Transform class static block (#12143)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>
Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-plugin-proposal-class-static-block/test/plugin-ordering.test.js

@@ -0,0 +1,41 @@
+import * as babel from "@babel/core";
+import proposalClassStaticBlock from "../lib/index.js";
+
+describe("plugin ordering", () => {
+  it("should throw when @babel/plugin-proposal-class-static-block is after class features plugin", () => {
+    const source = `class Foo {
+  static {
+    this.foo = Foo.bar;
+  }
+  static bar = 42;
+}
+`;
+    expect(() => {
+      babel.transform(source, {
+        filename: "example.js",
+        highlightCode: false,
+        configFile: false,
+        babelrc: false,
+        plugins: [
+          "@babel/plugin-proposal-class-properties",
+          proposalClassStaticBlock,
+        ],
+      });
+    })
+      .toThrow(`Incorrect plugin order, \`@babel/plugin-proposal-class-static-block\` should be placed before class features plugins
+{
+  "plugins": [
+    "@babel/plugin-proposal-class-static-block",
+    "@babel/plugin-proposal-private-property-in-object",
+    "@babel/plugin-proposal-private-methods",
+    "@babel/plugin-proposal-class-properties",
+  ]
+}
+  1 | class Foo {
+> 2 |   static {
+    |   ^
+  3 |     this.foo = Foo.bar;
+  4 |   }
+  5 |   static bar = 42;`);
+  });
+});