From 15554d7ea5cd7fa200a77bb92e0da0f1cf6d324f Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Fri, 9 Feb 2018 16:20:11 -0800
Subject: [PATCH] Fix bogus jsdoc error

---
 src/compiler/utilities.ts | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index 80266cd78f6..a07040eb4ad 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -1682,6 +1682,15 @@ namespace ts {
             node.expression.right;
     }
 
+    function getSourceOfDefaultedAssignment(node: Node): Node {
+        return isExpressionStatement(node) &&
+            isBinaryExpression(node.expression) &&
+            getSpecialPropertyAssignmentKind(node.expression) !== SpecialPropertyAssignmentKind.None &&
+            isBinaryExpression(node.expression.right) &&
+            node.expression.right.operatorToken.kind === SyntaxKind.BarBarToken &&
+            node.expression.right.right;
+    }
+
     function getSingleInitializerOfVariableStatement(node: Node, child?: Node): Node {
         return isVariableStatement(node) &&
             node.declarationList.declarations.length > 0 &&
@@ -1723,7 +1732,8 @@ namespace ts {
                 (getSingleVariableOfVariableStatement(parent.parent, node) || getSourceOfAssignment(parent.parent))) {
                 getJSDocCommentsAndTagsWorker(parent.parent);
             }
-            if (parent && parent.parent && parent.parent.parent && getSingleInitializerOfVariableStatement(parent.parent.parent, node)) {
+            if (parent && parent.parent && parent.parent.parent &&
+                (getSingleInitializerOfVariableStatement(parent.parent.parent, node) || getSourceOfDefaultedAssignment(parent.parent.parent))) {
                 getJSDocCommentsAndTagsWorker(parent.parent.parent);
             }
             if (isBinaryExpression(node) && getSpecialPropertyAssignmentKind(node) !== SpecialPropertyAssignmentKind.None ||
@@ -1765,7 +1775,8 @@ namespace ts {
 
     export function getHostSignatureFromJSDoc(node: JSDocParameterTag): FunctionLike | undefined {
         const host = getJSDocHost(node);
-        const decl = getSourceOfAssignment(host) ||
+        const decl = getSourceOfDefaultedAssignment(host) ||
+            getSourceOfAssignment(host) ||
             getSingleInitializerOfVariableStatement(host) ||
             getSingleVariableOfVariableStatement(host) ||
             getNestedModuleDeclaration(host) ||