Class RateLimiter

Token-bucket rate limiter with exponential backoff for API calls.

Enforces configurable requestsPerMinute and tokensPerMinute limits. When a limit is hit, Acquire() blocks until capacity is available. On 429/rate-limit errors, use ReportRateLimitError() to trigger exponential backoff (1s → 2s → 4s → ... → 60s).

Usage:

const limiter = new RateLimiter({ RequestsPerMinute: 60, TokensPerMinute: 100000 });

// Before each API call:
await limiter.Acquire(estimatedTokens);

// If API returns 429:
limiter.ReportRateLimitError();
await limiter.Acquire(estimatedTokens); // will back off
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