Merge pull request #17252 from Microsoft/contextually-type-this-in-object-literals-in-javascript

Contextually type this in object literals in JS

tests/cases/conformance/types/thisType/contextualThisTypeInJavascript.ts

@@ -0,0 +1,13 @@
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+// @Filename: context.js
+const obj = {
+    prop: 2,
+    method() {
+        this;
+        this.prop;
+        this.method;
+        this.unknown; // ok, obj has a string indexer
+    }
+}