Probably works

weswigham · weswigham · commit bf03421f6f5a · 2022-03-28T16:51:48.000-07:00
diff --git 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);

Original file line number	Diff line number	Diff line change
`@@ -1498,9 +1498,9 @@ namespace ts {`
`1498`	`1498`	`}`
`1499`	`1499`
`1500`	`1500`	`function loadJSOrExactTSFileName(extensions: Extensions, candidate: string, onlyRecordFailures: boolean, state: ModuleResolutionState): PathAndExtension \| undefined {`
`1501`		`- if ((extensions === Extensions.TypeScript \|\| extensions === Extensions.DtsOnly) && fileExtensionIsOneOf(candidate, [Extension.Dts, Extension.Dcts, Extension.Dmts])) {`
	`1501`	`+ if ((extensions === Extensions.TypeScript \|\| extensions === Extensions.DtsOnly) && fileExtensionIsOneOf(candidate, supportedTSExtensionsFlat)) {`
`1502`	`1502`	`const result = tryFile(candidate, onlyRecordFailures, state);`
`1503`		`- return result !== undefined ? { path: candidate, ext: forEach([Extension.Dts, Extension.Dcts, Extension.Dmts], e => fileExtensionIs(candidate, e) ? e : undefined)! } : undefined;`
	`1503`	`+ return result !== undefined ? { path: candidate, ext: tryExtractTSExtension(candidate) as Extension } : undefined;`
`1504`	`1504`	`}`
`1505`	`1505`
`1506`	`1506`	`return loadModuleFromFileNoImplicitExtensions(extensions, candidate, onlyRecordFailures, state);`