in projects/libs/flex-layout/flex/layout-gap/layout-gap.ts [297:310]
function getMarginType(directionality: string, layout: string) {
switch (layout) {
case 'column':
return 'margin-bottom';
case 'column-reverse':
return 'margin-top';
case 'row':
return directionality === 'rtl' ? 'margin-left' : 'margin-right';
case 'row-reverse':
return directionality === 'rtl' ? 'margin-right' : 'margin-left';
default :
return directionality === 'rtl' ? 'margin-left' : 'margin-right';
}
}