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Custom preprocessor config

The build option sveltePreprocessConfig takes the path for file with a function exported. This function will be evaluated and used as the Svelte preprocess options. The optionsparameter of the function include all build options from the builder. Youre able to access everything defined in the builder. Additionally theres the field projectRoot with the path of the project relative to the Nx workspace root.

function setSveltePreprocessOptions(options) {
  return {
    postcss: {
      plugins: [
        require('postcss-nested')(), // Remove if you can't wan't to use nested structures.
        require('tailwindcss')(options.projectRoot + '/tailwind.config.js'),

module.exports = setSveltePreprocessOptions;

A example how to add TailwindCSS.