From 4dcd48951290381cc23f29a7e5ba63de93d7d3a6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Fri, 26 Feb 2021 17:32:29 -0500
Subject: [PATCH] fix: add compatibility warning for older @babel/helper
 versions

---
 Makefile                                      |  1 +
 .../src/fields.js                             | 19 +++++++++++++++----
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 58f47e68022c..28a2bb056473 100644
--- a/Makefile
+++ b/Makefile
@@ -202,6 +202,7 @@ new-version:
 	@echo "!!!!!!   Update classStaticPrivateFieldDestructureSet    !!!!!!"
 	@echo "!!!!!!   helper version in                               !!!!!!"
 	@echo "!!!!!!   packages/babel-helpers/src/helpers.js           !!!!!!"
+	@echo "!!!!!!   packages/babel-helper-create-class-features-plugin/src/fields.js"
 	@echo "!!!!!!                                                   !!!!!!"
 	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
 	@echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
diff --git a/packages/babel-helper-create-class-features-plugin/src/fields.js b/packages/babel-helper-create-class-features-plugin/src/fields.js
index 5a09308b4ae5..f48b6ba74a47 100644
--- a/packages/babel-helper-create-class-features-plugin/src/fields.js
+++ b/packages/babel-helper-create-class-features-plugin/src/fields.js
@@ -315,11 +315,22 @@ const privateNameHandlerSpec = {
     const { name } = member.node.property.id;
     const { id, static: isStatic } = privateNamesMap.get(name);
     if (isStatic) {
+      try {
+        // classStaticPrivateFieldDestructureSet was introduced in 7.99.0
+        // eslint-disable-next-line no-var
+        var helper = file.addHelper("classStaticPrivateFieldDestructureSet");
+      } catch {
+        throw new Error(
+          "Babel can not transpile `[C.#p] = [0]` with @babel/helper < 7.99.0, \n" +
+            "please update @babel/helper to the latest version",
+        );
+      }
       return t.memberExpression(
-        t.callExpression(
-          file.addHelper("classStaticPrivateFieldDestructureSet"),
-          [this.receiver(member), t.cloneNode(classRef), t.cloneNode(id)],
-        ),
+        t.callExpression(helper, [
+          this.receiver(member),
+          t.cloneNode(classRef),
+          t.cloneNode(id),
+        ]),
         t.identifier("value"),
       );
     }