canonical
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Canonical code style linter and formatter for JavaScript, SCSS and CSS.
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JavaScript
/**
* Require arrow functions to use an expression body when returning a single statement
* (no block statement, implicit return).
*
* Type: `Boolean`
*
* Value: `true`
*
* Version: `ES6`
*
* #### Example
*
* ```js
* "requireShorthandArrowFunctions": true
* ```
*
* ##### Valid
*
* ```js
* // single expression
* evens.map(v => v + 1);
* // multiple statments require a block
* evens.map(v => {
* v = v + 1;
* return v;
* });
* ```
*
* ##### Invalid
*
* ```js
* evens.map(v => { return v + 1; });
* ```
*/
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 'requireShorthandArrowFunctions';
},
check: function(file, errors) {
file.iterateNodesByType('ArrowFunctionExpression', function(node) {
var body = node.body;
if (body.type === 'BlockStatement' &&
body.body.length === 1 &&
body.body[0].type === 'ReturnStatement') {
errors.add(
'Use the shorthand arrow function form',
node.body.loc.start
);
}
});
}
};