Created
November 17, 2017 15:04
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TypeScript SO question 41705559
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type Opt = { id: string, name: string } | |
interface MultiProps { | |
isMultiple: true; | |
options: Opt[]; | |
id: string[]; | |
onChange: (id: string[]) => void; | |
} | |
interface SingleProps { | |
isMultiple: false; | |
options: Opt[]; | |
id: string; | |
onChange: (id: string) => void; | |
} | |
type SelectProps = MultiProps | SingleProps; | |
function Select(props: SelectProps) { | |
if (props.isMultiple) { | |
// works | |
const { id, onChange } = props; | |
onChange(id); | |
} else { | |
// fail | |
const { id, onChange } = props; | |
onChange(id); // error here | |
} | |
} | |
let m: MultiProps = { | |
isMultiple: true, | |
options: [{ id: 'a', name: 'A' }], | |
id: ['a'], | |
onChange: null | |
}; | |
let s: SingleProps = { | |
isMultiple: false, | |
options: [{ id: 'a', name: 'A' }], | |
id: 'a', | |
onChange: null | |
}; | |
Select(m); | |
Select(s); |
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Thanks! 🎉