TS: Add regression test

Author: asger-semmle

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

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

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+{
+    "include": ["."]
+}