From b0e2b850487d91b4ef8f101d64ef481689d5c875 Mon Sep 17 00:00:00 2001
From: KristianFJones <me@kristianjones.dev>
Date: Sun, 5 Apr 2020 16:15:21 +0000
Subject: [PATCH] fix(resolve): Don't run findFiles if we can already see an
 extension.

---
 src/index.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index 00065bf..11b52b3 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -18,10 +18,11 @@ const rootModulePath = `${process.cwd()}/`;
 const baseURL = pathToFileURL(rootModulePath).href;
 
 const relativePathRegex = /^\.{1,2}[/]/;
+const hasExtensionRegex = /\.\w+$/;
 
 // TODO: Allow customization of extensions
 const extensions = ['.ts', '.tsx'];
-const extensionsRegex = new RegExp(`\\${extensions.join('$|\\')}`);
+const extensionsRegex = new RegExp(`\\${extensions.join('|\\')}`);
 
 // Custom resolver to allow `.ts` and `.tsx` extensions, along with finding files if no extension is provided.
 export async function resolve(
@@ -39,14 +40,14 @@ export async function resolve(
     // Node.js normally errors on unknown file extensions, so return a URL for
     // specifiers ending in the TypeScript file extensions.
     return {
-      url: new URL(specifier, parentURL).href,
+      url: resolvedUrl.href,
     };
   }
 
   /**
    * If no extension is passed and is a relative import then let's try to find a `.ts` or `.tsx` file at the path
    */
-  if (relativePathRegex.test(specifier)) {
+  if (relativePathRegex.test(specifier) && !hasExtensionRegex.test(fileName)) {
     const filePath = fileURLToPath(resolvedUrl);
 
     const file = await findFiles(dirname(filePath), {