[eslint] Enforce arrow-parens #3207
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It reduces the cost of adding a new argument.
And it prevents the incorrect use of arrow functions in conditionals:
```js
if (a => b) {
}
```
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oliviertassinari
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…arens [eslint] Enforce arrow-parens
zannager
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It reduces the cost of adding a new argument.
And it prevents the incorrect use of arrow functions in conditionals:
http://eslint.org/docs/rules/arrow-parens.html
https://github.com/airbnb/javascript#arrow-functions