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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: { | |
| type: "problem", | |
| docs: { | |
| description: "disallow calling some `Object.prototype` methods directly on objects", | |
| category: "Possible Errors", | |
| recommended: true, | |
| url: "https://eslint.org/docs/rules/no-prototype-builtins" | |
| }, | |
| 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 | |
| }; | |
| } | |
| }; |