Function sampledChecksum

packages/core/src/util/encode.ts:32–51

(content: string, limit = 500_000)

}

export function sampledChecksum(content: string, limit = 500_000): string | undefined {
  if (!content) return undefined
  if (content.length <= limit) return checksum(content)

  const size = 4096
  const points = [
    0,
    Math.floor(content.length * 0.25),
    Math.floor(content.length * 0.5),
    Math.floor(content.length * 0.75),
    content.length - size,
  ]
  const hashes = points
    .map((point) => {
      const start = Math.max(0, Math.min(content.length - size, point - Math.floor(size / 2)))
      return checksum(content.slice(start, start + size)) ?? ""
    })
    .join(":")
  return `${content.length}:${hashes}`
}