tailwindcss/src/plugins/gridAutoFlow.js

export default function() {
  return function({ addUtilities, variants, target }) {
    if (target('gridAutoFlow') === 'ie11') {
      return
    }

    addUtilities(
      {
        '.grid-flow-row': { gridAutoFlow: 'row' },
        '.grid-flow-col': { gridAutoFlow: 'column' },
        '.grid-flow-row-dense': { gridAutoFlow: 'row dense' },
        '.grid-flow-col-dense': { gridAutoFlow: 'column dense' },
      },
      variants('gridAutoFlow')
    )
  }
}