TS: Add regression test

javascript/ql/test/library-tests/TypeScript/RegressionTests/ImportSelf/bar.ts

@@ -0,0 +1,3 @@
+import { A } from "@blah/foo";
+
+var x: A;

javascript/ql/test/library-tests/TypeScript/RegressionTests/ImportSelf/node_modules/@blah/foo/index.d.ts

@@ -0,0 +1,8 @@
+import FooArray, { A } from '@blah/foo';
+
+namespace FooArray {
+  function blah(): void;
+}
+
+export default FooArray;
+export { A };

javascript/ql/test/library-tests/TypeScript/RegressionTests/ImportSelf/test.ql

@@ -0,0 +1,3 @@
+import javascript
+
+from Expr e select e, e.getType()

javascript/ql/test/library-tests/TypeScript/RegressionTests/ImportSelf/tsconfig.json

@@ -0,0 +1,3 @@
+{
+    "include": ["."]
+}