Function resolveThemeColor

packages/tailwindcss/src/utilities.ts:246–283

* Finds a color in the theme under one of the given theme keys that matches * `candidateValue`. * * The values `inherit`, `transparent` and `current` are special-cased as they * are universal and don't need to be resolved from the theme.

(
  candidate: Extract<Candidate, { kind: 'functional' }>,
  theme: Theme,
  themeKeys: T[],
)

 * are universal and don't need to be resolved from the theme.
 */
function resolveThemeColor<T extends ThemeKey>(
  candidate: Extract<Candidate, { kind: 'functional' }>,
  theme: Theme,
  themeKeys: T[],
) {
  if (process.env.NODE_ENV === 'test') {
    if (!candidate.value) {
      throw new Error('resolveThemeColor must be called with a named candidate')
    }

    if (candidate.value.kind !== 'named') {
      throw new Error('resolveThemeColor must be called with a named value')
    }
  }

  let value: string | null = null

  switch (candidate.value!.value) {
    case 'inherit': {
      value = 'inherit'
      break
    }
    case 'transparent': {
      value = 'transparent'
      break
    }
    case 'current': {
      value = 'currentcolor'
      break
    }
    default: {
      value = theme.resolve(candidate.value!.value, themeKeys)
      break
    }
  }

  return value ? asColor(value, candidate.modifier, theme) : null
}

/**
 * The alpha and beta releases used `_` in theme keys to represent a `.`. This meant we used