.eslintrc.json

{
  "root": true,
  "env": {
    "commonjs": true,
    "es6": true,
    "node": true,
    "jest": true
  },
  "globals": {
    "Atomics": "readonly",
    "SharedArrayBuffer": "readonly"
  },
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "requireConfigFile": false,
    "babelOptions": {
      "presets": [
        "@babel/preset-react",
        [
          "@babel/preset-env",
          {
            "targets": {
              "node": "10"
            }
          }
        ]
      ],
      "plugins": ["@babel/plugin-proposal-class-properties"]
    }
  },
  "plugins": ["@babel", "react"],
  "extends": "eslint:recommended",
  "rules": {
    "react/jsx-uses-react": "error",
    "react/jsx-uses-vars": "error"
  },
  "overrides": [
    {
      "files": ["**/*.ts", "**/*.tsx"],
      "env": { "browser": true, "es6": true, "node": true },
      "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/recommended"
      ],
      "globals": { "Atomics": "readonly", "SharedArrayBuffer": "readonly" },
      "parser": "@typescript-eslint/parser",
      "plugins": ["@typescript-eslint"],
      "rules": {
        "@typescript-eslint/explicit-module-boundary-types": "off",
        "@typescript-eslint/no-non-null-assertion": "off",
        "@typescript-eslint/no-explicit-any": "off"
      }
    }
  ]
}