ESLint strict config

.eslintrc.json

{
    "parserOptions": {
        "ecmaVersion": 2017,
        "sourceType": "script",
        "ecmaFeatures": {
            "impliedStrict": true
        }
    },
    "env": {
        "node": true,
        "mocha": true,
        "mongo": true
    },
    "rules": {
        "array-bracket-spacing": ["warn", "never"],
        "array-callback-return": "error",
        "arrow-body-style": ["warn", "as-needed"],
        "arrow-spacing": "warn",
        "block-scoped-var": "error",
        "block-spacing": "warn",
        "class-methods-use-this": "warn",
        "comma-dangle": ["warn", "always-multiline"],
        "comma-spacing": ["warn", { "before": false, "after": true }],
        "constructor-super": "warn",
        "curly": ["warn", "multi-line"],
        "eqeqeq": "warn",
        "for-direction": "warn",
        "getter-return": "warn",
        "global-require": "warn",
        "handle-callback-err": "warn",
        "key-spacing": ["warn", { "beforeColon": false, "afterColon": true }],
        "multiline-ternary": ["warn", "always-multiline"],
        "no-alert": "warn",
        "no-await-in-loop": "warn",
        "no-caller": "error",
        "no-case-declarations": "error",
        "no-class-assign": "error",
        "no-cond-assign": "error",
        "no-console": "warn",
        "no-const-assign": "error",
        "no-constant-condition": "warn",
        "no-debugger": "warn",
        "no-dupe-args": "error",
        "no-dupe-class-members": "error",
        "no-dupe-keys": "error",
        "no-duplicate-case": "error",
        "no-duplicate-imports": "warn",
        "no-else-return": "warn",
        "no-empty-function": "warn",
        "no-empty-pattern": "warn",
        "no-empty": "warn",
        "no-eval": "error",
        "no-extra-bind": "warn",
        "no-extra-boolean-cast": "warn",
        "no-extra-semi": "error",
        "no-fallthrough": "warn",
        "no-floating-decimal": "error",
        "no-func-assign": "error",
        "no-implicit-globals": "warn",
        "no-implied-eval": "error",
        "no-inner-declarations": "warn",
        "no-invalid-regexp": "error",
        "no-lone-blocks": "warn",
        "no-lonely-if": "warn",
        "no-loop-func": "warn",
        "no-multi-assign": "warn",
        "no-multi-spaces": "warn",
        "no-nested-ternary": "warn",
        "no-obj-calls": "warn",
        "no-octal-escape": "error",
        "no-octal": "error",
        "no-param-reassign": ["warn", { "props": false }],
        "no-path-concat": "warn",
        "no-redeclare": "error",
        "no-return-assign": "warn",
        "no-return-await": "warn",
        "no-self-assign": "error",
        "no-self-compare": "warn",
        "no-sync": "warn",
        "no-template-curly-in-string": "warn",
        "no-this-before-super": "warn",
        "no-trailing-spaces": "warn",
        "no-undef-init": "warn",
        "no-undef": "error",
        "no-undefined": "error",
        "no-unexpected-multiline": "warn",
        "no-unneeded-ternary": "warn",
        "no-unreachable": "error",
        "no-unsafe-negation": "warn",
        "no-unused-expressions": "warn",
        "no-unused-vars": "warn",
        "no-useless-call": "warn",
        "no-useless-computed-key": "warn",
        "no-useless-constructor": "warn",
        "no-useless-escape": "warn",
        "no-useless-rename": "warn",
        "no-useless-return": "warn",
        "no-var": "warn",
        "no-with": "error",
        "object-property-newline": "warn",
        "prefer-arrow-callback": "warn",
        "prefer-const": "warn",
        "prefer-rest-params": "warn",
        "prefer-spread": "warn",
        "prefer-template": "warn",
        "quotes": ["warn", "single", { "allowTemplateLiterals": true }],
        "require-await": "warn",
        "require-yield": "error",
        "rest-spread-spacing": ["warn", "never"],
        "semi-spacing": ["error", { "before": false, "after": true }],
        "semi": ["warn", "always"],
        "space-before-blocks": "warn",
        "space-before-function-paren": ["warn", { "anonymous": "always", "named": "never", "asyncArrow": "always" }],
        "template-curly-spacing": ["warn", "never"],
        "template-tag-spacing": ["warn", "never"],
        "use-isnan": "error",
        "vars-on-top": "warn"
    }
}