Enable classPrivateMethods in ReactJS

gistfile1.txt

First, Install this

npm i eslint @babel/core @babel/eslint-parser @babel/preset-env -D

Second, Create a .babelrc file
{
    "presets": [
      ["@babel/preset-env",
      {
        "shippedProposals": true
      }]
    ]
}

Thrid create a .eslintrc file 
{
    "env": {
        "browser": true,
        "es2021": true,
        "node": true
    },
    "extends": "eslint:recommended",
    "parser": "@babel/eslint-parser",
    "parserOptions": {
        "ecmaVersion": 12,
        "sourceType": "module"
    },
    "rules": {
    }
}