.eslintrc.json

{
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
        "warnOnUnsupportedTypeScriptVersion": false,
        "ecmaVersion": 6,
        "sourceType": "module"
    },
    "env": {
        "browser": false,
        "node": true,
        "es6": true
    },
    "plugins": [
        "@typescript-eslint/eslint-plugin",
        "no-null",
        "import",
        "prettier"
    ],
    "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/recommended",
        "plugin:prettier/recommended"
    ],
    "rules": {
        // eslint-plugin-import
        // deal with import/export package
        "import/no-extraneous-dependencies": ["error", { "optionalDependencies": false }],
        "@typescript-eslint/no-this-alias": ["off"],
        "@typescript-eslint/no-namespace": ["off"]

        // eslint-plugin-no-null
        // restricts using null as explicit values for variables or function arguments.
        // "no-null/no-null": "error"
    }
}