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

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

export const SPAN_ID_BYTES = 8;
export const TRACE_ID_BYTES = 16;
export const PAGE_LOAD_ID_BYTES = TRACE_ID_BYTES;
export const SESSION_ID_BYTES = SPAN_ID_BYTES;
export const TAB_ID_BYTES = SPAN_ID_BYTES;
export const WEB_EVENT_ID_BYTES = SPAN_ID_BYTES;

const SHARED_CHAR_CODES_ARRAY = Array(32);
export function generateUniqueId(byteCount: number): string {
  for (let i = 0; i < byteCount * 2; i++) {
    SHARED_CHAR_CODES_ARRAY[i] = Math.floor(Math.random() * 16) + 48;
    // valid hex characters in the range 48-57 and 97-102
    if (SHARED_CHAR_CODES_ARRAY[i] >= 58) {
      SHARED_CHAR_CODES_ARRAY[i] += 39;
    }
  }
  return String.fromCharCode.apply(null, SHARED_CHAR_CODES_ARRAY.slice(0, byteCount * 2));
}