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Both backends serve GET /api/v1/language. Frontend calls it once and caches. By this way, front end can know the backend is go or python and thus can determine which part of logic to load. --------- Co-authored-by: Claude <noreply@anthropic.com>
41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
/**
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* Backend runtime language detection.
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*
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* Fetches /api/v1/language once at module load (app start) and caches the
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* result. Components subscribe via React's useSyncExternalStore; there is no
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* per-component fetch or useEffect.
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*
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* Pattern: module-level fetch + listener set, same subscription approach as
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* enterprise billingStatus.ts.
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*/
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type Listener = () => void;
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const listeners = new Set<Listener>();
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let backendLanguage: string | null = null;
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// Kick off the fetch at module load — app start, not component mount.
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const promise: Promise<string> = fetch('/api/v1/language')
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.then((r) => r.json())
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.then((body: { data?: { language?: string } }) => {
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backendLanguage = body.data?.language === 'go' ? 'go' : 'python';
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listeners.forEach((fn) => fn());
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return backendLanguage;
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})
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.catch(() => {
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backendLanguage = 'python';
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listeners.forEach((fn) => fn());
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return 'python';
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});
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export const fetchBackendLanguage = (): Promise<string> => promise;
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export const getBackendLanguage = (): string | null => backendLanguage;
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export const subscribeBackendLanguage = (listener: Listener): (() => void) => {
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listeners.add(listener);
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return () => {
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listeners.delete(listener);
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};
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};
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