added code linting

.eslintrc

@@ -0,0 +1,114 @@
+parserOptions:
+  ecmaVersion: 2018
+
+env:
+  node: true
+  es6: true
+  jest: true
+  mocha: true
+  browser: true
+
+plugins:
+  - sonarjs
+  - security
+  - github
+
+extends:
+  - eslint:recommended
+  - plugin:sonarjs/recommended
+  - plugin:security/recommended
+
+rules:
+  # Ignore Rules
+  strict: 0
+  no-underscore-dangle: 0
+  no-mixed-requires: 0
+  no-process-exit: 0
+  no-warning-comments: 0
+  no-use-before-define: 0
+  curly: 0
+  no-multi-spaces: 0
+  no-alert: 0
+  consistent-return: 0
+  func-style: 0
+  max-nested-callbacks: 0
+  camelcase: 0
+  no-dupe-class-members: 0
+  security/detect-object-injection: 0
+  sonarjs/no-small-switch: 0
+  sonarjs/no-nested-template-literals: 0
+
+  # Warnings
+  no-debugger: 1
+  no-empty: 1
+  no-invalid-regexp: 1
+  no-unused-expressions: 1
+  no-native-reassign: 1
+  no-fallthrough: 1
+  sonarjs/cognitive-complexity: 1
+
+  # Errors
+  eqeqeq: 2
+  no-undef: 2
+  no-dupe-keys: 2
+  no-empty-character-class: 2
+  no-self-compare: 2
+  valid-typeof: 2
+  handle-callback-err: 2
+  no-shadow-restricted-names: 2
+  no-new-require: 2
+  no-mixed-spaces-and-tabs: 2
+  block-scoped-var: 2
+  no-else-return: 2
+  no-throw-literal: 2
+  no-void: 2
+  radix: 2
+  wrap-iife: 2
+  no-shadow: 0
+  no-path-concat: 2
+  valid-jsdoc: 0
+
+  # Stylistic errors
+  no-spaced-func: 2
+  semi-spacing: 2
+  quotes: 2
+  key-spacing: 2
+  indent: 2
+  no-lonely-if: 2
+  no-floating-decimal: 2
+  brace-style: 2
+  comma-style: 2
+  no-multiple-empty-lines: 2
+  no-nested-ternary: 2
+  operator-assignment: 2
+  padded-blocks: 2
+  quote-props: 2
+  keyword-spacing: 2
+  space-before-blocks: 2
+  array-bracket-spacing: 2
+  computed-property-spacing: 2
+  space-in-parens: 2
+  space-unary-ops: 2
+  wrap-regex: 2
+  linebreak-style: 0
+  semi: 2
+  arrow-spacing: 2
+  no-class-assign: 2
+  no-const-assign: 2
+  no-this-before-super: 2
+  no-var: 2
+  object-shorthand: 2
+  prefer-arrow-callback: 2
+  prefer-const: 2
+  prefer-spread: 2
+  prefer-template: 2
+
+overrides:
+  - files:
+      - "test/**"
+      - "*.spec.js"
+      - "*.test.js"
+    rules:
+      prefer-arrow-callback: 0
+      sonarjs/no-duplicate-string: 0
+      security/detect-object-injection: 0