JS: Add test

javascript/ql/test/library-tests/TypeScript/ExternalBaseTypes/BaseTypes.expected

@@ -0,0 +1,3 @@
+| B in module 'mylib' | A in module 'mylib' |
+| C in module 'mylib' | B in module 'mylib' |
+| D in module 'mylib' | C in module 'mylib' |

javascript/ql/test/library-tests/TypeScript/ExternalBaseTypes/BaseTypes.ql

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+import javascript
+
+from TypeName tn
+where tn.hasQualifiedName("mylib", _)
+select tn, tn.getABaseTypeName()

javascript/ql/test/library-tests/TypeScript/ExternalBaseTypes/node_modules/@types/mylib/index.d.ts

@@ -0,0 +1,4 @@
+export interface A {}
+export interface B extends A {}
+export interface C extends B {}
+export interface D extends C {}

javascript/ql/test/library-tests/TypeScript/ExternalBaseTypes/options

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+semmle-extractor-options:--exclude node_modules/**

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

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+{
+	"compilerOptions": {
+		"baseUrl": "./"
+	}
+}

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

@@ -0,0 +1,3 @@
+import { D } from "mylib";
+
+export var foo: D = null;