PostCSS Gap Properties lets you use the gap, column-gap, and row-gap shorthand properties in CSS, following the CSS Grid Layout specification.

.standard-grid {
	gap: 20px;
}
.spaced-grid {
	column-gap: 40px;
	row-gap: 20px;
}
/* becomes */
.standard-grid {
	grid-gap: 20px;
	gap: 20px;
}
.spaced-grid {
	grid-column-gap: 40px;
	column-gap: 40px;
	grid-row-gap: 20px;
	row-gap: 20px;
}

Add PostCSS Gap Properties to your project:

npm install postcss postcss-gap-properties --save-dev

Use PostCSS Gap Properties to process your CSS:

import postcssGapProperties from 'postcss-gap-properties';
postcssGapProperties.process(YOUR_CSS /*, processOptions, pluginOptions */);

Or use it as a PostCSS plugin:

import postcss from 'postcss';
import postcssGapProperties from 'postcss-gap-properties';
postcss([
  postcssGapProperties(/* pluginOptions */)
]).process(YOUR_CSS /*, processOptions */);

PostCSS Gap Properties runs in all Node environments, with special instructions for:

The preserve option determines whether the original gap declaration should remain in the CSS. By default, the original declaration is preserved.