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/**
* @fileoverview Rule to flag for-in loops without if statements inside
* @author Nicholas C. Zakas
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require `for-in` loops to include an `if` statement",
category: "Best Practices",
recommended: false,
url: "https://eslint.org/docs/rules/guard-for-in"
},
schema: []
},
create(context) {
return {
ForInStatement(node) {
/*
* If the for-in statement has {}, then the real body is the body
* of the BlockStatement. Otherwise, just use body as provided.
*/
const body = node.body.type === "BlockStatement" ? node.body.body[0] : node.body;
if (body && body.type !== "IfStatement") {
context.report({ node, message: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype." });
}
}
};
}
};
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