* add lint tools (#61)

.eslintrc.yml

@@ -0,0 +1,305 @@
+# https://eslint.org/
+env: # https://eslint.org/docs/user-guide/configuring#specifying-environments
+  es6: true
+  node: true
+extends:
+  - eslint:recommended
+  - plugin:@typescript-eslint/eslint-recommended
+  - plugin:@typescript-eslint/recommended
+plugins:
+- import
+- "@typescript-eslint"
+parser: "@typescript-eslint/parser"
+parserOptions:
+  sourceType: module
+  project: ./tsconfig.json
+rules: # https://eslint.org/docs/rules/
+  accessor-pairs: error
+  array-bracket-newline: error
+  array-bracket-spacing:
+  - error
+  - never
+  array-callback-return: error
+  arrow-body-style: 'off'
+  arrow-parens:
+  - error
+  - always
+  arrow-spacing:
+  - error
+  - after: true
+    before: true
+  block-scoped-var: error
+  block-spacing: error
+  brace-style:
+  - error
+  - allman
+  callback-return: error
+  capitalized-comments: 'off'
+  class-methods-use-this: error
+  comma-dangle:
+  - error
+  - always-multiline
+  comma-spacing:
+  - error
+  - after: true
+    before: false
+  comma-style:
+  - error
+  - last
+  complexity:
+  - error
+  computed-property-spacing:
+  - error
+  - never
+  consistent-return: 'off'
+  consistent-this: error
+  curly: error
+  default-case: 'off'
+  dot-location:
+  - error
+  - property
+  dot-notation:
+  - error
+  - allowKeywords: true
+  eol-last: error
+  eqeqeq: error
+  for-direction: error
+  func-call-spacing: error
+  func-name-matching: error
+  func-names:
+  - error
+  - never
+  func-style:
+  - error
+  - declaration
+  function-paren-newline: error
+  generator-star-spacing: error
+  getter-return: error
+  global-require: error
+  guard-for-in: error
+  handle-callback-err: error
+  id-blacklist: error
+  id-length: 'off'
+  id-match: error
+  implicit-arrow-linebreak:
+  - error
+  - below
+  indent:
+  - error
+  - tab
+  indent-legacy: 'off'
+  init-declarations: error
+  jsx-quotes: error
+  key-spacing: error
+  keyword-spacing:
+  - error
+  - overrides:
+      if:
+        after: false
+      for:
+        after: false
+      while:
+        after: false
+      catch:
+        after: false
+      with:
+        after: false
+  line-comment-position: 'off'
+  linebreak-style:
+  - error
+  - unix
+  lines-around-comment: 'off'
+  lines-around-directive: error
+  lines-between-class-members:
+  - error
+  - always
+  max-depth: error
+  max-len: 'off'
+  max-lines: 'off'
+  max-nested-callbacks: error
+  max-params: 'off'
+  max-statements: 'off'
+  max-statements-per-line: error
+  multiline-comment-style:
+  - error
+  - separate-lines
+  multiline-ternary: error
+  new-cap: error
+  new-parens: error
+  newline-after-var: 'off'
+  newline-before-return: 'off'
+  no-alert: error
+  no-array-constructor: error
+  no-await-in-loop: error
+  no-bitwise: error
+  no-buffer-constructor: error
+  no-caller: error
+  no-catch-shadow: error
+  no-confusing-arrow: error
+  no-continue: 'off'
+  no-div-regex: error
+  no-duplicate-imports: error
+  no-else-return: 'off'
+  no-empty-function: 'off'
+  no-eq-null: error
+  no-eval: error
+  no-extend-native: error
+  no-extra-bind: error
+  no-extra-label: error
+  no-extra-parens: error
+  no-floating-decimal: error
+  no-implicit-coercion: error
+  no-implicit-globals: error
+  no-implied-eval: error
+  no-inline-comments: 'off'
+  no-invalid-this: error
+  no-iterator: error
+  no-label-var: error
+  no-labels: error
+  no-lonely-if: error
+  no-loop-func: error
+  no-magic-numbers: 'off'
