calibre/src/utils/formatters/grade-score.js

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import chalk from 'chalk'

const toGradeScore = score => {
  if (score >= 90) return chalk.green.bold(score)
  if (score > 50 && score < 90) return chalk.yellow.bold(score)
  if (score <= 50) return chalk.red.bold(score)
  return 'N/A'
}

export default toGradeScore