prefer-reflect

此规则在 ESLint v3.9.0 中已弃用，不会被替换。这条规则的初衷现在似乎被误导了，因为我们已经了解到 Reflect 方法实际上并不是要替换规则建议的 Object 对应物，而是作为低级原语存在，与代理一起使用以复制默认值各种先前存在的功能的行为。

请注意：此规则包含不正确的行为 - 它会建议您使用 Reflect.getOwnPropertyNames 而不是 Object.getOwnPropertyNames，但前一个在规范中不存在。我们建议将 exceptions 选项与 "getOwnPropertyNames" 一起使用，以避免这种错误建议。

ES6 Reflect API 附带了一些方法，它们在一定程度上弃用了旧构造函数的方法：

Reflect.apply 有效地弃用了 Function.prototype.apply 和 Function.prototype.call
Reflect.deleteProperty 有效地弃用了 delete 关键字
Reflect.getOwnPropertyDescriptor 有效地弃用了 Object.getOwnPropertyDescriptor
Reflect.getPrototypeOf 有效地弃用了 Object.getPrototypeOf
Reflect.setPrototypeOf 有效地弃用了 Object.setPrototypeOf
Reflect.preventExtensions 有效地弃用了 Object.preventExtensions

prefer-reflect 规则将标记任何旧方法的使用，建议改用较新的 Reflect 版本。

规则详情

选项

异常

"prefer-reflect": [<enabled>, { "exceptions": [<...exceptions>] }]

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Reflect.apply

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/*eslint prefer-reflect: "error"*/

myFunction.apply(undefined, args);
myFunction.apply(null, args);
obj.myMethod.apply(obj, args);
obj.myMethod.apply(other, args);

myFunction.call(undefined, arg);
myFunction.call(null, arg);
obj.myMethod.call(obj, arg);
obj.myMethod.call(other, arg);

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/*eslint prefer-reflect: "error"*/

Reflect.apply(myFunction, undefined, args);
Reflect.apply(myFunction, null, args);
Reflect.apply(obj.myMethod, obj, args);
Reflect.apply(obj.myMethod, other, args);
Reflect.apply(myFunction, undefined, [arg]);
Reflect.apply(myFunction, null, [arg]);
Reflect.apply(obj.myMethod, obj, [arg]);
Reflect.apply(obj.myMethod, other, [arg]);

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/*eslint prefer-reflect: ["error", { "exceptions": ["apply"] }]*/

// in addition to Reflect.apply(...):
myFunction.apply(undefined, args);
myFunction.apply(null, args);
obj.myMethod.apply(obj, args);
obj.myMethod.apply(other, args);

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/*eslint prefer-reflect: ["error", { "exceptions": ["call"] }]*/

// in addition to Reflect.apply(...):
myFunction.call(undefined, arg);
myFunction.call(null, arg);
obj.myMethod.call(obj, arg);
obj.myMethod.call(other, arg);

Reflect.defineProperty

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/*eslint prefer-reflect: "error"*/

Object.defineProperty({}, 'foo', {value: 1})

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/*eslint prefer-reflect: "error"*/

Reflect.defineProperty({}, 'foo', {value: 1})

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/*eslint prefer-reflect: ["error", { "exceptions": ["defineProperty"] }]*/

Object.defineProperty({}, 'foo', {value: 1})
Reflect.defineProperty({}, 'foo', {value: 1})

Reflect.getOwnPropertyDescriptor

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/*eslint prefer-reflect: "error"*/

Object.getOwnPropertyDescriptor({}, 'foo')

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/*eslint prefer-reflect: "error"*/

Reflect.getOwnPropertyDescriptor({}, 'foo')

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/*eslint prefer-reflect: ["error", { "exceptions": ["getOwnPropertyDescriptor"] }]*/

Object.getOwnPropertyDescriptor({}, 'foo')
Reflect.getOwnPropertyDescriptor({}, 'foo')

Reflect.getPrototypeOf

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/*eslint prefer-reflect: "error"*/

Object.getPrototypeOf({}, 'foo')

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/*eslint prefer-reflect: "error"*/

Reflect.getPrototypeOf({}, 'foo')

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/*eslint prefer-reflect: ["error", { "exceptions": ["getPrototypeOf"] }]*/

Object.getPrototypeOf({}, 'foo')
Reflect.getPrototypeOf({}, 'foo')

Reflect.setPrototypeOf

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/*eslint prefer-reflect: "error"*/

Object.setPrototypeOf({}, Object.prototype)

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/*eslint prefer-reflect: "error"*/

Reflect.setPrototypeOf({}, Object.prototype)

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/*eslint prefer-reflect: ["error", { "exceptions": ["setPrototypeOf"] }]*/

Object.setPrototypeOf({}, Object.prototype)
Reflect.setPrototypeOf({}, Object.prototype)

Reflect.isExtensible

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/*eslint prefer-reflect: "error"*/

Object.isExtensible({})

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/*eslint prefer-reflect: "error"*/

Reflect.isExtensible({})

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/*eslint prefer-reflect: ["error", { "exceptions": ["isExtensible"] }]*/

Object.isExtensible({})
Reflect.isExtensible({})

Reflect.preventExtensions

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/*eslint prefer-reflect: "error"*/

Object.preventExtensions({})

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/*eslint prefer-reflect: "error"*/

Reflect.preventExtensions({})

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/*eslint prefer-reflect: ["error", { "exceptions": ["preventExtensions"] }]*/

Object.preventExtensions({})
Reflect.preventExtensions({})

Reflect.deleteProperty

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/*eslint prefer-reflect: "error"*/

delete foo.bar; // deleting object property

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/*eslint prefer-reflect: "error"*/

delete bar; // deleting variable
Reflect.deleteProperty(foo, 'bar');

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/*eslint prefer-reflect: ["error", { "exceptions": ["delete"] }]*/

delete bar
delete foo.bar
Reflect.deleteProperty(foo, 'bar');

何时不使用

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