Vuejs-logger NPM

vuejs-logger

Provides customizable logging functionality for Vue.js. Compatible with Vue2.

Demo

@ https://codepen.io/justinkames/pen/BwGOVQ

Introduction

vuejs-logger is a tool that enables configurable logging for Vue applications. Features include :

Output restriction based on selected loglevel.
Automatically JSON.stringify() the (reactive) properties passed to the logger.
Configurable options to customize output for a log messages.
Colored console messages for $log.warning, $log.error and $log.fatal.

logLevels :  ['debug', 'info', 'warn', 'error', 'fatal']

Install

This project uses node and npm.

https://www.npmjs.com/package/vuejs-logger

$ npm install vuejs-logger --save-exact

Usage

Below you can find an example of how to use vuejs-logger :

Properties

Name	Required	Type	Default	Description
isEnabled	false	Boolean	true	Enables the vuejs-logger plugin, useful toggle for production/development.
logLevel	false	String	'debug'	Choose between 'debug', 'info', 'warn', 'error', 'fatal'. Read production tips.
stringifyArguments	false	Boolean	false	If true, all input will go through JSON.stringify(). Useful when printing reactive properties.
showLogLevel	false	Boolean	false	If true, the loglevel will be shown.
showMethodName	false	Boolean	false	If true, the method name of the parent function will be shown in the console.
separator	false	String	' l '	The seperator between parts of the output ( see screenshot.
showConsoleColors	false	Boolean	false	If true, enables console.warn, console.fatal, console.error for corresponding loglevels.

Code example

import VueLogger from 'vuejs-logger';
const isProduction = process.env.NODE_ENV === 'production';
 
const options = {
    isEnabled: true,
    logLevel : isProduction ? 'error' : 'debug',
    stringifyArguments : false,
    showLogLevel : true,
    showMethodName : true,
    separator: '|',
    showConsoleColors: true
};

Vue.use(VueLogger, options);

new Vue({
    data() {
        return {
            a : 'a',
            b : 'b'
        }
    },
    created() {
        this.$log.debug('test', this.a, 123)
        this.$log.info('test', this.b)
        this.$log.warn('test')
        this.$log.error('test')
        this.$log.fatal('test')
        externalFunction()
    }
});

function externalFunction() {
   // log from external function
   Vue.$log.debug('log from function outside component.');
}

Screenshot

screen shot 2017-10-17 at 10 54 05

Production tips

The plugin can be disabled for production or a lower logLevel can be set to minimize output (as shown in usage ). If the logLevel is set to 'fatal' the plugin will ignore all calls with less important loglevels in the code.

    function foo() {
        // these statements will print nothing if the logLevel is set to 'fatal'. But they will compile just fine. 
        this.$log.debug('test', 'bar')
        this.$log.info('test')
        this.$log.warn('test')
        this.$log.error('test', 'foo')
        // this statement will print if the logLevel is set to 'fatal'
        this.$log.fatal('test', 'bar', 123)
    }