非常教程

Eslint参考手册

规则 | Rules

complexity

循环复杂度测量程序源代码中线性独立路径的数量。该规则允许设置圈复杂度阈值。

function a(x) {
    if (true) {
        return x; // 1st path
    } else if (false) {
        return x+1; // 2nd path
    } else {
        return 4; // 3rd path
    }
}

规则细节

规则旨在通过限制程序中允许的圈复杂度来降低代码复杂性。因此,它会在圈复杂度超过配置的阈值(默认值20)时发出警告。

不正确代码的示例最多为2:

/*eslint complexity: ["error", 2]*/

function a(x) {
    if (true) {
        return x;
    } else if (false) {
        return x+1;
    } else {
        return 4; // 3rd path
    }
}

正确代码的例子最多为2:

/*eslint complexity: ["error", 2]*/

function a(x) {
    if (true) {
        return x;
    } else {
        return 4;
    }
}

选项

或者,您可以指定一个max对象属性:

"complexity": ["error", 2]

相当于

"complexity": ["error", { "max": 2 }]

推荐使用maximum对象属性已弃用。请改用该属性max

何时不使用它

如果您无法确定适合您代码的复杂性限制,则最好禁用此规则。

进一步阅读

  • Cyclomatic Complexity
  • Complexity Analysis of JavaScript Code
  • More about Complexity in JavaScript
  • About Complexity
  • Discussion about Complexity in ESLint and more links

相关规则

  • max-depth
  • max-len
  • max-nested-callbacks
  • max-params
  • max-statements

版本

规则在ESLint 0.0.9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.computed-property-spacing
20.consistent-return
21.consistent-this
22.constructor-super
23.curly
24.default-case
25.dot-location
26.dot-notation
27.eol-last
28.eqeqeq
29.for-direction
30.func-call-spacing
31.func-name-matching
32.func-names
33.func-style
34.function-paren-newline
35.generator-star
36.generator-star-spacing
37.getter-return
38.global-require
39.global-strict
40.guard-for-in
41.handle-callback-err
42.id-blacklist
43.id-length
44.id-match
45.implicit-arrow-linebreak
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