sizes-extent

When given the sizes attribute of a responsive image and a range of screen widths, will calculate the maximum and minimum CSS pixel widths of the image that will be displayed.

Installation

$ npm install --save sizes-extent

Usage

const sizesExtent = require('sizes-extent');

sizesExtent('(max-width: 1000px) 100vw, 30vw'); // [300, 1000]

It can handle pretty much anything you throw at it—even calc() (although only simple calculations). See the test cases for some complicated examples.

If something doesn't work, open an issue and I'll fix it (or send a PR!)

If given invalid input or input it doesn't understand, it'll return null.

License

Released under the MIT license.