no-extend-native
禁止扩展原生类型
在 JavaScript 中,您可以扩展任何对象,包括内置对象或 "native" 对象。有时人们会改变这些原生对象的行为,从而打破在代码的其他部分对它们所做的假设。
例如,这里我们覆盖了一个内置方法,该方法将影响所有对象,甚至是其他内置方法。
// seems harmless
Object.prototype.extra = 55;
// loop through some userIds
var users = {
"123": "Stan",
"456": "David"
};
// not what you'd expect
for (var id in users) {
console.log(id); // "123", "456", "extra"
}
避免这个问题的一个常见建议是用 users.hasOwnProperty(id)
包裹 for
循环的内部。但是,如果在整个代码库中严格执行此规则,则无需采取该步骤。
规则详情
不允许直接修改内置对象的原型。
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/*eslint no-extend-native: "error"*/
Object.prototype.a = "a";
Object.defineProperty(Array.prototype, "times", { value: 999 });
选项
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exceptions
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/*eslint no-extend-native: ["error", { "exceptions": ["Object"] }]*/
Object.prototype.a = "a";
已知限制
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var x = Object;
x.prototype.thing = a;
eval("Array.prototype.forEach = 'muhahaha'");
with(Array) {
prototype.thing = 'thing';
};
window.Function.prototype.bind = 'tight';
何时不使用
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