exiftool-vendored
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    Function isZoneValid

    • Type guard to check if a Zone is valid and usable.

      A zone is considered valid if it:

      • Is not null/undefined
      • Has isValid === true (Luxon requirement)
      • Is not the library's UnsetZone sentinel
      • Has an offset within ±14 hours (the valid range for real-world timezones)

      This is the canonical validation check used throughout the library.

      Parameters

      • zone: Maybe<Zone<boolean>>

        Zone to validate

      Returns zone is Zone<true>

      true if the zone is valid and usable (type guard)

      const zone = Info.normalizeZone("America/Los_Angeles")
      if (isZoneValid(zone)) {
        // TypeScript knows zone is Zone (not Zone | undefined)
        console.log(zone.name)
      }

      isZoneValid(Info.normalizeZone("invalid"))  // false
      isZoneValid(Info.normalizeZone("UTC+8"))    // true
      isZoneValid(UnsetZone)                      // false
      isZoneValid(Info.normalizeZone("UTC+20"))   // false (beyond ±14 hours)

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