test eslint ecmaVersion for ts parser

.eslintrc.js

// eslint-disable-next-line no-undef
module.exports = {
  parser: "@typescript-eslint/parser",
  parserOptions: {
    ecmaVersion: 2015,
  },
  plugins: ["@typescript-eslint"],
  extends: ["plugin:@typescript-eslint/recommended"],
  rules: {
    "@typescript-eslint/no-explicit-any": "off",
  },
};

package.json

{
  "name": "test-eslint",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/plugin-proposal-decorators": "^7.25.9",
    "@typescript-eslint/eslint-plugin": "^8.30.1",
    "@typescript-eslint/parser": "^8.30.1",
    "eslint": "^8.0.0"
  }
}

test.ts

const tests: any = {};

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

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

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

tsconfig.json

{
  "compilerOptions": {
    // The target value affects
    // how the TS Language server parses the ts code.
    // Change it to ES2020 to enable parsing the "10n"
    // syntax, or es2022 to enable parsing the "/d" regex flag,
    // or es2024 to parse the "/v" regex flag
    "target": "ES2015"
  }
}