core.js

module.exports = {
  env: {
    es6: true
  },
  parserOptions: {
    ecmaVersion: 2018,
    sourceType: "module"
  },
  rules: {
    // ES6
    "arrow-parens": ["error", "always"],
    "comma-dangle": ["error", "never"],
    "eol-last": ["error", "always"],
    "generator-star-spacing": ["error", { before: false, after: true }],
    "no-var": "error",
    "no-useless-rename": "error",
    "object-shorthand": ["error", "always"],
    "prefer-destructuring": ["error", {
      "VariableDeclarator": {
        "array": true,
        "object": true
      },
      "AssignmentExpression": {
        "array": false,
        "object": false
      }
    }],
    "prefer-spread": "error",
    "prefer-template": "error",
    semi: ["error", "never"],
    "lines-between-class-members": [
      "error",
      "always",
      {
        exceptAfterSingleLine: true
      }
    ],
    "space-before-function-paren": [
      "error",
      {
        anonymous: "always",
        named: "never",
        asyncArrow: "always"
      }
    ],
    "arrow-spacing": [
      "error",
      {
        before: true,
        after: true
      }
    ]
  }
}