Merge pull request microsoft#30719 from andrewbranch/bug/30668

Fix crash when binding deep module.exports assignment

Author: andrewbranch

src/compiler/binder.ts

@@ -2710,8 +2710,7 @@ namespace ts {
             }
             else {
                 const s = forEachIdentifierInEntityName(e.expression, parent, action);
-                if (!s || !s.exports) return Debug.fail();
-                return action(e.name, s.exports.get(e.name.escapedText), s);
+                return action(e.name, s && s.exports && s.exports.get(e.name.escapedText), s);
             }
         }
 

tests/baselines/reference/jsFileCompilationBindDeepExportsAssignment.errors.txt

@@ -0,0 +1,8 @@
+tests/cases/compiler/a.js(1,9): error TS2339: Property 'a' does not exist on type 'typeof import("tests/cases/compiler/a")'.
+
+
+==== tests/cases/compiler/a.js (1 errors) ====
+    exports.a.b.c = 0;
+            ~
+!!! error TS2339: Property 'a' does not exist on type 'typeof import("tests/cases/compiler/a")'.
+    

tests/baselines/reference/jsFileCompilationBindDeepExportsAssignment.symbols

@@ -0,0 +1,4 @@
+=== tests/cases/compiler/a.js ===
+exports.a.b.c = 0;
+>exports : Symbol("tests/cases/compiler/a", Decl(a.js, 0, 0))
+

tests/baselines/reference/jsFileCompilationBindDeepExportsAssignment.types

@@ -0,0 +1,12 @@
+=== tests/cases/compiler/a.js ===
+exports.a.b.c = 0;
+>exports.a.b.c = 0 : 0
+>exports.a.b.c : any
+>exports.a.b : any
+>exports.a : any
+>exports : typeof import("tests/cases/compiler/a")
+>a : any
+>b : any
+>c : any
+>0 : 0
+

tests/cases/compiler/jsFileCompilationBindDeepExportsAssignment.ts

@@ -0,0 +1,6 @@
+// @allowJs: true
+// @noEmit: true
+// @checkJs: true
+// @filename: a.js
+
+exports.a.b.c = 0;