From 7b6ea973f6422828e4d64e51b16f4ded0e846636 Mon Sep 17 00:00:00 2001
From: Pete Bacon Darwin <pete@bacondarwin.com>
Date: Wed, 11 Nov 2020 15:29:42 +0000
Subject: [PATCH] refactor(compiler-cli): return the `FileSystem` from
 `initMockFileSystem()` (#39617)

It is common to want to use the file system once it is initialized,
so it makes sense for this function to return it.

PR Close #39617
---
 .../src/ngtsc/file_system/testing/src/test_helper.ts           | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts b/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts
index d90af9c89f..28bd7b7bdd 100644
--- a/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts
+++ b/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts
@@ -66,10 +66,11 @@ runInEachFileSystem.unix = (callback: (os: string) => void) =>
 runInEachFileSystem.windows = (callback: (os: string) => void) =>
     runInFileSystem(FS_WINDOWS, callback, true);
 
-export function initMockFileSystem(os: string, cwd?: AbsoluteFsPath): void {
+export function initMockFileSystem(os: string, cwd?: AbsoluteFsPath): MockFileSystem {
   const fs = createMockFileSystem(os, cwd);
   setFileSystem(fs);
   monkeyPatchTypeScript(os, fs);
+  return fs;
 }
 
 function createMockFileSystem(os: string, cwd?: AbsoluteFsPath): MockFileSystem {