/**
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* @fileoverview Rule to disallow use of Object.prototype builtins on objects
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* @author Andrew Levine
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "disallow calling some `Object.prototype` methods directly on objects",
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category: "Possible Errors",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-prototype-builtins"
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},
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schema: [],
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messages: {
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prototypeBuildIn: "Do not access Object.prototype method '{{prop}}' from target object."
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}
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},
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create(context) {
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const DISALLOWED_PROPS = [
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"hasOwnProperty",
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"isPrototypeOf",
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"propertyIsEnumerable"
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];
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/**
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* Reports if a disallowed property is used in a CallExpression
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* @param {ASTNode} node The CallExpression node.
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* @returns {void}
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*/
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function disallowBuiltIns(node) {
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const callee = astUtils.skipChainExpression(node.callee);
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if (callee.type !== "MemberExpression") {
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return;
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}
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const propName = astUtils.getStaticPropertyName(callee);
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if (propName !== null && DISALLOWED_PROPS.indexOf(propName) > -1) {
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context.report({
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messageId: "prototypeBuildIn",
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loc: callee.property.loc,
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data: { prop: propName },
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node
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});
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}
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}
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return {
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CallExpression: disallowBuiltIns
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};
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}
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};
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