slidevjs/slidev · error · TypeError

Invalid timestamp value: ${match[1]}

Error message

Invalid timestamp value: ${match[1]}

What it means

Inside the unit-based parser, the regex ([\d.]+)([a-z]+) captured a value segment that Number() returned NaN for. In practice this is hard to hit because the regex requires digits/dots, but values like '.' (dot only) or unusual unicode digits can trigger it.

Source

Thrown at packages/parser/src/timesplit/timestring.ts:90

      hrs: 3600,
      hour: 3600,
      hours: 3600,
      day: 86400,
      days: 86400,
      week: 604800,
      weeks: 604800,
      month: 2629746,
      months: 2629746,
      year: 31556952,
      years: 31556952,
    }
    const regex = /([\d.]+)([a-z]+)/gi
    const matches = timestamp.matchAll(regex)
    if (matches) {
      for (const match of matches) {
        const value = Number(match[1])
        if (Number.isNaN(value)) {
          throw new TypeError(`Invalid timestamp value: ${match[1]}`)
        }
        const unit = match[2].toLowerCase()
        if (!(unit in unitMap)) {
          throw new TypeError(`Invalid timestamp unit: ${unit}`)
        }
        seconds += value * unitMap[unit]
      }
    }
    const remaining = timestamp.replace(regex, '').trim()
    if (remaining) {
      throw new TypeError(`Unknown timestamp remaining: ${remaining}`)
    }
  }

  return {
    seconds,
    relative,
  }

View on GitHub (pinned to 0d798ace58)

Solutions

1. Always supply at least one digit before the unit (5s not .s)
2. Avoid stray dots in the numeric portion
3. Use plain seconds (e.g. 5) for simple values

Example fix

// before
timesplit: .s
// after
timesplit: 1s

function validUnitValues(ts: string): boolean {
  return Array.from(ts.matchAll(/([\d.]+)([a-z]+)/gi)).every(m => Number.isFinite(Number(m[1])))
}

When it happens

Trigger: A unit-string segment whose numeric prefix is non-parseable, e.g. '.s' (no digits) or '..5s'.

Common situations: Hand-typed timestamps missing the leading digit, double dots, or unicode digit lookalikes.

Related errors

• Invalid timestamp format
• Invalid timestamp unit: ${unit}
• Unknown timestamp remaining: ${remaining}
• Timesplit end ${end} is before start ${ts}
• Invalid aspect ratio "${str}"

AI-assisted analysis of slidevjs/slidev@0d798ace58 (2026-08-12). Data as JSON: /api/errors/eb6db2f51abe5856. Report an issue: GitHub.