bun-ws-router/dist/client/backoff.js

Lightweight client/server WebSocket router for Bun with type-safe Zod/Valibot validation.

// SPDX-FileCopyrightText: 2025-present Kriasoft
// SPDX-License-Identifier: MIT
/**
 * Exponential backoff calculation with optional jitter.
 * See @specs/client.md for backoff formula.
 */
export function calculateBackoff(attempt, config) {
    // delay = min(maxDelayMs, initialDelayMs × 2^(attempt-1))
    const exponentialDelay = config.initialDelayMs * Math.pow(2, attempt - 1);
    const cappedDelay = Math.min(config.maxDelayMs, exponentialDelay);
    if (config.jitter === "none") {
        return cappedDelay;
    }
    // Full jitter: random(0, delay)
    return Math.floor(Math.random() * (cappedDelay + 1));
}
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