Log-lv NPM | npm.io

Log LV

Log level for both client and server written in pure TypeScript

Usage

import { Logger } from "log-lv";
const loggerInstance = new Logger("debug", {
    prefix: () => new Date().toISOString(),
    suffix: () => "SUFFIX",
    leftSeparator: ">>>",
    rightSeparator: "<<<"
});
loggerInstance.debug("MY", "MESSAGE");

// Output:
// 2020-04-30T22:50:08.683Z >>> [DEBUG] MY MESSAGE <<< SUFFIX

Logger configuration

The first parameter is the initial log level. It can be changed also at runtime with the setLevel method.

Type	Options	Default Value
string	`none`, `error`, `warning`, `info`, `verbose`, `debug`	`info`

The second (optional) parameter to be passed to the Logger constructor has the following properties

Property	Type	Description	Default Value
prefix	`() => string`	The returned value of this function will be printed as prefix	""
suffix	`() => string`	The returned value of this function will be printed as suffix	""
leftSeparator	`string`	Separator string between the prefix and the message. If prefix is not provided this value will be ignored	""
leftSeparator	`string`	Separator string between the message and the suffix. If suffix is not provided this value will be ignored	""
beforeLogging	`(string[], string, number) => void`	Callback function executed before logging to console. An array of string parts used for logging the message will be passed as argument	""
leftSeparator	`(string[], string, number) => void`	Callback function executed after logging to console. An array of string parts used for logging the message will be passed as argument	""

API

Method	Type Definition	Description
error	`(...args: any[]) => void`	Display error message
warning	`(...args: any[]) => void`	Display warning message
info	`(...args: any[]) => void`	Display info message
verbose	`(...args: any[]) => void`	Display verbose message
debug	`(...args: any[]) => void`	Display debug message
setLevel	`(level: string) => void`	Change log level
getLevel	`() => number`	Get current log level
getLevelName	`() => LevelString`	Get current log level name
disableLogging	`() => Logger`	Disables logging
setLevelError	`() => Logger`	Set log level to Error
setLevelWarning	`() => Logger`	Set log level to Warning
setLevelInfo	`() => Logger`	Set log level to Info
setLevelVerbose	`() => Logger`	Set log level to Verbose
setLevelDebug	`() => Logger`	Set log level to Debug