Multiple transports not working in v10.1.0

[channaveer]

Hi I am using Express Js v 5.x and Pino v 10.1.0 with TypeScript v5.9.3 but seems not to work.

Log.ts

import pino from "pino";
import path from "node:path";
const __dirname = import.meta.dirname;

const logFilePath = path.join(__dirname, "..", "..", "logs", "app.log");

class Log {
	private logger: pino.Logger;

	constructor() {
		const options: pino.LoggerOptions = {
			level: process.env.LOG_LEVEL || "info",
			/** Rename "msg" to "message" */
			messageKey: "message",
			/** Rename "err" key to "error" */
			errorKey: "error",
			serializers: {
				error: pino.stdSerializers.err,
			},
			redact: [],
			/** Instead of level to 10, 20, 30, 40 make it show level name like "INFO", "WARN", "ERROR", "FATAL" and rename it to "severity" */
			formatters: {
				level: (level) => {
					return { level: level };
				},
			},
			/** Rename "time" to "timestamp" with UTC timezone format */
			timestamp: () => {
				return `,"timestamp":"${new Date(Date.now()).toISOString()}"`;
			},
		};

		const transports = pino.transport({
			targets: [
				{
					target: "pino/file",
					options: {
						destination: logFilePath,
						mkdir: true,
					},
				},
				{
					target: "pino/file",
					options: {
						destination: 1,
					},
				},
			],
		});

		this.logger = pino(options, transports);
	}

	info(message: string, metadata?: object) {
		this.logger.info({ metadata }, message);
	}

	warn(message: string, metadata?: object) {
		this.logger.warn({ metadata }, message);
	}

	error(error: Error, message?: string, metadata?: object) {
		this.logger.error({ error, metadata }, message);
	}

	fatal(message: string, metadata?: object) {
		this.logger.fatal({ metadata }, message);
	}
}

export default new Log();

NOTE: When I use only 1 transport configuration ie, to STDOUT or to File path it's working. But fails to write logs to either of them when both are enabled.

Please help me if I am doing something wrong. I am new to TypeScript as well as Pino