logger.js

/*
 *  Logger class
 *  - debug
 *  - info
 *  - error
 *  - warn
 *  - setLevel
 */

export default class Log {
    constructor(level = 'INFO') {
        this.logLevel = level;
    }

    log(args) {
        args = Array.prototype.slice.call(args);
        args.unshift(`[${this.logLevel}] `);
        let console = window.console;
        if (console && console.log && console.log.apply) {
            try {
                console.log.apply(this, args);
            } catch(e) {};
        }
    }

    distinctLog(level, args) {
        let prevLevel = this.logLevel;
        this.logLevel = level;
        this.log(args);
        this.logLevel = prevLevel;
    }

    debug(args) {
        if (this.logLevel === 'DEBUG') {
            this.log(args);
        }
    }

    info(args) {
        if (this.logLevel === 'INFO') {
            this.log("INFO", arguments);
        }
    }

    error(args) {
        this.distinctLog('ERROR', args);
    }

    warn(args) {
        this.distinctLog('WARN', args);
    }

    setLevel(level) {
        this.logLevel = level;
    }
}