Add project files

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{*.json,*.yml,*.yaml}]
+indent_size = 2
+indent_style = space

.gitignore

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+/node_modules/

LICENSE

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+MIT License
+
+Copyright (c) 2020 Web Scrobbler Team
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# eslint-config-web-scrobbler
+
+ESLint configuration file for Web Scrobbler projects.
+
+## Usage
+
+You can install `eslint-config-web-scrobbler` by a following way:
+```sh
+> npm install --save-dev eslint-config-web-scrobbler
+```
+
+Then, add `eslint-config-web-scrobbler` to the `extends` array in your
+`.eslintrc.*` file.
+```json
+{
+  "extends": [
+    "some-other-config-you-use",
+    "web-scrobbler"
+  ]
+}
+```
+
+## License
+
+Licensed under the [MIT License](./LICENSE)

index.js

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+'use strict';
+
+module.exports = {
+	'env': {
+		'es6': true,
+		'node': true,
+	},
+	'extends': [
+		'eslint:recommended'
+	],
+	'plugins': [
+		'jsdoc'
+	],
+	'rules': {
+		/*
+		 * Possible errors
+		 */
+
+		// Enforce "for" loop update clause moving the counter
+		// in the right direction
+		'for-direction': 'error',
+
+		// Disallow unnecessary parentheses
+		'no-extra-parens': 'error',
+
+		// Disallow template literal placeholder syntax in regular string
+		'no-template-curly-in-string': 'error',
+
+		/*
+		 * Best practices
+		 */
+
+		// Enforce consistent brace style for all control statements
+		'curly': 'error',
+
+		// Require the use of === and !==
+		'eqeqeq': 'error',
+
+		// Disallow `else` blocks after `return` statements in `if` statements
+		'no-else-return': 'error',
+
+		// Disallow empty functions
+		'no-empty-function': 'error',
+
+		// Disallow function declarations and expressions inside loop statements
+		'no-loop-func': 'error',
+
+		// Disallow new operators with the String, Number, and Boolean objects
+		'no-new-wrappers': 'error',
+
+		// Disallow reassigning function parameters
+		'no-param-reassign': 'error',
+
+		// Disallow unnecessary concatenation of strings
+		'no-useless-concat': 'error',
+
+		// Disallow redundant return statements
+		'no-useless-return': 'error',
+
+		/*
+		 * Strict mode
+		 */
+
+		// Require global strict mode directive
+		'strict': ['error', 'global'],
+
+		/*
+		 * Stylistic issues
+		 */
+
+		// Require 'one true brace style', in which the opening brace
+		// of a block is placed on the same line as its corresponding
+		// statement or declaration
+		'brace-style': ['error', '1tbs'],
+
+		// Disallow spaces inside of brackets
+		'array-bracket-spacing': ['error', 'never'],
+
+		// Require CamelCase
+		'camelcase': ['error', { 'properties': 'never' }],
+
+		// Require space after comma
+		'comma-spacing': ['error', { 'after': true }],
+
+		// Require newline at the end of files
+		'eol-last': ['error', 'always'],
+
+		// Disallow spacing between function identifiers and their invocations
+		'func-call-spacing': 'error',
+
+		// Use tabs as indentation
+		// Enforce indentation level for case clauses in switch statements
+		'indent': [
+			'error', 'tab', { 'SwitchCase': 1 }
+		],
+
+		// Require space after colon in object literal properties
+		'key-spacing': [
+			'error', { 'afterColon': true }
+		],
+
+		// Require space before and after keywords
+		'keyword-spacing': 'error',
+
+		// Require Unix line endings
+		'linebreak-style': ['error', 'unix'],
+
+		// Disallow empty block statements
+		'no-empty': [
+			'error', { 'allowEmptyCatch': true }
+		],
+
+		// Disallow `if` statements as the only statement in `else` blocks
+		'no-lonely-if': 'error',
+
+		// Disallow multiple spaces
+		'no-multi-spaces': 'error',
+
+		// Disallow nested ternary expressions
+		'no-nested-ternary': 'error',
+
+		// Disallow trailing whitespace at the end of lines
+		'no-trailing-spaces': 'error',
+
+		// Disallow ternary operators when simpler alternatives exist
+		'no-unneeded-ternary': 'error',
+
+		// Disallow whitespace before properties
+		'no-whitespace-before-property': 'error',
+
+		'one-var': ['error', 'never'],
+
+		// Require spaces inside curly braces
+		'object-curly-spacing': ['error', 'always'],
+
+		// Require single quotes
+		'quotes': ['error', 'single'],
+
+		// Require space before blocks
+		'space-before-blocks': ['error', 'always'],
+
+		// Disallow a space before function parenthesis
+		'space-before-function-paren': ['error', 'never'],
+
+		// Disallow spaces inside of parentheses
+		'space-in-parens': 'error',
+
+		// Require spacing around infix operators
+		'space-infix-ops': 'error',
+
+		// Enforce consistent spacing after the // or /* in a comment
+		'spaced-comment': 'error',
+
+		// Require semicolon at the end of statement
+		'semi': ['error', 'always'],
+
+		// Enforce spacing around colons of switch statements
+		'switch-colon-spacing': [
+			'error', { 'after': true, 'before': false }
+		],
+
+		/*
+		 * ECMAScript 6
+		 */
+
+		// Require parentheses around arrow function arguments
+		'arrow-parens': 'error',
+		'arrow-spacing': 'error',
+
+		// Require let or const instead of var
+		'no-var': 'error',
+
+		// Require method and property shorthand syntax for object literals
+		'object-shorthand': ['error', 'always'],
+
+		// Require `const` declarations for variables
+		// that are never reassigned after declared
+		'prefer-const': [
+			'error', { 'destructuring': 'all' }
+		],
+
+		// Require template literals instead of string concatenation
+		'prefer-template': 'error',
+
+		// Disallow spacing around embedded expressions of template strings
+		'template-curly-spacing': 'error',
+
+		/*
+		 * JSDoc plugin
+		 */
+
+		'jsdoc/check-param-names': 'warn',
+		'jsdoc/check-syntax': 'warn',
+		'jsdoc/check-tag-names': 'warn',
+		'jsdoc/check-types': [
+			'warn', { 'noDefaults': true }
+		],
+		'jsdoc/no-undefined-types': 'warn',
+		'jsdoc/require-param': 'warn',
+		'jsdoc/require-param-description': 'warn',
+		'jsdoc/require-param-name': 'warn',
+		'jsdoc/require-param-type': 'warn',
+		'jsdoc/require-returns-check': 'warn',
+		'jsdoc/require-returns-description': 'warn',
+		'jsdoc/require-returns-type': 'warn',
+		'jsdoc/valid-types': 'warn',
+	},
+	'settings': {
+		'jsdoc': {
+			'tagNamePreference': {
+				'class': 'constructor', 'returns': 'return'
+			}
+		},
+	},
+};