@posthog/agent/dist/src/utils/tapped-stream.js

TypeScript agent framework wrapping Claude Agent SDK with Git-based task execution for PostHog

/**
 * Creates a WritableStream wrapper that taps all newline-delimited messages,
 * forwarding each complete line for persistence.
 *
 * This aligns with ACP's transport model - all messages flow through
 * newline-delimited JSON-RPC streams, so we intercept at the transport layer
 * and persist everything.
 */
function createTappedWritableStream(underlying, options) {
    const { onMessage, logger } = options;
    const decoder = new TextDecoder();
    let buffer = "";
    return new WritableStream({
        async write(chunk) {
            // Decode and buffer
            buffer += decoder.decode(chunk, { stream: true });
            // Process complete lines (newline-delimited)
            const lines = buffer.split("\n");
            buffer = lines.pop() ?? "";
            for (const line of lines) {
                if (!line.trim())
                    continue;
                onMessage(line);
            }
            // Forward to underlying stream
            const writer = underlying.getWriter();
            await writer.write(chunk);
            writer.releaseLock();
        },
        async close() {
            const writer = underlying.getWriter();
            await writer.close();
            writer.releaseLock();
        },
        async abort(reason) {
            logger?.warn("Tapped stream aborted", { reason });
            const writer = underlying.getWriter();
            await writer.abort(reason);
            writer.releaseLock();
        },
    });
}

export { createTappedWritableStream };
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