Nested this container (#36495)

* Add nestedThisContainer test

* Fix #36492

Author: brandonbloom

src/compiler/checker.ts

@@ -21144,7 +21144,7 @@ namespace ts {
                 }
                 // In an assignment of the form 'obj.xxx = function(...)' or 'obj[xxx] = function(...)', the
                 // contextual type for 'this' is 'obj'.
-                const parent = func.parent;
+                const parent = walkUpParenthesizedExpressions(func.parent);
                 if (parent.kind === SyntaxKind.BinaryExpression && (<BinaryExpression>parent).operatorToken.kind === SyntaxKind.EqualsToken) {
                     const target = (<BinaryExpression>parent).left;
                     if (isAccessExpression(target)) {

tests/baselines/reference/nestedThisContainer.js

@@ -0,0 +1,22 @@
+//// [nestedThisContainer.ts]
+type Foo = any;
+
+const foo: Foo = {};
+
+foo.bar = function () {
+    const self: Foo = this;
+};
+
+foo.zab = (function () {
+    const self: Foo = this;
+});
+
+
+//// [nestedThisContainer.js]
+var foo = {};
+foo.bar = function () {
+    var self = this;
+};
+foo.zab = (function () {
+    var self = this;
+});

tests/baselines/reference/nestedThisContainer.symbols

@@ -0,0 +1,26 @@
+=== tests/cases/compiler/nestedThisContainer.ts ===
+type Foo = any;
+>Foo : Symbol(Foo, Decl(nestedThisContainer.ts, 0, 0))
+
+const foo: Foo = {};
+>foo : Symbol(foo, Decl(nestedThisContainer.ts, 2, 5))
+>Foo : Symbol(Foo, Decl(nestedThisContainer.ts, 0, 0))
+
+foo.bar = function () {
+>foo : Symbol(foo, Decl(nestedThisContainer.ts, 2, 5))
+
+    const self: Foo = this;
+>self : Symbol(self, Decl(nestedThisContainer.ts, 5, 9))
+>Foo : Symbol(Foo, Decl(nestedThisContainer.ts, 0, 0))
+
+};
+
+foo.zab = (function () {
+>foo : Symbol(foo, Decl(nestedThisContainer.ts, 2, 5))
+
+    const self: Foo = this;
+>self : Symbol(self, Decl(nestedThisContainer.ts, 9, 9))
+>Foo : Symbol(Foo, Decl(nestedThisContainer.ts, 0, 0))
+
+});
+

tests/baselines/reference/nestedThisContainer.types

@@ -0,0 +1,35 @@
+=== tests/cases/compiler/nestedThisContainer.ts ===
+type Foo = any;
+>Foo : any
+
+const foo: Foo = {};
+>foo : any
+>{} : {}
+
+foo.bar = function () {
+>foo.bar = function () {    const self: Foo = this;} : () => void
+>foo.bar : any
+>foo : any
+>bar : any
+>function () {    const self: Foo = this;} : () => void
+
+    const self: Foo = this;
+>self : any
+>this : any
+
+};
+
+foo.zab = (function () {
+>foo.zab = (function () {    const self: Foo = this;}) : () => void
+>foo.zab : any
+>foo : any
+>zab : any
+>(function () {    const self: Foo = this;}) : () => void
+>function () {    const self: Foo = this;} : () => void
+
+    const self: Foo = this;
+>self : any
+>this : any
+
+});
+

tests/cases/compiler/nestedThisContainer.ts

@@ -0,0 +1,13 @@
+// @noImplicitThis:true
+
+type Foo = any;
+
+const foo: Foo = {};
+
+foo.bar = function () {
+    const self: Foo = this;
+};
+
+foo.zab = (function () {
+    const self: Foo = this;
+});