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Minimal data fetching LoadState
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| type LoadState<T> = | |
| | { state: "loading" } | |
| | { state: "loaded", data: T } | |
| // Not all usecases will have an error state, in which case it's fine to omit it here. | |
| | { state: "error", err: string }; | |
| type ExamplePayload = string; | |
| const ExampleComponent = () => { | |
| const [ loadState, setLoadState ] = useState<LoadState<ExamplePayload>>({ state: "loading" }); | |
| useEffect(() => { | |
| apiCall() | |
| .then(data => setLoadState({state: "loaded", data })) | |
| .catch(err => setLoadState({state: "error", err: err.message})); | |
| }, []); | |
| if(loadState.state === "loading") { | |
| return <LoadSpinner />; | |
| } | |
| if(loadState.state === "error") { | |
| return <ErrorMessage message={loadState.err} /> | |
| } | |
| const payload = loadState.data; | |
| return <div>Hello {payload}</div>; | |
| } |
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