TS: Pass tsconfig options correctly

javascript/extractor/lib/typescript/src/main.ts

@@ -253,7 +253,7 @@ function handleOpenProjectCommand(command: OpenProjectCommand) {
         fileExists: (path: string) => fs.existsSync(path),
         readFile: ts.sys.readFile,
     };
-    let config = ts.parseJsonConfigFileContent(tsConfig, parseConfigHost, basePath);
+    let config = ts.parseJsonConfigFileContent(tsConfig.config, parseConfigHost, basePath);
     let project = new Project(tsConfigFilename, config, state.typeTable);
     project.load();
 

javascript/ql/test/library-tests/TypeScript/Nullability/Types.expected

@@ -0,0 +1,9 @@
+exprType
+| tst.ts:1:5:1:16 | stringOrNUll | string \| null |
+| tst.ts:2:5:2:21 | stringOrUndefined | string \| undefined |
+| tst.ts:3:5:3:27 | stringO ... defined | string \| null \| undefined |
+| tst.ts:4:5:4:16 | stringOrVoid | string \| void |
+| tst.ts:7:5:7:21 | stringOrNullAlias | string \| null |
+| tst.ts:8:5:8:32 | stringO ... defined | string \| null \| undefined |
+| tst.ts:10:5:10:23 | arrayOfStringOrNull | (string \| null)[] |
+unaliasedType

javascript/ql/test/library-tests/TypeScript/Nullability/Types.ql

@@ -0,0 +1,5 @@
+import javascript
+
+query Type exprType(Expr e) { result = e.getType() }
+
+query Type unaliasedType(TypeAliasReference ref) { result = ref.getAliasedType() }

javascript/ql/test/library-tests/TypeScript/Nullability/tsconfig.json

@@ -0,0 +1,6 @@
+{
+    "include": ["."],
+    "compilerOptions": {
+        "strict": true
+    }
+}

javascript/ql/test/library-tests/TypeScript/Nullability/tst.ts

@@ -0,0 +1,10 @@
+let stringOrNUll: string | null;
+let stringOrUndefined: string | undefined;
+let stringOrNullOrUndefined: string | null | undefined;
+let stringOrVoid: string | void;
+
+type StringOrNullAlias = string | null;
+let stringOrNullAlias: StringOrNullAlias;
+let stringOrNullAliasOrUndefined: StringOrNullAlias | undefined;
+
+let arrayOfStringOrNull: Array<string | null>;