fix(50866): emit modifiers from export declarations (#50874)

Author: a-tarasyuk

src/compiler/emitter.ts

@@ -3491,6 +3491,7 @@ namespace ts {
         }
 
         function emitExportDeclaration(node: ExportDeclaration) {
+            emitModifiers(node, node.modifiers);
             let nextPos = emitTokenWithComment(SyntaxKind.ExportKeyword, node.pos, writeKeyword, node);
             writeSpace();
             if (node.isTypeOnly) {

tests/cases/fourslash/organizeImports12.ts

@@ -0,0 +1,13 @@
+/// <reference path="fourslash.ts" />
+
+// @allowJs: true
+// @Filename: /test.js
+////declare export default class A {}
+////declare export { a, b };
+////declare export * from "foo";
+
+verify.organizeImports(
+`declare export default class A {}
+declare export * from "foo";
+declare export { a, b };
+`);