Typescript-eslint: Optional chaining syntax is still not supported

[bosens-China]

What code were you trying to parse?

const a: { x: number; y: number; z?: number} = { x: 1, y: 2 };
const b = a?.z ?? 3;

console.log(b);

What did you expect to happen?
Get the right results, not the wrong ones

What actually happened?
Expression expected.
Expected ':'.

Versions

| package | version |
| --------------------------- | ------- |
| @typescript-eslint/parser| "^2.10.0"
| TypeScript |"^3.7.3",
| ESLint |"^6.7.2"
| node |v13.0.1
| npm | 6.13.0

config

• .eslintrc.js

module.exports = {
  root: true,
  extends: ["alloy", "alloy/typescript"],
  parser: "@typescript-eslint/parser",
  env: {
    // Your environments (which contains several predefined global variables)
    //
    browser: true,
    node: true,
    es2017: true,
    mocha: true
    // node: true,
    // mocha: true,
    // jest: true,
    // jquery: true
  },
  globals: {
    // Your global variables (setting to false means it's not allowed to be reassigned)
    //
    // myGlobal: false
  },
  rules: {
    'no-undef': 0
  }
};

• package.json

{
  "name": "page",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "devDependencies": {
    "@babel/core": "^7.7.4",
    "@babel/plugin-proposal-class-properties": "^7.7.4",
    "@babel/plugin-proposal-optional-chaining": "^7.7.4",
    "@babel/preset-env": "^7.7.4",
    "@typescript-eslint/eslint-plugin": "^2.10.0",
    "@typescript-eslint/parser": "^2.10.0",
    "autoprefixer": "^9.7.3",
    "babel-eslint": "^10.0.3",
    "babel-loader": "^8.0.6",
    "clean-webpack-plugin": "^3.0.0",
    "core-js": "^3.4.7",
    "css-loader": "^3.2.0",
    "ejs-loader": "^0.3.5",
    "eslint": "^6.7.2",
    "eslint-config-alloy": "^3.4.0",
    "eslint-loader": "^3.0.2",
    "extract-loader": "^3.1.0",
    "file-loader": "^5.0.2",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "mini-css-extract-plugin": "^0.8.0",
    "node-sass": "^4.13.0",
    "postcss-loader": "^3.0.0",
    "sass-loader": "^8.0.0",
    "style-loader": "^1.0.1",
    "ts-loader": "^6.2.1",
    "typescript": "^3.7.3",
    "uglifyjs-webpack-plugin": "^2.2.0",
    "url-loader": "^3.0.0",
    "webpack": "^4.41.2",
    "webpack-cli": "^3.3.10",
    "webpack-dev-server": "^3.9.0",
    "webpack-merge": "^4.2.2"
  },
  "scripts": {
    "serve": "cross-env NODE_ENV=development webpack-dev-server --config build/webpack.config.js",
    "build": "cross-env NODE_ENV=production webpack --config build/webpack.config.js"
  },
  "dependencies": {
    "cross-env": "^6.0.3"
  }
}

[bradzacher]

It's supported fine, and has been supported since before its release.
There are passing tests, and there are millions of other users that this is working fine for.

If I were to hazard a guess, the configs you're extending are using the wrong versions of packages like prettier, our packages, or typescript.

Please ensure that all of your packages are up to date.