@dash0/sdk-web/src/utils/span-id.ts

Dash0's Web SDK to collect telemetry from end-users' web browsers

import { generateUniqueId, SPAN_ID_BYTES } from "./id";
import { crc32 } from "./crc32";

export function generateSpanId(traceId: string): string {
  const checksum = crc32(traceId);
  const prefix = checksum.toString(16).padStart(8, "0");

  return `${prefix}${generateUniqueId(SPAN_ID_BYTES - 4)}`;
}