From 2414f1b3e0bd21425c356a77f198b2dcbae9c22d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20V=C3=A1zquez=20P=C3=BAa?= <davazp@gmail.com>
Date: Tue, 4 Jun 2019 15:39:33 +0200
Subject: [PATCH] Increase instance version when new root files are added

Fixes #943
---
 src/index.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/index.ts b/src/index.ts
index 82b112e9c..5e189d3b5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -423,6 +423,17 @@ function updateFileInCache(
     instance.changedFilesList = true;
   }
 
+  // instance.version must be increased when a new root file is added.
+  //
+  // Note that the file could actually be in the cache if it was found
+  // as a dependency before.
+  //
+  // See https://github.com/TypeStrong/ts-loader/issues/943
+  //
+  if (!instance.rootFileNames.has(filePath)) {
+    instance.version!++;
+  }
+
   if (instance.watchHost !== undefined && contents === undefined) {
     fileWatcherEventKind = instance.compiler.FileWatcherEventKind.Deleted;
   }