From ff5b66e02c7c93b1352196a851758142c7df7031 Mon Sep 17 00:00:00 2001
From: Tony Ross <785009+antross@users.noreply.github.com>
Date: Wed, 11 Nov 2020 17:09:57 -0600
Subject: [PATCH] Fix duplicate output with multiple entry points

On Windows the normalized paths in resolveId end up in POSIX format.
This cause rollup to treat the returned path as a new piece of content.
This in turn results in duplicate output for references across entry points.

Fixed by normalizing the path to use host OS separators before returning.
---
 src/index.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index 9749d4e1..f7222a58 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -12,7 +12,7 @@ import { parseTsConfig } from "./parse-tsconfig";
 import { printDiagnostics } from "./print-diagnostics";
 import { TSLIB, TSLIB_VIRTUAL, tslibSource, tslibVersion } from "./tslib";
 import { blue, red, yellow, green } from "colors/safe";
-import { relative, dirname, resolve as pathResolve } from "path";
+import { relative, dirname, normalize as pathNormalize, resolve as pathResolve } from "path";
 import { normalize } from "./normalize";
 import { satisfies } from "semver";
 import findCacheDir from "find-cache-dir";
@@ -166,7 +166,7 @@ const typescript: PluginImpl<RPT2Options> = (options) =>
 				context.debug(() => `${blue("resolving")} '${importee}' imported by '${importer}'`);
 				context.debug(() => `    to '${resolved}'`);
 
-				return resolved;
+				return pathNormalize(resolved);
 			}
 
 			return;