chenglou/pretext · error · Error

Invalid value for --${name}: ${raw}

Error message

Invalid value for --${name}: ${raw}

What it means

parseNumberFlag() in letter-spacing-check.ts mirrors the same helper in keep-all-check.ts: it parses a `--<name>=<value>` numeric flag and throws when Number.parseInt yields a non-finite value. It guards the port/timeout flags for the letter-spacing oracle runner.

Source

Thrown at scripts/letter-spacing-check.ts:102

  requestId?: string
  results?: Array<{
    label: string
    report: ProbeReport
  }>
  message?: string
}

function parseStringFlag(name: string): string | null {
  const prefix = `--${name}=`
  const arg = process.argv.find(value => value.startsWith(prefix))
  return arg === undefined ? null : arg.slice(prefix.length)
}

function parseNumberFlag(name: string, fallback: number): number {
  const raw = parseStringFlag(name)
  if (raw === null) return fallback
  const parsed = Number.parseInt(raw, 10)
  if (!Number.isFinite(parsed)) throw new Error(`Invalid value for --${name}: ${raw}`)
  return parsed
}

function parseBrowsers(value: string | null): AutomationBrowserKind[] {
  const raw = (value ?? 'chrome,safari').trim()
  if (raw.length === 0) return ['chrome', 'safari']

  const browsers = raw
    .split(',')
    .map(part => part.trim().toLowerCase())
    .filter(Boolean)

  for (const browser of browsers) {
    if (browser !== 'chrome' && browser !== 'safari' && browser !== 'firefox') {
      throw new Error(`Unsupported browser ${browser}`)
    }
  }

View on GitHub (pinned to ac49b09b7d)

Solutions

1. Supply an integer for the named flag, e.g. `--port=3210` / `--timeout=60000`.
2. Omit the flag to accept the fallback default.
3. Confirm the flag name in the message is one actually consumed by letter-spacing-check.ts.

Example fix

# before
bun run letter-spacing-check -- --timeout=fast

# after
bun run letter-spacing-check -- --timeout=60000

function readNumberFlag(name: string, fallback: number): number {
  const prefix = `--${name}=`
  const arg = process.argv.find(v => v.startsWith(prefix))
  if (arg === undefined) return fallback
  const raw = arg.slice(prefix.length)
  const n = Number.parseInt(raw, 10)
  if (!Number.isFinite(n)) {
    console.error(`--${name} expects an integer, got: ${JSON.stringify(raw)}`)
    process.exit(2)
  }
  return n
}

const isIntegerString = (v: string): boolean => /^-?\d+$/.test(v.trim())

When it happens

Trigger: Running `bun run letter-spacing-check -- --port=abc`, `--timeout=` (empty), or any value where base-10 parseInt is NaN.

Common situations: Typo in a wrapper script, an unexpanded shell variable, or a stale flag value.

Related errors

• Invalid value for --${name}: ${raw}
• --step must be > 0
• Missing --id or --all. Available corpora: ${sources.map(sour
• Invalid value for --${name}: ${raw}
• Missing --id. Available corpora: ${sources.map(source => sou

AI-assisted analysis of chenglou/pretext@ac49b09b7d (2026-08-12). Data as JSON: /api/errors/486b64b265b8487b. Report an issue: GitHub.