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interface FeatureFlag {
enabled: boolean;
description: string;
rollout_percentage: number;
}
interface FeatureFlags {
flags: Record<string, FeatureFlag>;
version: string;
last_updated: string;
}
function App() {
const [count, setCount] = useState<number | null>(null);
const [countLoading, setCountLoading] = useState(true);
const [countError, setCountError] = useState<string | null>(null);
const [flags, setFlags] = useState<FeatureFlags | null>(null);
const [loading, setLoading] = useState(true);
const [error, setError] = useState<string | null>(null);
// Fetch initial count on mount
useEffect(() => {
fetch('/api/count')
.then((res) => {
if (!res.ok) throw new Error(`HTTP ${res.status}`);
return res.json();
})
.then((data) => {
setCount(data.count);
setCountLoading(false);
})
.catch((err) => {
setCountError(err.message);
setCountLoading(false);
});
}, []);
// Fetch feature flags on mount
useEffect(() => {
fetch('/flags/features.json')
.then((res) => {
if (!res.ok) throw new Error(`HTTP ${res.status}`);
return res.json();
})
.then((data) => {
setFlags(data);
setLoading(false);
})
.catch((err) => {
setError(err.message);
setLoading(false);
});
}, []);
// Handle increment via API
const handleIncrement = async () => {
try {
const res = await fetch('/api/count', { method: 'POST' });
if (!res.ok) throw new Error(`HTTP ${res.status}`);
const data = await res.json();
setCount(data.count);
} catch (err) {
setCountError(err instanceof Error ? err.message : 'Update failed');
}
};
return (
<div className="container">
<h1>Demo App</h1>
<p>A simple React + TypeScript + Vite demo.</p>
<div className="card">
<button onClick={handleIncrement} disabled={countLoading}>
{countLoading ? 'Loading...' : `Count is ${count ?? 0}`}
</button>
{countError && (
<p style={{ color: 'red', fontSize: '0.8rem', marginTop: '0.5rem' }}>
Counter error: {countError}
</p>
)}
</div>
<div className="card" style={{ marginTop: '2rem', textAlign: 'left' }}>
<h2>Feature Flags</h2>
<p style={{ fontSize: '0.9rem', opacity: 0.7 }}>
Fetched via proxy rule: <code>/flags/*</code> → <code>demo-feature-flags</code>
</p>
{loading && <p>Loading flags...</p>}
{error && <p style={{ color: 'red' }}>Error: {error}</p>}
{flags && (
<div>
<p style={{ fontSize: '0.8rem', opacity: 0.6 }}>
Version: {flags.version} | Updated: {flags.last_updated}
</p>
<table style={{ width: '100%', borderCollapse: 'collapse' }}>
<thead>
<tr>
<th style={{ textAlign: 'left', padding: '0.5rem' }}>Flag</th>
<th style={{ textAlign: 'center', padding: '0.5rem' }}>Status</th>
<th style={{ textAlign: 'right', padding: '0.5rem' }}>Rollout</th>
</tr>
</thead>
<tbody>
{Object.entries(flags.flags).map(([key, flag]) => (
<tr key={key} style={{ borderTop: '1px solid #333' }}>
<td style={{ padding: '0.5rem' }}>
<strong>{key}</strong>
<br />
<span style={{ fontSize: '0.8rem', opacity: 0.7 }}>{flag.description}</span>
</td>
<td style={{ textAlign: 'center', padding: '0.5rem' }}>
<span
style={{
padding: '0.25rem 0.5rem',
borderRadius: '4px',
fontSize: '0.8rem',
background: flag.enabled ? '#22c55e' : '#ef4444',
color: 'white',
}}
>
{flag.enabled ? 'ON' : 'OFF'}
</span>
</td>
<td style={{ textAlign: 'right', padding: '0.5rem' }}>
{flag.rollout_percentage}%
</td>
</tr>
))}
</tbody>
</table>
</div>
)}
</div>
</div>
);
}
export default App;
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