Tailwind Custom Colors Not Complied

On npm start (craco start) everything works fine and colors are being compiled.

When running npm run build (craco build) though, only one color of each configuration is being compiled, dallas from theme.textColor and vista-white from theme.gradientColorStops.

I tried:

Reordering theme.textColor properties.
Deleting node_modules and npm i.
Deleting the build and rebuilding.

// craco.config.js
module.exports = {
  style: {
    postcss: {
      plugins: [require('tailwindcss'), require('autoprefixer')],
    },
  },
};

// tailwind.config.js
module.exports = {
  purge: ['./src/**/*.{js,jsx,ts,tsx}', './public/index.html'],
  darkMode: false, // or 'media' or 'class'
  theme: {
    extend: {},
    textColor: (theme) => ({
      ...theme('colors'),
      dallas: '#664A2D',
      'blue-charcoal': '#24292E',
      denim: '#0D66C2',
      'spring-green': '#05E776',
      flamingo: '#E65A4D',
    }),
    gradientColorStops: (theme) => ({
      ...theme('colors'),
      'vista-white': '#E1DFDC',
    }),
  },
  variants: {
    extend: {},
  },
  plugins: [],
};

Solution

Thanks to @George for pointing out the problem:

Purge will not recognise your usage of this class. See https://tailwindcss.com/docs/optimizing-for-production#writing-purgeable-html. Specifically, "Don't use string concatenation to create class names". Purge is not 'smart' in any way, it works by matching your utilities against classes (or any string, really..) throughout your templates.

One possible solution is to add the classes that are being purged to purge.options.safelist:

// tailwind.config.js
module.exports = {
  // Added safelist
  purge: {
    content: ['./src/**/*.{js,jsx,ts,tsx}', './public/index.html'],
    options: {
      safelist: ['hover:text-blue-charcoal', 'hover:text-denim', 'hover:text-spring-green', 'hover:text-flamingo'],
    },
  },
  darkMode: false, // or 'media' or 'class'
  theme: {
    extend: {},
    textColor: (theme) => ({
      ...theme('colors'),
      dallas: '#664A2D',
      'blue-charcoal': '#24292E',
      denim: '#0D66C2',
      'spring-green': '#05E776',
      flamingo: '#E65A4D',
    }),
    gradientColorStops: (theme) => ({
      ...theme('colors'),
      'vista-white': '#E1DFDC',
    }),
  },
  variants: {
    extend: {},
  },
  plugins: [],
};