Get jsdoc host from chained assignment (#36111)

* Get jsdoc host from chained assignment

getSourceOfAssignment previously only checked one level of binary
expression instead of following binary expressions all the way to the
right. This meant that binding of `@constructor` would fail in the
following example:

```js
/** @constructor */
a = b = function () { }
```

* cleanup lint

* use existing utility

Author: sandersn

src/compiler/utilities.ts

@@ -2318,9 +2318,9 @@ namespace ts {
 
     function getSourceOfAssignment(node: Node): Node | undefined {
         return isExpressionStatement(node) &&
-            node.expression && isBinaryExpression(node.expression) &&
+            isBinaryExpression(node.expression) &&
             node.expression.operatorToken.kind === SyntaxKind.EqualsToken
-            ? node.expression.right
+            ? getRightMostAssignedExpression(node.expression)
             : undefined;
     }
 

tests/baselines/reference/constructorTagOnNestedBinaryExpression.symbols

@@ -0,0 +1,14 @@
+=== tests/cases/conformance/jsdoc/constructorTagOnNestedBinaryExpression.js ===
+// Fixes #35021
+/** @constructor */
+a = b = function c () {
+>c : Symbol(c, Decl(constructorTagOnNestedBinaryExpression.js, 2, 7))
+
+    console.log(this)
+>console.log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
+>console : Symbol(console, Decl(lib.dom.d.ts, --, --))
+>log : Symbol(Console.log, Decl(lib.dom.d.ts, --, --))
+>this : Symbol(c, Decl(constructorTagOnNestedBinaryExpression.js, 2, 7))
+
+};
+

tests/baselines/reference/constructorTagOnNestedBinaryExpression.types

@@ -0,0 +1,20 @@
+=== tests/cases/conformance/jsdoc/constructorTagOnNestedBinaryExpression.js ===
+// Fixes #35021
+/** @constructor */
+a = b = function c () {
+>a = b = function c () {    console.log(this)} : typeof c
+>a : error
+>b = function c () {    console.log(this)} : typeof c
+>b : error
+>function c () {    console.log(this)} : typeof c
+>c : typeof c
+
+    console.log(this)
+>console.log(this) : void
+>console.log : (message?: any, ...optionalParams: any[]) => void
+>console : Console
+>log : (message?: any, ...optionalParams: any[]) => void
+>this : this
+
+};
+

tests/cases/conformance/jsdoc/constructorTagOnNestedBinaryExpression.ts

@@ -0,0 +1,8 @@
+// @allowjs: true
+// @noemit: true
+// @Filename: constructorTagOnNestedBinaryExpression.js
+// Fixes #35021
+/** @constructor */
+a = b = function c () {
+    console.log(this)
+};