From 6662234894c461a4051305841ceb623f23f4d1f2 Mon Sep 17 00:00:00 2001
From: Nicolas HENRY <icewil@gmail.com>
Date: Thu, 10 May 2018 06:44:53 +0200
Subject: [PATCH] fix(v5-builder): stop transforming "declare" classes (#2503)

---
 scripts/build/transformers/plugin-class.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/build/transformers/plugin-class.ts b/scripts/build/transformers/plugin-class.ts
index c6f353500..ccc4c56b1 100644
--- a/scripts/build/transformers/plugin-class.ts
+++ b/scripts/build/transformers/plugin-class.ts
@@ -57,7 +57,8 @@ function transformClasses(
   return ts.visitEachChild(
     file,
     node => {
-      if (node.kind !== ts.SyntaxKind.ClassDeclaration) {
+      if (node.kind !== ts.SyntaxKind.ClassDeclaration
+          || (node.modifiers && node.modifiers.find(v => v.kind === ts.SyntaxKind.DeclareKeyword))) {
         return node;
       }
       return transformClass(node, ngcBuild);