commit a6d5309093030f128caf803963907a224c990e0a
author martinprobst <martinprobst@google.com> Wed Jan 31 16:07:45 2018 +0100
committer Florian Weikert <fwe@google.com> Fri Jul 27 18:27:59 2018 +0200
tree 67e0a9387f6110f83356bb69d08f458389caaa30
parent f37114bec1db05699bb5b71fdf45c2124884f83c

Make it more convenient to get a perf trace for TypeScript compilation.

Only enabling perf_trace for a specific label also avoids having to rebuild all of its transitive dependencies when changing the flag.

Usage:
  bazel build --define TYPESCRIPT_PERF_TRACE_TARGET=//some:target //whatever:target
PiperOrigin-RevId: 183985921

internal/common/compilation.bzl

diff --git a/internal/common/compilation.bzl b/internal/common/compilation.bzl
index 5125c27..995baaa 100644
--- a/internal/common/compilation.bzl
+++ b/internal/common/compilation.bzl
@@ -203,6 +203,8 @@
   # The trace file location will be printed as a build result and can be read
   # in Chrome's chrome://tracing/ UI.
   perf_trace = False
+  if "TYPESCRIPT_PERF_TRACE_TARGET" in ctx.var:
+    perf_trace = str(ctx.label) == ctx.var["TYPESCRIPT_PERF_TRACE_TARGET"]
 
   compilation_inputs = input_declarations + extra_dts_files + srcs
   tsickle_externs_path = tsickle_externs[0] if tsickle_externs else None