Show a warning once
npm install warn-oncePrint a warning exactly once during development. Suitable for deprecation warnings, warnings for missing setup etc.
Open a Terminal in the project root and run:
``sh`
npm install warn-once
The warnOnce function accepts a condition as the first argument. If the condition is true, then it'll print a warning:
`js
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'`.