Rollforward: Fix ClosureRewriteModule crash on unrecognized goog.requireDynamic

PiperOrigin-RevId: 618246611

Author: lauraharker

src/com/google/javascript/jscomp/ClosureRewriteModule.java

@@ -1222,6 +1222,11 @@ private void updateGoogForwardDeclare(NodeTraversal t, Node call) {
 
   private void updateGoogRequireDynamicCall(Node call) {
     final Node parent = call.getParent();
+    if (parent == null) {
+      // This call has been detached from the AST in unrecognized require handling. Nothing else to
+      // do here.
+      return;
+    }
     checkState(
         parent.isAwait() || (parent.isGetProp() && parent.getString().equals("then")),
         "goog.requireDynamic() in only allowed in await/then expression");

test/com/google/javascript/jscomp/ClosureRewriteModuleTest.java

@@ -1282,6 +1282,45 @@ public void testGoogRequireDynamic_then_name() {
                 "}")));
   }
 
+  @Test
+  public void testGoogRequireDynamic_then_name_laterLoadedModule() {
+    test(
+        srcs(
+            lines(
+                "async function test() {", //
+                "  goog.requireDynamic('a.b.c').then((foo) => {console.log(foo.Foo);});",
+                "}"),
+            lines("goog.module('a.b.c');", "exports.Foo=class{}")),
+        expected(
+            lines(
+                "async function test() {", //
+                "  goog.importHandler_('sG5M4c').then(() => { ",
+                "     const foo = module$exports$a$b$c;",
+                "     console.log(foo.Foo);",
+                "  });",
+                "}"),
+            lines(
+                "/** @const */ var module$exports$a$b$c = {};",
+                "/** @const */ module$exports$a$b$c.Foo = class {}")));
+  }
+
+  @Test
+  public void testGoogRequireDynamic_then_missingSources() {
+    test(
+        srcs(
+            lines(
+                "async function test() {", //
+                "  /** @suppress {missingSourcesWarnings} */",
+                "  goog.requireDynamic('a.b.c').then((foo) => {console.log(foo.Foo);});",
+                "}")),
+        expected(
+            lines(
+                "async function test() {", //
+                "  /** @suppress {missingSourcesWarnings} */",
+                "  null.then((foo) => {console.log(foo.Foo);});",
+                "}")));
+  }
+
   @Test
   public void testRequireDynamic_illegal_await_lhs() {
     testError(