.eslintrc.js

module.exports = {
    'env': {
        'browser': true,
        'node': true
    },
    'globals': {
        'L': true
    },
    'rules': {
        'quotes': [2, 'single'],
        'indent': ['error', 4],
        'no-multi-spaces': [2],
        'no-unused-vars': [1],
        'no-mixed-spaces-and-tabs': [2],
        'no-underscore-dangle': [2],
        'no-loop-func': [2],
        'handle-callback-err': [2],
        'consistent-return': [2],
        'space-unary-ops': [2],
        'space-in-parens': ['error', 'never'],
        'space-before-function-paren': ['error', 'never'],
        'no-trailing-spaces': [2],
        'no-tabs': [2],
        'new-cap': [2],
        'no-shadow': [2],
        'camelcase': [2],
        'curly': [2],
        'block-spacing': ['error', 'always'],
        'no-multiple-empty-lines': [2]
    }
}