autoimports nil dereference crash fix (#1665)

Co-authored-by: Copilot <[email protected]>

Author: iisaduan

internal/fourslash/_scripts/failingTests.txt

@@ -167,7 +167,6 @@ TestDoubleUnderscoreCompletions
 TestEditJsdocType
 TestExportDefaultClass
 TestExportDefaultFunction
-TestExportEqualNamespaceClassESModuleInterop
 TestFindAllReferencesDynamicImport1
 TestFindAllReferencesTripleSlash
 TestFindAllReferencesUmdModuleAsGlobalConst

internal/fourslash/tests/gen/exportEqualNamespaceClassESModuleInterop_test.go

@@ -10,7 +10,7 @@ import (
 
 func TestExportEqualNamespaceClassESModuleInterop(t *testing.T) {
 	t.Parallel()
-	t.Skip()
+
 	defer testutil.RecoverAndFail(t, "Panic on fourslash test")
 	const content = `// @esModuleInterop: true
 // @moduleResolution: node

internal/ls/autoimports.go

@@ -859,13 +859,14 @@ func tryUseExistingNamespaceImport(existingImports []*FixAddToExistingImportInfo
 		declaration := existingImport.declaration
 		switch declaration.Kind {
 		case ast.KindVariableDeclaration, ast.KindImportEqualsDeclaration:
-			if declaration.Kind == ast.KindVariableDeclaration && declaration.Name().Kind != ast.KindIdentifier {
+			name := declaration.Name()
+			if declaration.Kind == ast.KindVariableDeclaration && (name == nil || name.Kind != ast.KindIdentifier) {
 				continue
 			}
-			namespacePrefix = declaration.Name().Text()
+			namespacePrefix = name.Text()
 		case ast.KindJSDocImportTag, ast.KindImportDeclaration:
 			importClause := ast.GetImportClauseOfDeclaration(declaration)
-			if importClause == nil || importClause.NamedBindings.Kind != ast.KindNamespaceImport {
+			if importClause == nil || importClause.NamedBindings == nil || importClause.NamedBindings.Kind != ast.KindNamespaceImport {
 				continue
 			}
 			namespacePrefix = importClause.NamedBindings.Name().Text()