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Eslint参考手册

规则 | Rules

no-useless-rename

--fix命令行上的选项可以自动修复一些被这条规则反映的问题。

ES2015允许重命名导入和导出语句中的引用以及解构赋值。这为程序员提供了一个简洁的语法,用于在重命名这些引用时执行这些操作:

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

使用这种语法,可以将引用重命名为相同的名称。这是一个完全冗余的操作,因为这与完全不重命名相同。例如,这个:

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

是相同的:

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

规则细节

此规则不允许将导入、导出和解构分配重命名为相同的名称。

选项

此规则允许使用以下选项进行更细粒度的控制:

  • ignoreImport:设置为时true,此规则不检查导入
  • ignoreExport:设置为时true,此规则不检查导出
  • ignoreDestructuring:设置为时true,此规则不检查解构分配

默认情况下,所有选项都设置为false

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

默认情况下此规则的代码不正确的示例:

/*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 }) => {}

默认情况下此规则的正确代码示例:

/*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 }) => {}

此规则的正确代码示例{ ignoreImport: true }

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

import { foo as foo } from "bar";

此规则的正确代码示例{ ignoreExport: true }

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

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

此规则的正确代码示例{ ignoreDestructuring: true }

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

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

何时不使用它

如果您不关心冗余重命名导入、导出和解构赋值,则可以安全地禁用此规则。

兼容性

  • JSCS:disallowIdenticalDestructuringNames版本此规则在 ESLint 2.11.0.Resources中引入
  • 规则资源
  • 文档资源

规则 | Rules相关

1.accessor-pairs
2.array-bracket-newline
3.array-bracket-spacing
4.array-callback-return
5.array-element-newline
6.arrow-body-style
7.arrow-parens
8.arrow-spacing
9.block-scoped-var
10.block-spacing
11.brace-style
12.callback-return
13.camelcase
14.capitalized-comments
15.class-methods-use-this
16.comma-dangle
17.comma-spacing
18.comma-style
19.complexity
20.computed-property-spacing
21.consistent-return
22.consistent-this
23.constructor-super
24.curly
25.default-case
26.dot-location
27.dot-notation
28.eol-last
29.eqeqeq
30.for-direction
31.func-call-spacing
32.func-name-matching
33.func-names
34.func-style
35.function-paren-newline
36.generator-star
37.generator-star-spacing
38.getter-return
39.global-require
40.global-strict
41.guard-for-in
42.handle-callback-err
43.id-blacklist
44.id-length
45.id-match
46.implicit-arrow-linebreak
47.indent
48.indent-legacy
49.init-declarations
50.jsx-quotes
51.key-spacing
52.keyword-spacing
53.line-comment-position
54.linebreak-style
55.lines-around-comment
56.lines-around-directive
57.lines-between-class-members
58.max-depth
59.max-len
60.max-lines
61.max-nested-callbacks
62.max-params
63.max-statements
64.max-statements-per-line
65.multiline-comment-style
66.multiline-ternary
67.new-cap
68.new-parens
69.newline-after-var
70.newline-before-return
71.newline-per-chained-call
72.no-alert
73.no-array-constructor
74.no-arrow-condition
75.no-await-in-loop
76.no-bitwise
77.no-buffer-constructor
78.no-caller
79.no-case-declarations
80.no-catch-shadow
81.no-class-assign
82.no-comma-dangle
83.no-compare-neg-zero
84.no-cond-assign
85.no-confusing-arrow
86.no-console
87.no-const-assign
88.no-constant-condition
89.no-continue
90.no-control-regex
91.no-debugger
92.no-delete-var
93.no-div-regex
94.no-dupe-args
95.no-dupe-class-members
96.no-dupe-keys
97.no-duplicate-case
98.no-duplicate-imports
99.no-else-return
100.no-empty
Eslint

ESLint 是一个代码规范和错误检查工具,有以下几个特性。所有东西都是可以插拔的。你可以调用任意的 rule api 或者 formatter api 去打包或者定义 rule or formatter。任意的 rule 都是独立的。没有特定的 coding style,你可以自己配置。

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源码 https://github.com/eslint/eslint
发布版本 4.12.0

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1.指南 | Guide
2.规则 | Rules