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/**
* @fileoverview Rule to require braces in arrow function body.
* @author Alberto RodrÃguez
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require braces around arrow function bodies",
category: "ECMAScript 6",
recommended: false
},
schema: {
anyOf: [
{
type: "array",
items: [
{
enum: ["always", "never"]
}
],
minItems: 0,
maxItems: 1
},
{
type: "array",
items: [
{
enum: ["as-needed"]
},
{
type: "object",
properties: {
requireReturnForObjectLiteral: {type: "boolean"}
},
additionalProperties: false
}
],
minItems: 0,
maxItems: 2
}
]
}
},
create: function(context) {
var options = context.options;
var always = options[0] === "always";
var asNeeded = !options[0] || options[0] === "as-needed";
var never = options[0] === "never";
var requireReturnForObjectLiteral = options[1] && options[1].requireReturnForObjectLiteral;
/**
* 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") {
if (never) {
context.report({
node: node,
loc: arrowBody.loc.start,
message: "Unexpected block statement surrounding arrow body."
});
} else {
var blockBody = arrowBody.body;
if (blockBody.length !== 1) {
return;
}
if (asNeeded && requireReturnForObjectLiteral && blockBody[0].type === "ReturnStatement" &&
blockBody[0].argument.type === "ObjectExpression") {
return;
}
if (asNeeded && blockBody[0].type === "ReturnStatement") {
context.report({
node: node,
loc: arrowBody.loc.start,
message: "Unexpected block statement surrounding arrow body."
});
}
}
} else {
if (always || (asNeeded && requireReturnForObjectLiteral && arrowBody.type === "ObjectExpression")) {
context.report({
node: node,
loc: arrowBody.loc.start,
message: "Expected block statement surrounding arrow body."
});
}
}
}
return {
ArrowFunctionExpression: validate
};
}
};
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