+  no-mixed-operators: error
+  no-mixed-requires: error
+  no-multi-assign: error
+  no-multi-spaces: error
+  no-multi-str: error
+  no-multiple-empty-lines:
+  - error
+  - max: 1
+  no-native-reassign: error
+  no-negated-condition: error
+  no-negated-in-lhs: error
+  no-nested-ternary: error
+  no-new: error
+  no-new-func: error
+  no-new-object: error
+  no-new-require: error
+  no-new-wrappers: error
+  no-octal-escape: error
+  no-param-reassign: 'off'
+  no-path-concat: error
+  no-plusplus: 'off'
+  no-process-env: 'off'
+  no-process-exit: error
+  no-proto: error
+  no-prototype-builtins: 'off'
+  no-restricted-globals: error
+  no-restricted-imports: error
+  no-restricted-modules: error
+  no-restricted-properties: error
+  no-restricted-syntax: error
+  no-return-assign: error
+  no-return-await: error
+  no-script-url: error
+  no-self-compare: error
+  no-sequences: error
+  no-shadow: error
+  no-shadow-restricted-names: error
+  no-spaced-func: error
+  no-sync: 'off'
+  no-tabs: 'off'
+  no-template-curly-in-string: error
+  no-ternary: error
+  no-throw-literal: error
+  no-trailing-spaces: error
+  no-undef-init: error
+  no-undefined: 'off'
+  no-underscore-dangle: 'off'
+  no-unmodified-loop-condition: error
+  no-unneeded-ternary: error
+  no-unused-expressions: error
+  no-use-before-define: 'off'
+  no-useless-call: error
+  no-useless-computed-key: error
+  no-useless-concat: error
+  no-useless-constructor: error
+  no-useless-rename: error
+  no-useless-return: error
+  no-var: error
+  no-void: error
+  no-warning-comments: error
+  no-whitespace-before-property: error
+  no-with: error
+  nonblock-statement-body-position: error
+  object-curly-newline: 'off'
+  object-curly-spacing:
+  - error
+  - never
+  object-property-newline: error
+  object-shorthand: 'off'
+  one-var: 'off'
+  one-var-declaration-per-line: error
+  operator-assignment: error
+  operator-linebreak: error
+  padded-blocks: 'off'
+  padding-line-between-statements: error
+  prefer-arrow-callback: error
+  prefer-const: error
+  prefer-destructuring: error
+  prefer-numeric-literals: error
+  prefer-promise-reject-errors: error
+  prefer-reflect: error
+  prefer-rest-params: error
+  prefer-spread: error
+  prefer-template: error
+  quote-props: 'off'
+  quotes: 'off'
+  radix: error
+  require-await: error
+  require-jsdoc: error
+  rest-spread-spacing:
+  - error
+  - never
+  semi: error
+  semi-spacing: error
+  semi-style:
+  - error
+  - last
+  sort-imports: 'off'
+  sort-keys: 'off'
+  sort-vars: error
+  space-before-blocks: error
+  space-before-function-paren: 'off'
+  space-in-parens:
+  - error
+  - never
+  space-infix-ops: error
+  space-unary-ops: error
+  spaced-comment:
+  - error
+  - always
+  strict: error
+  switch-colon-spacing: error
+  symbol-description: error
+  template-curly-spacing:
+  - error
+  - never
+  template-tag-spacing: error
+  unicode-bom:
+  - error
+  - never
+  valid-jsdoc:
+  - error
+  - requireParamType: false
+    requireReturn: false
+    requireReturnType: false
+  vars-on-top: error
+  wrap-iife: error
+  wrap-regex: error
+  yield-star-spacing: error
+  yoda:
+  - error
+  - never
+
+  # import plugin
+  import/extensions: 'off'
+  import/no-unresolved:
+  - error
+
+  # @typescript-eslint plugin
+  "@typescript-eslint/explicit-function-return-type": 'off'
+  "@typescript-eslint/no-use-before-define":
+  - error
+  - functions: false
+  "@typescript-eslint/strict-boolean-expressions": error