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Eslint参考手册

规则 | Rules

implicit-arrow-linebreak

--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。

一个箭头函数体可以包含一个隐式返回,而不是一个块体。对隐式返回的表达式执行一致的位置可能很有用。

规则细节

此规则旨在为包含隐式返回的箭头函数强制实施一致的位置。

另见:

  • brace-style 这会为块体的箭头函数强制实施此行为。选项此规则接受字符串选项:
  • "beside" (默认)在箭头函数体之前不允许换行。
  • "below" 在箭头函数体之前需要一个换行符。

此规则的默认代码错误代码示例"beside"

/* eslint implicit-arrow-linebreak: ["error", "beside"] */

(foo) =>
  bar;

(foo) =>
  (bar);

(foo) =>
  bar =>
    baz;

(foo) =>
(
  bar()
);

具有默认选项的此规则的正确代码示例"beside"

/* eslint implicit-arrow-linebreak: ["error", "beside"] */

(foo) => bar;

(foo) => (bar);

(foo) => bar => baz;

(foo) => (
  bar()
);

// functions with block bodies allowed with this rule using any style
// to enforce a consistent location for this case, see the rule: `brace-style`
(foo) => {
  return bar();
}

(foo) =>
{
  return bar();
}

此规则的错误代码示例包含以下"below"选项:

/* eslint implicit-arrow-linebreak: ["error", "below"] */

(foo) => bar;

(foo) => (bar);

(foo) => bar => baz;

此规则的正确代码示例包含以下"below"选项:

/* eslint implicit-arrow-linebreak: ["error", "below"] */


(foo) =>
  bar;

(foo) =>
  (bar);

(foo) =>
  bar =>
    baz;

何时不使用它

如果您不关心隐式返回的箭头函数表达式的一致位置,则不应打开此规则。

如果您正在使用该"always"选项,您也可以禁用此规则arrow-body-style,因为这将禁止在箭头函数中使用隐式返回。

版本

该规则在 ESLint 4.12.0中引入。

资源

  • Rule source
  • Documentation source

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.indent
47.indent-legacy
48.init-declarations
49.jsx-quotes
50.key-spacing
51.keyword-spacing
52.line-comment-position
53.linebreak-style
54.lines-around-comment
55.lines-around-directive
56.lines-between-class-members
57.max-depth
58.max-len
59.max-lines
60.max-nested-callbacks
61.max-params
62.max-statements
63.max-statements-per-line
64.multiline-comment-style
65.multiline-ternary
66.new-cap
67.new-parens
68.newline-after-var
69.newline-before-return
70.newline-per-chained-call
71.no-alert
72.no-array-constructor
73.no-arrow-condition
74.no-await-in-loop
75.no-bitwise
76.no-buffer-constructor
77.no-caller
78.no-case-declarations
79.no-catch-shadow
80.no-class-assign
81.no-comma-dangle
82.no-compare-neg-zero
83.no-cond-assign
84.no-confusing-arrow
85.no-console
86.no-const-assign
87.no-constant-condition
88.no-continue
89.no-control-regex
90.no-debugger
91.no-delete-var
92.no-div-regex
93.no-dupe-args
94.no-dupe-class-members
95.no-dupe-keys
96.no-duplicate-case
97.no-duplicate-imports
98.no-else-return
99.no-empty
100.no-empty-character-class
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。

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

Eslint目录

1.指南 | Guide
2.规则 | Rules