Lukas
5166789b68
Introduce discriminated FetchError union type to replace weak string error handling in API calls and hooks. Enables actionable error diagnostics. Changes: - Create types/api.ts with FetchError discriminated union (api_error, network_error, abort_error) - Export type guards: isAuthError, isAbortError, isNetworkError, isApiError - Update useListData and usePolledData to expose typed FetchError instead of string - Add getErrorMessage() helper to extract displayable messages from FetchError - Add createStringErrorAdapter() for backward compatibility with string error state - Update handleFetchError() to work with both FetchError and string setters - Update all consumer hooks to expose typed errors - Update components to use getErrorMessage() when displaying errors - Update tests to mock FetchError instead of strings - Add comprehensive typed error model documentation to Web-Development.md This enables better error handling patterns: - Check error.type to distinguish between API, network, and abort errors - Extract status codes for specific handling (401/403 auth, 50x server errors) - Maintain backward compatibility with existing string-based error states All TypeScript compilation passes with no errors. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
51 lines
1.3 KiB
TypeScript
51 lines
1.3 KiB
TypeScript
import { useCallback, useEffect, useState } from "react";
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import { fetchTimezone } from "../api/setup";
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import { handleFetchError, createStringErrorAdapter } from "../utils/fetchError";
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export interface UseTimezoneDataResult {
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timezone: string;
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loading: boolean;
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error: string | null;
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refresh: () => Promise<void>;
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}
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export function useTimezoneData(): UseTimezoneDataResult {
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const [timezone, setTimezone] = useState<string>("UTC");
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const [loading, setLoading] = useState<boolean>(true);
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const [error, setError] = useState<string | null>(null);
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const load = useCallback(async (signal?: AbortSignal): Promise<void> => {
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setLoading(true);
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setError(null);
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try {
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const resp = await fetchTimezone(signal);
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if (signal?.aborted) return;
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setTimezone(resp.timezone);
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} catch (err: unknown) {
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if (signal?.aborted) return;
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handleFetchError(err, createStringErrorAdapter(setError), "Failed to fetch timezone");
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setTimezone("UTC");
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} finally {
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if (!signal?.aborted) {
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setLoading(false);
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}
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}
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}, []);
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useEffect(() => {
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const controller = new AbortController();
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void load(controller.signal);
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return (): void => {
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controller.abort();
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};
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}, [load]);
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return {
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timezone,
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loading,
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error,
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refresh: load,
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};
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}
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