From 9795fa6631650b93320bbc64b1bb3902fd758093 Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Thu, 30 Apr 2020 09:52:09 -0700
Subject: [PATCH] Improve assert message in binder

Looking at the code, I don't think the assert can ever fire, but it
clearly does, or did in the past. This will make it easier for people to
create a repro.
---
 src/compiler/binder.ts | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index 3ea8df0a839..72516cc0739 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -2977,15 +2977,15 @@ namespace ts {
                 //    util.property = function ...
                 bindExportsPropertyAssignment(node as BindableStaticPropertyAssignmentExpression);
             }
+            else if (hasDynamicName(node)) {
+                bindAnonymousDeclaration(node, SymbolFlags.Property | SymbolFlags.Assignment, InternalSymbolName.Computed);
+                const sym = bindPotentiallyMissingNamespaces(parentSymbol, node.left.expression, isTopLevelNamespaceAssignment(node.left), /*isPrototype*/ false, /*containerIsClass*/ false);
+                addLateBoundAssignmentDeclarationToSymbol(node, sym);
+            }
             else {
-                if (hasDynamicName(node)) {
-                    bindAnonymousDeclaration(node, SymbolFlags.Property | SymbolFlags.Assignment, InternalSymbolName.Computed);
-                    const sym = bindPotentiallyMissingNamespaces(parentSymbol, node.left.expression, isTopLevelNamespaceAssignment(node.left), /*isPrototype*/ false, /*containerIsClass*/ false);
-                    addLateBoundAssignmentDeclarationToSymbol(node, sym);
-                }
-                else {
-                    bindStaticPropertyAssignment(cast(node.left, isBindableStaticAccessExpression));
-                }
+                if (!isBindableStaticAccessExpression(node.left))
+                    return Debug.fail(`Invalid cast. The supplied value ${getTextOfNode(node.left)} was not a BindableStaticAccessExpression.`);
+                bindStaticPropertyAssignment(node.left as BindableStaticAccessExpression);
             }
         }