let tests = {};

tests.objspread = { ...{} }; // es2018
tests.bign_syntaxt = 10n; // es2020
let undef;
tests.nullish = undef ?? "foo"; // es2020
tests.logical_assign ??= true; // es2021
tests.regexp_indices = /foo/dg; // es2022
tests.regexp_unicode = /foo/v; // es2024

// class annotation below requires:
//   parser: @babel/eslint-parser
//   with babelOptions:
//     plugins: [["@babel/plugin-proposal-decorators", { version: "2023-11" }]],

// @annotation
// // eslint-disable-next-line no-unused-vars
// class MyClass {}

// function annotation(target) {
//   target.annotated = true;
// }