From d3eee5a5c8d047aff399af0ea39f36c24e6fc937 Mon Sep 17 00:00:00 2001
From: Charles Lyding <19598772+clydin@users.noreply.github.com>
Date: Tue, 7 Aug 2018 17:22:30 -0400
Subject: [PATCH] fix(@ngtools/webpack): resolve relative host replacement
 paths

Fixes: #11801
---
 packages/ngtools/webpack/src/angular_compiler_plugin.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/ngtools/webpack/src/angular_compiler_plugin.ts b/packages/ngtools/webpack/src/angular_compiler_plugin.ts
index faebb2f56988..fad93d665352 100644
--- a/packages/ngtools/webpack/src/angular_compiler_plugin.ts
+++ b/packages/ngtools/webpack/src/angular_compiler_plugin.ts
@@ -597,8 +597,11 @@ export class AngularCompilerPlugin {
           replacements = new Map();
           const aliasHost = new virtualFs.AliasHost(host);
           for (const from in this._options.hostReplacementPaths) {
-            const normalizedFrom = normalize(from);
-            const normalizedWith = normalize(this._options.hostReplacementPaths[from]);
+            const normalizedFrom = resolve(normalize(this._basePath), normalize(from));
+            const normalizedWith = resolve(
+              normalize(this._basePath),
+              normalize(this._options.hostReplacementPaths[from]),
+            );
             aliasHost.aliases.set(normalizedFrom, normalizedWith);
             replacements.set(normalizedFrom, normalizedWith);
           }