kitchensink
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Dispatch's awesome components and style guide
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JavaScript
/**
* Requires parentheses around arrow function expressions with a single parameter.
*
* Type: `Boolean`
*
* Value: `true`
*
* Version: `ES6`
*
* #### Example
*
* ```js
* "requireParenthesesAroundArrowParam": true
* ```
*
* ##### Valid
*
* ```js
* [1, 2, 3].map((x) => x * x);
* // params are always required for multiple parameters
* [1, 2, 3].map((x, y, z) => x * x);
* ```
*
* ##### Invalid
*
* ```js
* [1, 2, 3].map(x => x * x);
* ```
*/
var assert = require('assert');
module.exports = function() {};
module.exports.prototype = {
configure: function(options) {
assert(
options === true,
this.getOptionName() + ' option requires a true value or should be removed'
);
},
getOptionName: function() {
return 'requireParenthesesAroundArrowParam';
},
check: function(file, errors) {
function isWrapped(node) {
var openParensToken = file.getPrevToken(file.getFirstNodeToken(node));
var closingParensToken = file.getNextToken(file.getLastNodeToken(node));
var closingTokenValue = closingParensToken ? closingParensToken.value : '';
return openParensToken.value + closingTokenValue === '()';
}
file.iterateNodesByType('ArrowFunctionExpression', function(node) {
var params = node.params;
var firstParam = params[0];
if (params.length === 1 && !isWrapped(firstParam)) {
errors.add(
'Wrap arrow function expressions in parentheses',
firstParam.loc.start
);
}
});
}
};