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 |