(fix) import completion in upper case directory (#915)

Fix case sensitivity config
#881

Author: jasonlyu123

packages/language-server/src/plugins/typescript/service.ts

@@ -107,8 +107,7 @@ export function createLanguageService(
         resolveModuleNames: svelteModuleLoader.resolveModuleNames,
         readDirectory: svelteModuleLoader.readDirectory,
         getDirectories: ts.sys.getDirectories,
-        // vscode's uri is all lowercase
-        useCaseSensitiveFileNames: () => false,
+        useCaseSensitiveFileNames: () => ts.sys.useCaseSensitiveFileNames,
         getScriptKind: (fileName: string) => getSnapshot(fileName).scriptKind
     };
     let languageService = ts.createLanguageService(host);

packages/language-server/test/plugins/typescript/features/CompletionProvider.test.ts

@@ -340,6 +340,21 @@ describe('CompletionProviderImpl', () => {
         }
     });
 
+    it('provides import completions in file with uppercase directory', async () => {
+        const { completionProvider, document } = setup('UpperCase/dirCasing.svelte');
+
+        const completions = await completionProvider.getCompletions(
+            document,
+            Position.create(1, 22),
+            {
+                triggerKind: CompletionTriggerKind.TriggerCharacter,
+                triggerCharacter: '/'
+            }
+        );
+
+        assert.equal(completions?.items[0].label, 'toImport.ts');
+    });
+
     it('provides import completions for supported files', async () => {
         const sourceFile = 'importcompletions.svelte';
         const { completionProvider, document } = setup(sourceFile);

packages/language-server/test/plugins/typescript/testfiles/completions/UpperCase/dirCasing.svelte

@@ -0,0 +1,3 @@
+<script>
+    import {} from './'
+</script>