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/**
* @fileoverview Rule to disallow use of Object.prototype builtins on objects
* @author Andrew Levine
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "disallow calling some `Object.prototype` methods directly on objects",
category: "Possible Errors",
recommended: false
},
schema: []
},
create(context) {
const DISALLOWED_PROPS = [
"hasOwnProperty",
"isPrototypeOf",
"propertyIsEnumerable"
];
/**
* Reports if a disallowed property is used in a CallExpression
* @param {ASTNode} node The CallExpression node.
* @returns {void}
*/
function disallowBuiltIns(node) {
if (node.callee.type !== "MemberExpression" || node.callee.computed) {
return;
}
const propName = node.callee.property.name;
if (DISALLOWED_PROPS.indexOf(propName) > -1) {
context.report({
message: "Do not access Object.prototype method '{{prop}}' from target object.",
loc: node.callee.property.loc.start,
data: { prop: propName },
node
});
}
}
return {
CallExpression: disallowBuiltIns
};
}
};
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