npm install @csstools/postcss-media-minmax --save-dev

PostCSS Media MinMax lets you use the range notation in media queries following the Media Queries 4 Specification.

@media screen and (width >=500px) and (width <=1200px) {
	.bar {
		display: block;
	}
}

/* becomes */

@media screen and (min-width:500px) and (max-width:1200px) {
	.bar {
		display: block;
	}
}

Add PostCSS Media MinMax to your project:

npm install postcss @csstools/postcss-media-minmax --save-dev

Use it as a PostCSS plugin:

const postcss = require('postcss');
const postcssMediaMinMax = require('@csstools/postcss-media-minmax');

postcss([
	postcssMediaMinMax(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

PostCSS Media MinMax runs in all Node environments, with special instructions for:

• Node
• PostCSS CLI
• PostCSS Load Config
• Webpack
• Next.js
• Gulp
• Grunt

See prior work by yisibl here postcss-media-minmax To ensure long term maintenance and to provide the needed features this plugin was recreated based on yisibl's work.