Apply production-ready PostHog SDK patterns for TypeScript and Python. Use when implementing PostHog integrations, refactoring SDK usage, or establishing team coding standards for PostHog. Trigger with phrases like "posthog SDK patterns", "posthog best practices", "posthog code patterns", "idiomatic posthog".
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name: posthog-sdk-patterns description: | Apply production-ready PostHog SDK patterns for TypeScript and Python. Use when implementing PostHog integrations, refactoring SDK usage, or establishing team coding standards for PostHog. Trigger with phrases like "posthog SDK patterns", "posthog best practices", "posthog code patterns", "idiomatic posthog". allowed-tools: Read, Write, Edit version: 1.0.0 license: MIT author: Jeremy Longshore jeremy@intentsolutions.io
PostHog SDK Patterns
Overview
Production-ready patterns for PostHog SDK usage in TypeScript and Python.
Prerequisites
- Completed
posthog-install-authsetup - Familiarity with async/await patterns
- Understanding of error handling best practices
Instructions
Step 1: Implement Singleton Pattern (Recommended)
// src/posthog/client.ts
import { PostHogClient } from '@posthog/sdk';
let instance: PostHogClient | null = null;
export function getPostHogClient(): PostHogClient {
if (!instance) {
instance = new PostHogClient({
apiKey: process.env.POSTHOG_API_KEY!,
// Additional options
});
}
return instance;
}
Step 2: Add Error Handling Wrapper
import { PostHogError } from '@posthog/sdk';
async function safePostHogCall<T>(
operation: () => Promise<T>
): Promise<{ data: T | null; error: Error | null }> {
try {
const data = await operation();
return { data, error: null };
} catch (err) {
if (err instanceof PostHogError) {
console.error({
code: err.code,
message: err.message,
});
}
return { data: null, error: err as Error };
}
}
Step 3: Implement Retry Logic
async function withRetry<T>(
operation: () => Promise<T>,
maxRetries = 3,
backoffMs = 1000
): Promise<T> {
for (let attempt = 1; attempt <= maxRetries; attempt++) {
try {
return await operation();
} catch (err) {
if (attempt === maxRetries) throw err;
const delay = backoffMs * Math.pow(2, attempt - 1);
await new Promise(r => setTimeout(r, delay));
}
}
throw new Error('Unreachable');
}
Output
- Type-safe client singleton
- Robust error handling with structured logging
- Automatic retry with exponential backoff
- Runtime validation for API responses
Error Handling
| Pattern | Use Case | Benefit |
|---|---|---|
| Safe wrapper | All API calls | Prevents uncaught exceptions |
| Retry logic | Transient failures | Improves reliability |
| Type guards | Response validation | Catches API changes |
| Logging | All operations | Debugging and monitoring |
Examples
Factory Pattern (Multi-tenant)
const clients = new Map<string, PostHogClient>();
export function getClientForTenant(tenantId: string): PostHogClient {
if (!clients.has(tenantId)) {
const apiKey = getTenantApiKey(tenantId);
clients.set(tenantId, new PostHogClient({ apiKey }));
}
return clients.get(tenantId)!;
}
Python Context Manager
from contextlib import asynccontextmanager
from posthog import PostHogClient
@asynccontextmanager
async def get_posthog_client():
client = PostHogClient()
try:
yield client
finally:
await client.close()
Zod Validation
import { z } from 'zod';
const posthogResponseSchema = z.object({
id: z.string(),
status: z.enum(['active', 'inactive']),
createdAt: z.string().datetime(),
});
Resources
Next Steps
Apply patterns in posthog-core-workflow-a for real-world usage.
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