Awesome Logging

awesome-logging is a collection of fancy text outputs and inputs for CLI tools written in NodeJS. No matter what you want to log to the terminal or what information you need from the user, awesome-logging will help you do so.

• You want to show the progress of a certain task while also logging messages to the terminal while keeping everythign nice and formatted? No problem.
• You want the user to select one or multiple options of a given list? No problem!
• You want to log messages in the background while showing a fancy animation or a prompt to the user? No problem!

Key functionality

• Written in TypeScript (Strongly typed)
• Live-update logging messages in a reliable way
• Multi-line logging
• Loading animations and progress bars
• Interactive prompts to get user input
• Interrupt currently playing animations with regular log entries
• Extendable design (add your own loggers / prompts)

Installation

yarn add awesome-logging
// or
npm i awesome-logging

Examples

import { AwesomeLogger } from 'awesome-logger';

// Example: Simple text logging
AwesomeLogger.log('Welcome to awesome-logging!');
const logControl = AwesomeLogger.log('Is this a logging library?');
setTimeout(() => logControl.setText('This is an awesome-logging library!'), 1500);
setTimeout(() => logControl.setText('Cool!'), 3000);

// Example: Simple text logging (with line breaks)
const textA = 'One line of text...';
const textB = 'Multiple\nLines\nof Text!';
let state = true;
const logControl = AwesomeLogger.log(textA);
setInterval(() => {
  state = !state;
  logControl.setText(state ? textA : textB);
}, 1000);

// Example: Progress Bar
const logProgressControl = AwesomeLogger.log('progress', {
  totalProgress: 100,
  text: 'Very important progress:'
});

let i = 0;
const interval = setInterval(() => {
  logProgressControl.setProgress(i++);
  if (i === 100) {
    clearInterval(interval);
  }
}, 500);

AwesomeLogger Methods

AwesomeLogger.create(loggerType, loggerOptions): LoggerControl

AwesomeLogger.log(text): LoggerControl
AwesomeLogger.log(logger): LoggerControl
AwesomeLogger.log(loggerType, loggerOptions): LoggerControl

AwesomeLogger.prompt(promptType, promptOptions): PromptControl
AwesomeLogger.interrupt(text): void

Logger types

Text

The simplest of all loggers; logs any printable string, no matter if one, or multiple lines.

LoggerOptions

Option	type	description	default
text	string	The text that should be logged.	''

LoggerControl

Method	returnType	description
setText(text: string)	void	Sets a new text to the logger.

---

Spinner

Logs a loading spinner with a custom loading animation and text.

LoggerOptions

Option	type	description	default
text	string	The description text of the loading spinner.	''
spinnerFrames	string[]	The array of strings that are used for the animation.	['. ', '.. ', '...', '.. ']
spinnerDelay	number	The amount of ms between each spinnerframe.	500

LoggerControl

Method	returnType	description
stop(options: { succeeded?: boolean; removeLine?: boolean; text?: string })	void	Stops the spinner and changes the logging accordingly to the provided options.

---

Progress

Loggs a progressbar with optional text.

LoggerOptions

Option	type	description	default
totalProgress	number	The maximum number the progress can reach.	100
text	string	The text that is displayed in front of the bar.	''
completedText	string	The text that is displayed when the progress reaches 100%.	''
unfilledChar	string	The character that is pronted for the uncompleted section of the bar.	'·'
filledChar	string	The character that is pronted for the completed section of the bar.	'■'
borderChar	string	The caharter that is printed on the left and right of the bar.	'■'
maxWidth	number	The maximum cound characters the progressbar can have can.	Terminal Width
borderColor	AwesomeLoggerColor	The color of the border chars.	'GRAY'
unfilledColor	AwesomeLoggerColor	The color of the uncompleted part of the bar.	'GRAY'
filledColor	AwesomeLoggerColor	The color of the completed part of the bar.	'WHITE'

Note: For performance reasons do not specify the colors of unfilled or filled characters directly in the string option, but by the dedicated color option.

LoggerControl

Method	returnType	description
setProgress(progress: number, text?: string)	void	Sets the current progress and optionally a new text.

---

Checklist

Logs a list of items that have a certain state like 'pending', 'inProgress', 'succeeded' and more.

LoggerOptions

Option	type	description	default
items	AwesomeChecklistLoggerItem	All items that are part of the checklist.	[]

LoggerControl

Method	returnType	description
changeState(index: number, state: AwesomeChecklistLoggerState, newText?: string)	void	Changes the state of one item based on the index. Optionally sets a new text for that item.

---

Multi

Combines multiple loggers that were created previously and loggs them below each other.

LoggerOptions

Option	type	description	default
children	AwesomeLoggerBase[]	The array of loggers that were created previously.	[]

LoggerControl

Method	returnType	description
getChild<T extends AwesomeLoggerBase>(index: number)	T	Returns the child at the given index. Be cautious as you have to be sure what kind of logger is present at the provided index.

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