Disallow renaming import, export, and destructured assignments to the same name (no-useless-rename)

禁止在 import 和 export 和解构赋值时将引用重命名为相同的名字 (no-useless-rename)

The --fix option on the command line can automatically fix some of the problems reported by this rule.

命令行中的 --fix 选项可以自动修复一些该规则报告的问题。

ES2015 allows for the renaming of references in import and export statements as well as destructuring assignments. This gives programmers a concise syntax for performing these operations while renaming these references:

ES2015允许在 import ，export 和结构赋值时对引用进行重命名。这给了开发者简洁的语法来执行这些操作同时对引用进行重命名

import { foo as bar } from "baz";
export { foo as bar };
let { foo: bar } = baz;

With this syntax, it is possible to rename a reference to the same name. This is a completely redundant operation, as this is the same as not renaming at all. For example, this:

有了这个语法，引用有可能被重命名成相同的名字。因为这和没有重命名是等价的，因此这种操作完全冗余。例如：

import { foo as foo } from "bar";
export { foo as foo };
let { foo: foo } = bar;

is the same as:

等价于：

import { foo } from "bar";
export { foo };
let { foo } = bar;

Rule Details

This rule disallows the renaming of import, export, and destructured assignments to the same name.

这条规则进行在 import 和 export 和解构赋值时将引用重命名为相同的名字

Options

This rule allows for more fine-grained control with the following options:

这条规则支持用下面的选项进行更细粒度的配置：

ignoreImport: When set to true, this rule does not check imports
ignoreImport: 当设置为 true，这条规则不会检查 imports
ignoreExport: When set to true, this rule does not check exports
ignoreExport: 当设置为 true，这条规则不会检查 exports
ignoreDestructuring: When set to true, this rule does not check destructuring assignments
ignoreDestructuring: 当设置为 true, 这条规则不会检查解构赋值

By default, all options are set to false:

这些选项默认都被设置为 false：

"no-useless-rename": ["error", {
    "ignoreDestructuring": false,
    "ignoreImport": false,
    "ignoreExport": false
}]

Examples of incorrect code for this rule by default:

默认配置时错误代码示例：

/*eslint no-useless-rename: "error"*/

import { foo as foo } from "bar";
export { foo as foo };
export { foo as foo } from "bar";
let { foo: foo } = bar;
let { 'foo': foo } = bar;
function foo({ bar: bar }) {}
({ foo: foo }) => {}

Examples of correct code for this rule by default:

默认配置时正确代码示例：

/*eslint no-useless-rename: "error"*/

import * as foo from "foo";
import { foo } from "bar";
import { foo as bar } from "baz";

export { foo };
export { foo as bar };
export { foo as bar } from "foo";

let { foo } = bar;
let { foo: bar } = baz;
let { [foo]: foo } = bar;

function foo({ bar }) {}
function foo({ bar: baz }) {}

({ foo }) => {}
({ foo: bar }) => {}

Examples of correct code for this rule with { ignoreImport: true }:

选项 { ignoreImport: true } 的正确代码示例：

/*eslint no-useless-rename: ["error", { ignoreImport: true }]*/

import { foo as foo } from "bar";

Examples of correct code for this rule with { ignoreExport: true }:

选项 { ignoreExport: true } 时正确代码示例：

/*eslint no-useless-rename: ["error", { ignoreExport: true }]*/

export { foo as foo };
export { foo as foo } from "bar";

Examples of correct code for this rule with { ignoreDestructuring: true }:

选项 { ignoreDestructuring: true } 时正确代码示例：

/*eslint no-useless-rename: ["error", { ignoreDestructuring: true }]*/

let { foo: foo } = bar;
function foo({ bar: bar }) {}
({ foo: foo }) => {}

When Not To Use It

You can safely disable this rule if you do not care about redundantly renaming import, export, and destructuring assignments.

如果你不关心在 import , export 和解构赋值时冗余的重命名，关闭此规则即可。

Compatibility

JSCS: disallowIdenticalDestructuringNames

Version

This rule was introduced in ESLint 2.11.0.

该规则在 ESLint 2.11.0 中被引入。