`1` for `warnings` and `2` for `errors` & "rules": { "semi": [2, "always"] }

eslint-1-warnings-2-errors.md

1 for warnings and 2 for errors

http://eslint.org/docs/developer-guide/working-with-custom-formatters#the-message-object

"semi": 2

{
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "rules": {
        "semi": 2
    }
}

http://eslint.org/docs/user-guide/configuring

http://eslint.org/docs/rules/no-compare-neg-zero

"semi": [2, "always"]

1 for warnings and 2 for errors & "rules": { "semi": [2, "always"] }