is-defined

Check if an identifier is defined

Usage no npm install needed!

<script type="module">
  import isDefined from 'https://cdn.skypack.dev/is-defined';
</script>

Check if an identifier is defined

$ npm install --save is-defined

var isDefined = require('is-defined')

isDefined('window')
//=> typeof window !== 'undefined'

Required
Type: string

A JavaScript identifier.