.eslintrc.json

{
    "env": {
        "browser": true,
        "es2021": true
    },
    "extends": [
        "eslint:recommended",
        "plugin:@typescript-eslint/eslint-recommended",
        "plugin:@typescript-eslint/recommended"
    ],
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
        "ecmaVersion": "latest",
        "sourceType": "module"
    },
    "plugins": [
        "@typescript-eslint",
        "typescript-sort-keys"
    ],
    "rules": {
        // disable eslint rules in favor of TS version
        "indent": "off",
        "default-param-last": "off",

        // TS rules
        "@typescript-eslint/ban-ts-comment": "error",
        "@typescript-eslint/ban-tslint-comment": "error",
        "@typescript-eslint/ban-types": "error",
        "@typescript-eslint/default-param-last": "error",
        "@typescript-eslint/explicit-function-return-type": "error",
        "@typescript-eslint/explicit-member-accessibility": "error",
        "@typescript-eslint/explicit-module-boundary-types": "error",
        "@typescript-eslint/indent": ["error"],
        "@typescript-eslint/member-delimiter-style":[
            "warn",
            {
                "multiline": {
                    "delimiter": "semi",
                    "requireLast": true
                },
                "singleline": {
                    "delimiter": "semi",
                    "requireLast": true
                }
            }
        ],
        "@typescript-eslint/no-unused-vars": [
            "warn", // or error
            {
                "argsIgnorePattern": "^_$",
                "varsIgnorePattern": "^_$",
                "caughtErrorsIgnorePattern": "^_$"
            }
        ],
        "@typescript-eslint/type-annotation-spacing":[
            "warn",
            {
                "before": false,
                "after": true,
                "overrides": {
                    "arrow": {
                        "before": true,
                        "after": true
                    },
                    "variable": {
                        "before": false,
                        "after": false
                    }
                }
            }
        ],

        // sort-keys plugin
        "typescript-sort-keys/interface": "warn",
        "typescript-sort-keys/string-enum": "warn",

        // JS rules
        // deletes spaces in Array around brackets
        "array-bracket-spacing": [
            "warn",
            "never"
        ],
        // adds spaces between arrow in arrow function
        "arrow-spacing": [
            "warn",
            {
                "before": true,
                "after": true
            }
        ],
        // prevent reading variable which is not reachable by current scope
        "block-scoped-var": "error",
        // adds space around brackets in a block
        "block-spacing": [
            "warn",
            "always"
        ],
        /**
         * If else statement formatting
         * ```js
         * if (a === "true") {
         *  //...
         * }else {
         *  //...
         * }
         * //Will be transformed into:
         * if (a===true) {
         *  //...
         * }
         * else {
         *  //...
         * }
         * ```
         */
         "brace-style": [
            "warn",
            "stroustrup"
        ],
        "comma-spacing": [
            "warn",
            {
                "before": false,
                "after": true
            }
        ],
        "comma-style": [
            "warn",
            "last"
        ],
        "computed-property-spacing": [
            "warn",
            "never"
        ],
        // rewrites shortened version of block element like if statement to correct one
        "curly": "warn",
        "eol-last": "warn",
        "linebreak-style": [
            "warn",
            "unix"
        ],
        "lines-between-class-members": "warn",
        "keyword-spacing": "warn",
        // disable eval
        "no-eval": "error",
        // rewrites decimal number in format `.1` to `0.1`
        "no-floating-decimal": "warn",
        "no-multiple-empty-lines": "warn",
        "no-trailing-spaces": "warn",
        "no-whitespace-before-property": "warn",
        // adds empty line before and after any block statement
        "padding-line-between-statements": [
            "warn",
            {
                "blankLine": "always",
                "prev": "*",
                "next": [
                    "block-like",
                    "return"
                ]
            },
            {
                "blankLine": "always",
                "prev": "block-like",
                "next": "*"
            }
        ],
        "quotes": [
            "warn",
            "double"
        ],
         // forces to write semi everywhere
         "semi": [
            "warn",
            "always"
        ],
        "semi-spacing": [
            "warn",
            {
                "before": false,
                "after": true
            }
        ],
        "space-before-blocks": [
            "warn",
            {
                "functions": "always",
                "keywords": "always",
                "classes": "always"
            }
        ],
        "space-in-parens": [
            "warn",
            "never"
        ],
        "space-infix-ops": "warn",
        "spaced-comment": [
            "warn",
            "always",
            {
                "line": {
                    "markers": [
                        "/"
                    ],
                    "exceptions": [
                        "-",
                        "+"
                    ]
                },
                "block": {
                    "markers": [
                        "!"
                    ],
                    "exceptions": [
                        "*"
                    ],
                    "balanced": true
                }
            }
        ]
    }
}