Package Exports

warn-once
warn-once/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (warn-once) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

warn-once

Print a warning exactly once during development. Suitable for deprecation warnings, warnings for missing setup etc.

Installation

Open a Terminal in the project root and run:

npm install warn-once

Usage

The warnOnce function accepts a condition as the first argument. If the condition is true, then it'll print a warning:

const warnOnce = require('warn-once');

// ...

warnOnce(someCondition, 'This is a warning message');

You can call warnOnce multiple times, but if the warning was printed already, it'll not be printed again.

The warning is only shown during development, i.e. if NODE_ENV is not set to 'production'.