@ws-kit/bun/dist/websocket.js

Bun platform adapter for WS-Kit leveraging native WebSocket API with built-in pub/sub and low-latency message routing

// SPDX-FileCopyrightText: 2025-present Kriasoft
// SPDX-License-Identifier: MIT
/**
 * Adapts Bun's ServerWebSocket to conform to the core interface.
 *
 * Bun's ServerWebSocket already implements all required methods and properties,
 * so this adapter is primarily for type safety and documentation.
 *
 * **Note**: This adapter has no runtime overhead—it's purely for TypeScript
 * type checking. At runtime, we pass through to Bun's native WebSocket.
 *
 * This function is for Bun-specific application code. The router itself receives
 * platform-specific WebSockets and handles the adaptation internally.
 *
 * @param ws - Bun's ServerWebSocket instance (can have generic TData)
 * @returns The same WebSocket (no-op at runtime) cast to core's non-generic ServerWebSocket
 */
export function adaptBunWebSocket(ws) {
    // Verify the interface at compile time
    // At runtime, this is a no-op—we just return the WebSocket as-is
    const socket = ws;
    return socket;
}
/**
 * Type guard to check if an object is a Bun ServerWebSocket.
 *
 * Useful for platform detection or conditional logic.
 *
 * @param ws - Unknown WebSocket-like object
 * @returns true if ws has Bun ServerWebSocket methods
 */
export function isBunWebSocket(ws) {
    if (!ws || typeof ws !== "object")
        return false;
    const socket = ws;
    return (typeof socket.send === "function" &&
        typeof socket.close === "function" &&
        typeof socket.subscribe === "function" &&
        typeof socket.unsubscribe === "function" &&
        socket.data !== undefined);
}
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