTypeOf<['author']>()
})
})