From 7b2bdaecd7e7396a720e165989d5cb3e752d23d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicol=C3=B2=20Ribaudo?= <nicolo.ribaudo@gmail.com>
Date: Wed, 17 Nov 2021 00:13:21 +0100
Subject: [PATCH] Fix tests on Node.js 12

---
 .../babel-eslint-tests/test/helpers/verifyAndAssertMessages.js  | 2 +-
 packages/babel-cli/test/index.js                                | 2 +-
 packages/babel-core/test/config-chain.js                        | 2 +-
 packages/babel-parser/test/helpers/runFixtureTests.js           | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/eslint/babel-eslint-tests/test/helpers/verifyAndAssertMessages.js b/eslint/babel-eslint-tests/test/helpers/verifyAndAssertMessages.js
index 6829c73bbbd6..4fab9a573330 100644
--- a/eslint/babel-eslint-tests/test/helpers/verifyAndAssertMessages.js
+++ b/eslint/babel-eslint-tests/test/helpers/verifyAndAssertMessages.js
@@ -31,7 +31,7 @@ export default function verifyAndAssertMessages(
           "../../../babel-eslint-shared-fixtures/config/babel.config.js",
         ),
       },
-      ...overrideConfig?.parserOptions,
+      ...(overrideConfig && overrideConfig.parserOptions),
     },
   });
 
diff --git a/packages/babel-cli/test/index.js b/packages/babel-cli/test/index.js
index 85395b30a169..2de08e866d00 100644
--- a/packages/babel-cli/test/index.js
+++ b/packages/babel-cli/test/index.js
@@ -123,7 +123,7 @@ const assertTest = function (stdout, stderr, opts, cwd) {
           const expected = opts.outFiles[filename];
           const actual = actualFiles[filename];
 
-          expect(actual).toBe(expected ?? "");
+          expect(actual).toBe(expected || "");
         }
       } catch (e) {
         e.message += "\n at " + filename;
diff --git a/packages/babel-core/test/config-chain.js b/packages/babel-core/test/config-chain.js
index e8a7d967062a..01961fa7e110 100644
--- a/packages/babel-core/test/config-chain.js
+++ b/packages/babel-core/test/config-chain.js
@@ -14,7 +14,7 @@ import { isMJS, loadOptionsAsync, skipUnsupportedESM } from "./helpers/esm.js";
 // TODO: In Babel 8, we can directly uses fs.promises which is supported by
 // node 8+
 const pfs =
-  fs.promises ??
+  fs.promises ||
   new Proxy(fs, {
     get(target, name) {
       if (name === "copyFile") {
diff --git a/packages/babel-parser/test/helpers/runFixtureTests.js b/packages/babel-parser/test/helpers/runFixtureTests.js
index 0aaf0858d6b6..7388a01d836c 100644
--- a/packages/babel-parser/test/helpers/runFixtureTests.js
+++ b/packages/babel-parser/test/helpers/runFixtureTests.js
@@ -218,7 +218,7 @@ function runTest(test, parseFunction, compareErrorsOnly = false) {
       return save(test, ast);
     }
 
-    if (ast.errors?.length) {
+    if (ast.errors && ast.errors.length) {
       throw new Error(
         `Expected non-recoverable error message: ${
           opts.throws