no-empty.js
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/**
* @fileoverview Rule to flag use of an empty block statement
* @author Nicholas C. Zakas
* @copyright Nicholas C. Zakas. All rights reserved.
* @copyright 2015 Dieter Oberkofler. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
return {
"BlockStatement": function(node) {
var parent = node.parent,
parentType = parent.type;
// if the body is not empty, we can just return immediately
if (node.body.length !== 0) {
return;
}
// a function is generally allowed to be empty
if (parentType === "FunctionDeclaration" || parentType === "FunctionExpression" || parentType === "ArrowFunctionExpression") {
return;
}
// any other block is only allowed to be empty, if it contains a comment
if (context.getComments(node).trailing.length > 0) {
return;
}
context.report(node, "Empty block statement.");
},
"SwitchStatement": function(node) {
if (typeof node.cases === "undefined" || node.cases.length === 0) {
context.report(node, "Empty switch statement.");
}
}
};
};
module.exports.schema = [];