1+ {
2+ "extends": "airbnb-base",
3+ "parserOptions": {
4+ "sourceType": "script"
5+ },
6+
7+ "rules": {
8+ // === Configure rules for our style ===
9+ // imports must be resolvable
10+ "import/no-unresolved": "error",
11+ // use single quotes,
12+ // unless a different style allows avoiding escapes
13+ "quotes": ["error", "single", {
14+ "avoidEscape": true,
15+ "allowTemplateLiterals": true
16+ }],
17+ // allow else-if return
18+ "no-else-return": [ "error", { "allowElseIf": true } ],
19+ // expressions split over multiple lines
20+ // should break after the operator
21+ "operator-linebreak": [ "error", "after" ],
22+ // require arrow parens only when needed
23+ // and whenever the body is a block
24+ "arrow-parens": ["error", "as-needed", { "requireForBlockBody": true }],
25+ // what variables are errors in callbacks
26+ "handle-callback-err": [ "error","^(e$|(e|(.*(_e|E)))rr)" ],
27+ // allow dangling commas in functions
28+ // require them everywhere else
29+ "comma-dangle": ["error", {
30+ "arrays": "always-multiline",
31+ "objects": "always-multiline",
32+ "imports": "always-multiline",
33+ "exports": "always-multiline",
34+ "functions": "only-multiline"
35+ }],
36+ // we actually encourage `return await`
37+ "no-return-await": "off",
38+ // allow `while (true)`
39+ "no-constant-condition": ["error", { "checkLoops": false }],
40+ // allow ignoring an error with `catch`
41+ "no-empty": ["error", { "allowEmptyCatch": true }],
42+ // allow `3 + 5 - 1`, but not `3 * 5 - 1`
43+ "no-mixed-operators": ["error", { "allowSamePrecedence": true }],
44+ // require `'use strict';`
45+ "strict": ["error", "global"],
46+ // we actually use tabs for indentation
47+ "indent": ["error", "tab", { "SwitchCase": 1 }],
48+ "no-tabs": "off",
49+ // we want `== null` to also handle undefined
50+ "no-eq-null": "off",
51+ // allow `for (..; i++)`
52+ "no-plusplus": ["error", { "allowForLoopAfterthoughts": true }],
53+ // allow using functions defined later
54+ "no-use-before-define": ["error", "nofunc"],
55+ // require consistent newlines before and after braces
56+ // if contents are multiline
57+ "object-curly-newline": ["error", { "consistent": true, "multiline": true }],
58+ // require consistent linebreaks inline function parenthesis (arguments or params)
59+ "function-paren-newline": ["error", "consistent"],
60+ // only require const if all parts of destructuring can be const
61+ "prefer-const": ["error", { "destructuring": "all" }],
62+ // don't require destructuring for arrays or assignment
63+ "prefer-destructuring": ["error", {
64+ "VariableDeclarator": { "array": false, "object": true },
65+ "AssignmentExpression": { "array": false, "object": false }
66+ }],
67+ // identical to airbnb rule, except for allowing for..of, because we want to use it
68+ "no-restricted-syntax": [
69+ "error",
70+ {
71+ "selector": "ForInStatement",
72+ "message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array."
73+ },
74+ {
75+ "selector": "LabeledStatement",
76+ "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
77+ },
78+ {
79+ "selector": "WithStatement",
80+ "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
81+ }
82+ ],
83+ // allow lines of up to 120 characters
84+ "max-len": ["error", { "code": 120, "tabWidth": 2, "ignoreUrls": true, "ignoreStrings": true, "ignoreTemplateLiterals": true, "ignoreRegExpLiterals": true }],
85+
86+ // === Disable rules ===
87+ // more liberal naming
88+ "camelcase": "off",
89+ "no-underscore-dangle": "off",
90+ // don't require anonymous function names
91+ "func-names": "off",
92+ // allow console
93+ "no-console": "off",
94+ // allow new for side effects
95+ // allow new with non-capitalized
96+ "no-new": "off",
97+ "new-cap": "off",
98+ // allow shadowing variables (usually callbacks)
99+ "no-shadow": "off",
100+ // allow multiple empty lines in a row
101+ "no-multiple-empty-lines": "off",
102+ // allow not using object shorthand
103+ "object-shorthand": "off",
104+
105+ // TODO
106+ "consistent-return": "off",
107+ "no-restricted-globals": "off",
108+ "no-prototype-builtins": "off",
109+ "import/no-extraneous-dependencies": "off",
110+ "import/no-dynamic-require": "off",
111+ "global-require": "off",
112+ "no-param-reassign": "off",
113+ "default-case": "off"
114+ }
115+ }
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