arrow-body-style.js
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/**
* @fileoverview Rule to require braces in arrow function body.
* @author Alberto Rodríguez
* @copyright 2015 Alberto Rodríguez. All rights reserved.
* See LICENSE file in root directory for full license.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var always = context.options[0] === "always";
var asNeeded = !context.options[0] || context.options[0] === "as-needed";
/**
* Determines whether a arrow function body needs braces
* @param {ASTNode} node The arrow function node.
* @returns {void}
*/
function validate(node) {
var arrowBody = node.body;
if (arrowBody.type === "BlockStatement") {
var blockBody = arrowBody.body;
if (blockBody.length > 1) {
return;
}
if (blockBody.length === 0) {
var hasComments = context.getComments(arrowBody).trailing.length > 0;
if (hasComments) {
return;
}
context.report({
node: node,
loc: arrowBody.loc.start,
message: "Unexpected empty block in arrow body."
});
} else {
if (asNeeded && blockBody[0].type === "ReturnStatement") {
context.report({
node: node,
loc: arrowBody.loc.start,
message: "Unexpected block statement surrounding arrow body."
});
}
}
} else {
if (always) {
context.report({
node: node,
loc: arrowBody.loc.start,
message: "Expected block statement surrounding arrow body."
});
}
}
}
return {
"ArrowFunctionExpression": validate
};
};
module.exports.schema = [
{
"enum": ["always", "as-needed"]
}
];