Using different Tailwind config files (eg. one for admin and one for front) with Laravel Mix (TailwindCSS < 1.0)

webpack.mix.js

const mix = require('laravel-mix');
const tailwindcss = require('tailwindcss');
require('laravel-mix-purgecss');

mix
    .js('resources/js/admin/admin.js', 'public/js')
    .js('resources/js/front/front.js', 'public/js')

    // Admin
    .sass(
        'resources/sass/admin.scss',
        'public/css/',
        {}, // sass-loader plugin options
        [tailwindcss('./tailwind-admin.js')] // postcss plugins
    )

    // Front
    .sass(
        'resources/sass/front.scss',
        'public/css/',
        {}, // sass-loader plugin options
        [tailwindcss('./tailwind-front.js')] // postcss plugins
    )
    .options({
        processCssUrls: false,
    })
    .sourceMaps();

if (mix.inProduction()) {
    mix
        .version()
        .purgeCss();
}