From ae884b1a38faf6d8e5269b8d4958d37910bcc0ed Mon Sep 17 00:00:00 2001
From: Andrew Casey <amcasey@users.noreply.github.com>
Date: Tue, 16 Mar 2021 10:57:10 -0700
Subject: [PATCH] Fix dump of tracing legend (#43263)

---
 src/compiler/tracing.ts                      | 1 +
 src/executeCommandLine/executeCommandLine.ts | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/compiler/tracing.ts b/src/compiler/tracing.ts
index 151eb3d311d..c9b7e3ca991 100644
--- a/src/compiler/tracing.ts
+++ b/src/compiler/tracing.ts
@@ -331,4 +331,5 @@ namespace ts { // eslint-disable-line one-namespace-per-file
 
     // define after tracingEnabled is initialized
     export const startTracing = tracingEnabled.startTracing;
+    export const dumpTracingLegend = tracingEnabled.dumpLegend;
 }
diff --git a/src/executeCommandLine/executeCommandLine.ts b/src/executeCommandLine/executeCommandLine.ts
index bfe40e661cd..a926f474dd5 100644
--- a/src/executeCommandLine/executeCommandLine.ts
+++ b/src/executeCommandLine/executeCommandLine.ts
@@ -501,7 +501,7 @@ namespace ts {
         updateSolutionBuilderHost(sys, cb, buildHost);
         const builder = createSolutionBuilder(buildHost, projects, buildOptions);
         const exitStatus = buildOptions.clean ? builder.clean() : builder.build();
-        tracing?.dumpLegend();
+        dumpTracingLegend(); // Will no-op if there hasn't been any tracing
         return sys.exit(exitStatus);
     }