Write a log file with rotation option in Node JS

logrotator.js

const streamFileArchive = require("stream-file-archive")
const Stream = require("stream")

/**
 * Write a log file with rotation option
 *
 * @param {String} path Log file path
 * @param {String} symlink Log file path symlink (latest log file)
 * @param {String} separator String seprator for log data (E.g. separator for array of strings passed into `write` method)
 */
function Logrotator (path, symlink, separator = "|") {
    separator = " " + separator.trim() + " "

    const rotator = streamFileArchive({
        // Write logs rotated by the day
        path: path,
        // Maintain a symlink file of current log
        symlink: symlink,
        // Gzip old log files
        compress: true
    })

    const rs = new Stream()
    rs.pipe(rotator)

    /**
     * Write a string or an array of strings to current log file
     *
     * @param {String|Array} data String or an array of strings
     */
    function write(data) {
        let str = ""

        if (typeof data === "string") {
            str = data
        } else if (Array.isArray(data)) {
            str = data.join(separator)
        } else {
            str = (data || "").toString()
        }

        const datetime = (new Date()).toISOString().replace("T", " ")

        str = datetime + separator + str.trim() + "\n"

        rs.emit("data", str)
    }

    return {
        write
    }
}

module.exports = {
    Logrotator
}