add transaction pointer to both span type and span class

Author: lobsterkatie

packages/tracing/src/span.ts

@@ -1,5 +1,5 @@
 /* eslint-disable max-lines */
-import { Span as SpanInterface, SpanContext } from '@sentry/types';
+import { Span as SpanInterface, SpanContext, Transaction } from '@sentry/types';
 import { dropUndefinedKeys, timestampWithMs, uuid4 } from '@sentry/utils';
 
 import { SpanStatus } from './spanstatus';
@@ -99,6 +99,11 @@ export class Span implements SpanInterface, SpanContext {
    */
   public spanRecorder?: SpanRecorder;
 
+  /**
+   * @inheritDoc
+   */
+  public transaction?: Transaction;
+
   /**
    * You should never call the constructor manually, always use `hub.startSpan()`.
    * @internal

packages/types/src/span.ts

@@ -1,3 +1,5 @@
+import { Transaction } from './transaction';
+
 /** Interface holding all properties that can be set on a Span on creation. */
 export interface SpanContext {
   /**
@@ -84,6 +86,11 @@ export interface Span extends SpanContext {
    */
   data: { [key: string]: any };
 
+  /**
+   * The transaction containing this span
+   */
+  transaction?: Transaction;
+
   /**
    * Sets the finish timestamp on the current span.
    * @param endTimestamp Takes an endTimestamp if the end should not be the time when you call this function.