tailwindcss/src/util/getAllConfigs.js

import defaultConfig from '../../stubs/defaultConfig.stub.js'
import { flagEnabled } from '../featureFlags'

export default function getAllConfigs(config) {
  const configs = (config?.presets ?? [defaultConfig])
    .slice()
    .reverse()
    .flatMap((preset) => getAllConfigs(preset instanceof Function ? preset() : preset))

  const features = {
    // Add experimental configs here...
  }

  const experimentals = Object.keys(features)
    .filter((feature) => flagEnabled(config, feature))
    .map((feature) => features[feature])

  return [config, ...experimentals, ...configs]
}