Add eslint

.eslintrc.js

@@ -0,0 +1,84 @@
+module.exports = {
+  parser: '@typescript-eslint/parser',
+  env: {
+    node: true,
+  },
+  extends: [
+    'standard',
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+  ],
+  plugins: ['import', '@typescript-eslint', 'prettier'],
+  parserOptions: {
+    project: './tsconfig.json',
+    ecmaVersion: 2018,
+    sourceType: 'module',
+    warnOnUnsupportedTypeScriptVersion: false,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  extends: [
+    'plugin:functional/external-recommended',
+    'plugin:functional/recommended',
+  ],
+  rules: {
+    'prettier/prettier': 'error',
+    '@typescript-eslint/no-floating-promises': 'error',
+    'require-await': 'error',
+    'comma-spacing': ['error', { before: false, after: true }],
+    'import/no-namespace': 'error',
+    'import/no-default-export': 'error',
+    'no-invalid-this': 'error',
+    'no-autofix/no-unreachable': 'error',
+    'space-in-parens': 'error',
+    '@typescript-eslint/no-unused-vars': 'error',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+    'space-before-function-paren': 'off',
+    'eol-last': 'off',
+    'operator-linebreak': 'off',
+    'no-useless-escape': 'off',
+    'no-var': 'error',
+    'no-console': 'error',
+    'no-func-assign': 'error',
+    'no-const-assign': 'error',
+    'no-class-assign': 'error',
+    'no-param-reassign': 'error',
+    'object-curly-spacing': ['error', 'always'],
+    'array-bracket-spacing': ['error', 'never'],
+    'linebreak-style': ['error', 'unix'],
+    'no-trailing-spaces': 'error',
+    'import/no-duplicates': 'error',
+    'import/named': 'error',
+    'import/default': 'error',
+    'import/order': [
+      'error',
+      {
+        groups: [
+          ['builtin', 'external', 'internal', 'unknown'],
+          ['parent', 'sibling', 'index'],
+        ],
+        alphabetize: { order: 'asc', caseInsensitive: true },
+        'newlines-between': 'always',
+      },
+    ],
+    camelcase: ['error', { properties: 'never' }],
+
+    // enforced functional rules
+    'prefer-const': 'error',
+    'functional/prefer-type-literal': 'error',
+    'functional/no-loop-statement': 'error',
+    'functional/no-let': 'error',
+
+    // not enforced functional rules
+    'functional/immutable-data': 'off',
+    'functional/no-try-statement': 'off',
+    'functional/no-throw-statement': 'off',
+    'functional/no-expression-statement': 'off',
+    'functional/prefer-readonly-type': 'off',
+    'functional/functional-parameters': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    'functional/no-conditional-statement': 'off',
+    'functional/no-mixed-type': 'off',
+  },
+}