repl: add new language features to top level await statements

This adds stage-3 language features to acorn so that it's possible
to parse these features when using top level await in the REPL.

PR-URL: https://github.com/nodejs/node/pull/27400
Refs: https://github.com/nodejs/node/issues/27391
Refs: https://github.com/nodejs/node/issues/25835
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

lib/internal/repl/await.js

@@ -4,6 +4,23 @@ const { Object } = primordials;
 
 const acorn = require('internal/deps/acorn/acorn/dist/acorn');
 const walk = require('internal/deps/acorn/acorn-walk/dist/walk');
+const privateMethods =
+  require('internal/deps/acorn-plugins/acorn-private-methods/index');
+const bigInt = require('internal/deps/acorn-plugins/acorn-bigint/index');
+const classFields =
+  require('internal/deps/acorn-plugins/acorn-class-fields/index');
+const numericSeparator =
+  require('internal/deps/acorn-plugins/acorn-numeric-separator/index');
+const staticClassFeatures =
+  require('internal/deps/acorn-plugins/acorn-static-class-features/index');
+
+const parser = acorn.Parser.extend(
+  privateMethods,
+  bigInt,
+  classFields,
+  numericSeparator,
+  staticClassFeatures
+);
 
 const noop = () => {};
 const visitorsWithoutAncestors = {
@@ -76,7 +93,7 @@ function processTopLevelAwait(src) {
   const wrappedArray = wrapped.split('');
   let root;
   try {
-    root = acorn.parse(wrapped, { ecmaVersion: 10 });
+    root = parser.parse(wrapped, { ecmaVersion: 10 });
   } catch {
     return null;
   }