Function createViteLogger

packages/vitest/src/node/viteLogger.ts:38–136

(
  console: VitestLogger,
  level: LogLevel = 'info',
  options: LoggerOptions = {},
)

// When Vitest supports only Vite 6 and above, we can use Vite's `createLogger({ console })`
// https://github.com/vitejs/vite/pull/18379
export function createViteLogger(
  console: VitestLogger,
  level: LogLevel = 'info',
  options: LoggerOptions = {},
): Logger {
  const loggedErrors = new WeakSet<Error | Rollup.RollupError>()
  const { prefix = '[vite]', allowClearScreen = true } = options
  const thresh = LogLevels[level]
  const canClearScreen
    = allowClearScreen && process.stdout.isTTY && !process.env.CI
  const clear = canClearScreen ? clearScreen : () => {}

  function format(type: LogType, msg: string, options: LogErrorOptions = {}) {
    if (options.timestamp) {
      let tag = ''
      if (type === 'info') {
        tag = colors.cyan(colors.bold(prefix))
      }
      else if (type === 'warn') {
        tag = colors.yellow(colors.bold(prefix))
      }
      else {
        tag = colors.red(colors.bold(prefix))
      }
      const environment = (options as any).environment ? `${(options as any).environment} ` : ''
      return `${colors.dim(getTimeFormatter().format(new Date()))} ${tag} ${environment}${msg}`
    }
    else {
      return msg
    }
  }

  function output(type: LogType, msg: string, options: LogErrorOptions = {}) {
    if (thresh >= LogLevels[type]) {
      const method = type === 'info' ? 'log' : type

      if (options.error) {
        loggedErrors.add(options.error)
      }
      if (canClearScreen) {
        if (type === lastType && msg === lastMsg) {
          sameCount++
          clear(console)
          console[method](
            format(type, msg, options),
            colors.yellow(`(x${sameCount + 1})`),
          )
        }
        else {
          sameCount = 0
          lastMsg = msg
          lastType = type
          if (options.clear) {
            clear(console)
          }
          console[method](format(type, msg, options))
        }
      }