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103 lines
3.1 KiB
103 lines
3.1 KiB
/**
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* @fileoverview Rule to flag adding properties to native object's prototypes.
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* @author David Nelson
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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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var BUILTINS = [
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"Object", "Function", "Array", "String", "Boolean", "Number", "Date",
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"RegExp", "Error", "EvalError", "RangeError", "ReferenceError",
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"SyntaxError", "TypeError", "URIError"
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];
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = function(context) {
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var config = context.options[0] || {};
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var exceptions = config.exceptions || [];
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var modifiedBuiltins = BUILTINS;
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if (exceptions.length) {
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modifiedBuiltins = BUILTINS.filter(function(builtIn) {
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return exceptions.indexOf(builtIn) === -1;
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});
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}
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return {
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// handle the Array.prototype.extra style case
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"AssignmentExpression": function(node) {
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var lhs = node.left, affectsProto;
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if (lhs.type !== "MemberExpression" || lhs.object.type !== "MemberExpression") {
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return;
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}
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affectsProto = lhs.object.computed ?
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lhs.object.property.type === "Literal" && lhs.object.property.value === "prototype" :
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lhs.object.property.name === "prototype";
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if (!affectsProto) {
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return;
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}
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modifiedBuiltins.forEach(function(builtin) {
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if (lhs.object.object.name === builtin) {
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context.report(node, builtin + " prototype is read only, properties should not be added.");
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}
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});
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},
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// handle the Object.defineProperty(Array.prototype) case
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"CallExpression": function(node) {
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var callee = node.callee,
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subject,
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object;
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// only worry about Object.defineProperty
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if (callee.type === "MemberExpression" &&
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callee.object.name === "Object" &&
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callee.property.name === "defineProperty") {
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// verify the object being added to is a native prototype
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subject = node.arguments[0];
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object = subject.object;
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if (object &&
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object.type === "Identifier" &&
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(modifiedBuiltins.indexOf(object.name) > -1) &&
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subject.property.name === "prototype") {
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context.report(node, object.name + " prototype is read only, properties should not be added.");
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}
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}
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}
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};
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};
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module.exports.schema = [
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{
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"type": "object",
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"properties": {
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"exceptions": {
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"type": "array",
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"items": {
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"type": "string"
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},
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"uniqueItems": true
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}
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},
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"additionalProperties": false
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}
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];
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