warning

What is warning?

The 'warning' npm package is a utility that allows developers to print warning messages to the console. It is typically used to alert developers of potential issues or misuses of an API that are not severe enough to warrant throwing an error. It is often used in development environments to provide guidance without interrupting the execution of the program.

What are warning's main functionalities?

Conditional warnings

This feature allows developers to conditionally display warning messages based on a boolean condition. If the condition is true, the warning message is printed to the console.

var warning = require('warning');

var shouldWarn = true;
warning(shouldWarn, 'This is a warning message that will only be displayed if shouldWarn is true.');

Other packages similar to warning

invariant

The 'invariant' package is similar to 'warning' in that it is used for development checks. However, 'invariant' will throw an error if the condition is not met, making it more suitable for critical issues that should not be ignored or bypassed.

debug

The 'debug' package is used for logging debug messages and is similar to 'warning' in that it provides a way to output messages to the console. However, 'debug' is more versatile as it allows for namespaced debug logs and can be enabled or disabled based on the environment or debug level.

chalk

While 'chalk' is not directly similar to 'warning' in functionality, it is often used in conjunction with warning messages to colorize console output, making the warnings more noticeable. 'chalk' itself is a styling library that allows developers to style their terminal string output.

README

Warning

A mirror of Facebook's Warning

Usage

npm install warning

// some script
var warning = require('warning');

var ShouldBeTrue = false;

warning(ShouldBeTrue, 'This thing should be true but you set to false. No soup
for you!');
//  'This thing should be true but you set to false. No soup for you!'

Similar to Facebook's invariant but only logs a warning if the condition is not met. This can be used to log issues in development environments in critical paths. Removing the logging code for production environments will keep the same logic and follow the same code paths.

Browserify

When using browserify, the browser.js file will be imported instead of invariant.js and browserify will be told to transform the file with envify. The only difference between browser.js and invariant.js is the process.env.NODE_ENV variable isn't cached. This, in combination with envify and (optionally) uglifyjs, will result in a noop in production environments. Otherwise behavior is as expected.

Don't Forget To Be Awesome

Changelog

2.1.0 (2015-10-04)

Features

• switch to loose-envify (dacc2da)

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