chore: eslint integration (#20)

.eslintignore

@@ -0,0 +1,5 @@
+node_modules
+public
+docs
+lib
+build

.eslintrc

@@ -0,0 +1,134 @@
+env:
+  es6: true
+  node: true
+
+parser: "@typescript-eslint/parser"
+
+plugins:
+  - "@typescript-eslint"
+  - sonarjs
+  - security
+
+extends:
+  - eslint:recommended
+  - plugin:@typescript-eslint/eslint-recommended
+  - plugin:@typescript-eslint/recommended
+  - plugin:sonarjs/recommended
+  - plugin:security/recommended
+
+parserOptions:
+  ecmaVersion: 2018
+  sourceType: module
+  ecmaFeatures: 
+    jsx: true
+settings:
+  react:
+    version: detect
+
+rules:
+  # Ignore Rules
+  strict: 0
+  no-underscore-dangle: 0
+  no-mixed-requires: 0
+  no-process-exit: 0
+  no-warning-comments: 0
+  curly: 0
+  no-multi-spaces: 0
+  no-alert: 0
+  consistent-return: 0
+  consistent-this: [0, self]
+  func-style: 0
+  max-nested-callbacks: 0
+  camelcase: 0
+
+  # Warnings
+  no-debugger: 1
+  no-empty: 1
+  no-invalid-regexp: 1
+  no-unused-expressions: 0
+  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
+  no-unused-vars: [2, { "args": "none" }]
+  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, outside]
+  no-shadow: 0
+  no-path-concat: 2
+  valid-jsdoc: [0, {requireReturn: false, requireParamDescription: false, requireReturnDescription: false}]
+
+  # stylistic errors
+  no-spaced-func: 2
+  semi-spacing: 2
+  quotes: [2, 'single']
+  key-spacing: [2, { beforeColon: false, afterColon: true }]
+  indent: [2, 2]
+  no-lonely-if: 2
+  no-floating-decimal: 2
+  brace-style: [2, 1tbs, { allowSingleLine: true }]
+  comma-style: [2, last]
+  no-multiple-empty-lines: [2, {max: 1}]
+  no-nested-ternary: 2
+  operator-assignment: [2, always]
+  padded-blocks: [2, never]
+  quote-props: [2, as-needed]
+  keyword-spacing: [2, {'before': true, 'after': true, 'overrides': {}}]
+  space-before-blocks: [2, always]
+  array-bracket-spacing: [2, never]
+  computed-property-spacing: [2, never]
+  space-in-parens: [2, never]
+  space-unary-ops: [2, {words: true, nonwords: false}]
+  wrap-regex: 2
+  linebreak-style: 0
+  semi: [2, always]
+  arrow-spacing: [2, {before: true, after: true}]
+  no-class-assign: 2
+  no-const-assign: 2
+  no-dupe-class-members: 2
+  no-this-before-super: 2
+  no-var: 2
+  object-shorthand: [2, always]
+  prefer-arrow-callback: 2
+  prefer-const: 2
+  prefer-spread: 2
+  prefer-template: 2
+
+  # Security
+  "security/detect-non-literal-fs-filename": off
+
+  # TypeScript
+  "@typescript-eslint/no-empty-interface": "off"
+  # disable JS rule 
+  no-use-before-define: "off"
+  "@typescript-eslint/no-use-before-define": ["error"]
+  "@typescript-eslint/no-empty-function": "off"
+  "@typescript-eslint/ban-ts-comment": "off"
+  "@typescript-eslint/no-explicit-any": "off"
+  "@typescript-eslint/explicit-module-boundary-types": "off"
+  "@typescript-eslint/no-this-alias": "off"
+
+overrides:
+  - files: 
+      - "*.spec.ts"
+      - "*.test.ts"
+    rules:
+      no-undef: "off"
+      no-console: "off"
+      prefer-arrow-callback: 0
+      sonarjs/no-duplicate-string: 0
+      security/detect-object-injection: 0

.sonarcloud.properties

@@ -0,0 +1,2 @@
+# Disable duplicate code in tests since it would introduce more complexity to reduce it.
+sonar.cpd.exclusions=**/*.test.ts,**/*.spec.ts

jest.config.js

@@ -23,7 +23,7 @@ module.exports = {
 
   testTimeout: 20000,
 
-  setupFiles: ["./tests/jest.setup.ts"],
+  setupFiles: ['./tests/jest.setup.ts'],
   globals: {
     'ts-jest': {
       tsconfig: 'tsconfig.json',