From bf03421f6f5a4a52862b30fe5f602d88fcfe2204 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wewigham@microsoft.com>
Date: Mon, 28 Mar 2022 16:51:48 -0700
Subject: [PATCH] Probably works

---
 src/compiler/moduleNameResolver.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/compiler/moduleNameResolver.ts b/src/compiler/moduleNameResolver.ts
index da2324cc74ecb..2149d0def95ac 100644
--- a/src/compiler/moduleNameResolver.ts
+++ b/src/compiler/moduleNameResolver.ts
@@ -1498,9 +1498,9 @@ namespace ts {
     }
 
     function loadJSOrExactTSFileName(extensions: Extensions, candidate: string, onlyRecordFailures: boolean, state: ModuleResolutionState): PathAndExtension | undefined {
-        if ((extensions === Extensions.TypeScript || extensions === Extensions.DtsOnly) && fileExtensionIsOneOf(candidate, [Extension.Dts, Extension.Dcts, Extension.Dmts])) {
+        if ((extensions === Extensions.TypeScript || extensions === Extensions.DtsOnly) && fileExtensionIsOneOf(candidate, supportedTSExtensionsFlat)) {
             const result = tryFile(candidate, onlyRecordFailures, state);
-            return result !== undefined ? { path: candidate, ext: forEach([Extension.Dts, Extension.Dcts, Extension.Dmts], e => fileExtensionIs(candidate, e) ? e : undefined)! } : undefined;
+            return result !== undefined ? { path: candidate, ext: tryExtractTSExtension(candidate) as Extension } : undefined;
         }
 
         return loadModuleFromFileNoImplicitExtensions(extensions, candidate, onlyRecordFailures, state);