From 86203736e9d7b510816dad57101ae340db07be9d Mon Sep 17 00:00:00 2001
From: Alex Eagle <alexeagle@google.com>
Date: Fri, 13 Jul 2018 13:27:50 -0700
Subject: [PATCH] fix(service-worker): don't include sourceMappingURL in
 ngsw-worker (#24877)

Fixes #23596

PR Close #24877
---
 packages/service-worker/BUILD.bazel | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/service-worker/BUILD.bazel b/packages/service-worker/BUILD.bazel
index 8be9e9c52f..da9adc885f 100644
--- a/packages/service-worker/BUILD.bazel
+++ b/packages/service-worker/BUILD.bazel
@@ -30,7 +30,9 @@ genrule(
     name = "ngsw_worker_renamed",
     srcs = ["//packages/service-worker/worker:ngsw_worker.es6.js"],
     outs = ["ngsw-worker.js"],
-    cmd = "cp $< $@",
+    # Remove sourcemap since this file will be served in production site
+    # See https://github.com/angular/angular/issues/23596
+    cmd = "grep -v '//# sourceMappingURL' < $< > $@",
 )
 
 ng_package(