From b0ed37a401a12b139a193a3da4785e989a0b7159 Mon Sep 17 00:00:00 2001
From: Charles Lyding <19598772+clydin@users.noreply.github.com>
Date: Mon, 26 Oct 2020 22:22:26 -0400
Subject: [PATCH] fix(@angular-devkit/build-optimizer): set rxjs as having safe
 side effects

The rxjs package contains module level side effects that are not marked with a pure annotation.  However, these side effects are safe to remove if the values are unused.

(cherry picked from commit 1f5861c93750a42ecb9308a814689e3c30d142d6)
---
 .../build_optimizer/src/build-optimizer/build-optimizer.ts       | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/angular_devkit/build_optimizer/src/build-optimizer/build-optimizer.ts b/packages/angular_devkit/build_optimizer/src/build-optimizer/build-optimizer.ts
index 209f409c345e..65b93f2731ea 100644
--- a/packages/angular_devkit/build_optimizer/src/build-optimizer/build-optimizer.ts
+++ b/packages/angular_devkit/build_optimizer/src/build-optimizer/build-optimizer.ts
@@ -37,6 +37,7 @@ const knownSideEffectFreeAngularModules = [
   /[\\/]node_modules[\\/]@angular[\\/]upgrade[\\/]/,
   /[\\/]node_modules[\\/]@angular[\\/]material[\\/]/,
   /[\\/]node_modules[\\/]@angular[\\/]cdk[\\/]/,
+  /[\\/]node_modules[\\/]rxjs[\\/]/,
 ];
 
 // Factories created by AOT are known to have no side effects.