Function addChildSpanToSpan

packages/core/src/utils/spanUtils.ts:372–385

(span: SpanWithPotentialChildren, childSpan: Span)

 * Adds an opaque child span reference to a span.
 */
export function addChildSpanToSpan(span: SpanWithPotentialChildren, childSpan: Span): void {
  // We store the root span reference on the child span
  // We need this for `getRootSpan()` to work
  const rootSpan = span[ROOT_SPAN_FIELD] || span;
  addNonEnumerableProperty(childSpan as SpanWithPotentialChildren, ROOT_SPAN_FIELD, rootSpan);

  // We store a list of child spans on the parent span
  // We need this for `getSpanDescendants()` to work
  if (span[CHILD_SPANS_FIELD]) {
    span[CHILD_SPANS_FIELD].add(childSpan);
  } else {
    addNonEnumerableProperty(span, CHILD_SPANS_FIELD, new Set([childSpan]));
  }
}

/** This is only used internally by Idle Spans. */
export function removeChildSpanFromSpan(span: SpanWithPotentialChildren, childSpan: Span): void {