.eslintrc.js

module.exports = {
    root: true,
    extends: ["eslint:recommended"],
    env: {
        browser: true,
        es2020: true,
    },
    overrides: [
        {
            files: ["**/*.ts"],
            plugins: ["@typescript-eslint"],
            extends: [
                "eslint:recommended",
                "plugin:@typescript-eslint/recommended",
            ],
            parser: "@typescript-eslint/parser",
            parserOptions: {
                project: ["./tsconfig.json"],
            },
            rules: {
                "@typescript-eslint/typedef": [
                    "error",
                    {
                        arrayDestructuring: true,
                        arrowParameter: true,
                        memberVariableDeclaration: true,
                        objectDestructuring: true,
                        parameter: true,
                        propertyDeclaration: true,
                        variableDeclaration: false,
                        variableDeclarationIgnoreFunction: true,
                    },
                ],
                "@typescript-eslint/explicit-function-return-type": "error",
            },
        },
    ],
    rules: {
        indent: ["warn", 4, { SwitchCase: 1 }],
        semi: ["error", "always"],
        quotes: [
            "error",
            "double",
            {
                avoidEscape: true,
            },
        ],
        eqeqeq: ["error", "always"],
        "no-var": "error",
    },
};