.eslintrc.js

module.exports = {
  env: {
    browser: true,
    commonjs: true,
    es2021: true,
    mocha: true,
  },
  globals: {
    expect: true,
  },
  extends: 'standard',
  overrides: [
  ],
  parserOptions: {
    ecmaVersion: 'latest',
  },
  rules: {
    'function-paren-newline': ['error', 'consistent'],
    'comma-dangle': ['error', {
      arrays: 'always-multiline',
      objects: 'always-multiline',
      imports: 'always-multiline',
      exports: 'always-multiline',
      functions: 'always-multiline',
    }],
    indent: ['error', 2, {
      SwitchCase: 1,
      VariableDeclarator: 1,
      outerIIFEBody: 1,
      // MemberExpression: null,
      FunctionDeclaration: {
        parameters: 1,
        body: 1,
      },
      FunctionExpression: {
        parameters: 1,
        body: 1,
      },
      CallExpression: {
        arguments: 1,
      },
      ArrayExpression: 1,
      ObjectExpression: 1,
      ImportDeclaration: 1,
      flatTernaryExpressions: false,
      ignoreComments: false,
    }],
    'no-unused-expressions': ['error', {
      allowShortCircuit: false,
      allowTernary: false,
      allowTaggedTemplates: false,
    }],
    'max-len': ['error', {
      code: 80,
      comments: 80,
      ignoreTemplateLiterals: true,
    }],
    semi: ['error', 'always'],
    'semi-style': ['error', 'last'],
    'space-before-function-paren': ['error', 'never'],
    'no-var': 'error',
    'prefer-const': 'error',
    curly: ['error', 'all'],
    'no-shadow': [
      'error',
      {
        builtinGlobals: true,
        hoist: 'all',
        allow: [],
      },
    ],
    'no-redeclare': ['error', { builtinGlobals: true }],
    'no-param-reassign': 'error',
    'operator-linebreak': ['error', 'before'],
    'no-console': 'error',
    'standard/no-callback-literal': 0,
    'import/prefer-default-export': 0,
    'padding-line-between-statements': [
      'error',
      {
        blankLine: 'always',
        prev: ['const', 'let', 'var'],
        next: '*',
      },
      {
        blankLine: 'always',
        prev: '*',
        next: ['return', 'block-like', 'multiline-expression'],
      },
      {
        blankLine: 'always',
        prev: '*',
        next: ['const', 'let', 'var'],
      },
      {
        blankLine: 'any',
        prev: ['const', 'let', 'var'],
        next: ['const', 'let', 'var'],
      },
    ],
    'brace-style': ['error', '1tbs'],
    'object-curly-newline': [2, {
      ObjectExpression: {
        consistent: true,
        minProperties: 4,
      },
    }],
  },
};