lines-around-comment

在--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。

许多风格指南在评论之前或之后需要空行。这些规则的主要目标是使评论更易于阅读并提高代码的可读性。

规则细节

此规则在评论之前和/或之后需要空行。它可以单独为block（/*）和line（//）注释启用。此规则不适用于与代码显示在同一行上的注释，并且不需要在文件的开头或结尾处出现空行。

选项

该规则有一个对象选项：

• "beforeBlockComment": true （默认）在块注释之前需要一个空行

• "afterBlockComment": true 块注释后需要一个空行

• "beforeLineComment": true 行注释前需要一个空行

• "afterLineComment": true 行注释后需要一个空行

• "allowBlockStart": true 允许评论出现在块语句的开始处

• "allowBlockEnd": true 允许注释出现在块语句的末尾

• "allowObjectStart": true 允许评论出现在对象文字的开头

• "allowObjectEnd": true 允许注释出现在对象文字的末尾

• "allowArrayStart": true 允许注释出现在数组文字的开头

• "allowArrayEnd": true 允许注释出现在数组文字的末尾

• "allowClassStart": true 允许评论出现在课程开始时

• "allowClassEnd": true 允许评论出现在课程结束时

• "applyDefaultIgnorePatterns" 启用或禁用规则忽略的默认评论模式

• "ignorePattern" 自定义模式被规则忽略

beforeBlockComment

此规则的默认代码错误代码示例{ "beforeBlockComment": true }：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true }]*/

var night = "long";
/* what a great and wonderful day */
var day = "great"

具有默认选项的此规则的正确代码示例{ "beforeBlockComment": true }：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true }]*/

var night = "long";

/* what a great and wonderful day */
var day = "great"

afterBlockComment

此规则的错误代码示例包含以下{ "afterBlockComment": true }选项：

/*eslint lines-around-comment: ["error", { "afterBlockComment": true }]*/

var night = "long";

/* what a great and wonderful day */
var day = "great"

此规则的正确代码示例包含以下{ "afterBlockComment": true }选项：

/*eslint lines-around-comment: ["error", { "afterBlockComment": true }]*/

var night = "long";

/* what a great and wonderful day */

var day = "great"

beforeLineComment

此规则的错误代码示例包含以下{ "beforeLineComment": true }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true }]*/

var night = "long";
// what a great and wonderful day
var day = "great"

此规则的正确代码示例包含以下{ "beforeLineComment": true }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true }]*/

var night = "long";

// what a great and wonderful day
var day = "great"

afterLineComment

此规则的错误代码示例包含以下{ "afterLineComment": true }选项：

/*eslint lines-around-comment: ["error", { "afterLineComment": true }]*/

var night = "long";
// what a great and wonderful day
var day = "great"

此规则的正确代码示例包含以下{ "afterLineComment": true }选项：

/*eslint lines-around-comment: ["error", { "afterLineComment": true }]*/

var night = "long";
// what a great and wonderful day

var day = "great"

allowBlockStart

此规则的正确代码示例包含以下{ "beforeLineComment": true, "allowBlockStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true, "allowBlockStart": true }]*/

function foo(){
    // what a great and wonderful day
    var day = "great"
    return day;
}

此规则的正确代码示例包含以下{ "beforeBlockComment": true, "allowBlockStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true, "allowBlockStart": true }]*/

function foo(){
    /* what a great and wonderful day */
    var day = "great"
    return day;
}

allowBlockEnd

此规则的正确代码示例包含以下{ "afterLineComment": true, "allowBlockEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterLineComment": true, "allowBlockEnd": true }]*/

function foo(){
    var day = "great"
    return day;
    // what a great and wonderful day
}

此规则的正确代码示例包含以下{ "afterBlockComment": true, "allowBlockEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterBlockComment": true, "allowBlockEnd": true }]*/

function foo(){
    var day = "great"
    return day;

    /* what a great and wonderful day */
}

allowClassStart

此规则的错误代码示例包含以下{ "beforeLineComment": true, "allowClassStart": false }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true, "allowClassStart": false }]*/

class foo {
    // what a great and wonderful day
    day() {}
};

此规则的正确代码示例包含以下{ "beforeLineComment": true, "allowClassStart": false }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true, "allowClassStart": false }]*/

class foo {

    // what a great and wonderful day
    day() {}
};

此规则的正确代码示例包含以下{ "beforeLineComment": true, "allowClassStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true, "allowClassStart": true }]*/

class foo {
    // what a great and wonderful day
    day() {}
};

此规则的错误代码示例包含以下{ "beforeBlockComment": true, "allowClassStart": false }选项：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true, "allowClassStart": false }]*/

class foo {
    /* what a great and wonderful day */
    day() {}
};

此规则的正确代码示例包含以下{ "beforeBlockComment": true, "allowClassStart": false }选项：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true, "allowClassStart": false }]*/

class foo {

    /* what a great and wonderful day */
    day() {}
};

此规则的正确代码示例包含以下{ "beforeBlockComment": true, "allowClassStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true, "allowClassStart": true }]*/

class foo {
    /* what a great and wonderful day */
    day() {}
};

allowClassEnd

此规则的正确代码示例包含以下{ "afterLineComment": true, "allowClassEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterLineComment": true, "allowClassEnd": true }]*/

class foo {
    day() {}
    // what a great and wonderful day
};

此规则的正确代码示例包含以下{ "afterBlockComment": true, "allowClassEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterBlockComment": true, "allowClassEnd": true }]*/

class foo {
    day() {}

    /* what a great and wonderful day */
};

allowObjectStart

此规则的正确代码示例包含以下{ "beforeLineComment": true, "allowObjectStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true, "allowObjectStart": true }]*/

var foo = {
    // what a great and wonderful day
    day: "great"
};

const {
    // what a great and wonderful day
    foo: someDay
} = {foo: "great"};

const {
    // what a great and wonderful day
    day
} = {day: "great"};

此规则的正确代码示例包含以下{ "beforeBlockComment": true, "allowObjectStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true, "allowObjectStart": true }]*/

var foo = {
    /* what a great and wonderful day */
    day: "great"
};

const {
    /* what a great and wonderful day */
    foo: someDay
} = {foo: "great"};

const {
    /* what a great and wonderful day */
    day
} = {day: "great"};

allowObjectEnd

此规则的正确代码示例包含以下{ "afterLineComment": true, "allowObjectEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterLineComment": true, "allowObjectEnd": true }]*/

var foo = {
    day: "great"
    // what a great and wonderful day
};

const {
    foo: someDay
    // what a great and wonderful day
} = {foo: "great"};

const {
    day
    // what a great and wonderful day
} = {day: "great"};

此规则的正确代码示例包含以下{ "afterBlockComment": true, "allowObjectEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterBlockComment": true, "allowObjectEnd": true }]*/

var foo = {
    day: "great"

    /* what a great and wonderful day */
};

const {
    foo: someDay

    /* what a great and wonderful day */
} = {foo: "great"};

const {
    day

    /* what a great and wonderful day */
} = {day: "great"};

allowArrayStart

此规则的正确代码示例包含以下{ "beforeLineComment": true, "allowArrayStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeLineComment": true, "allowArrayStart": true }]*/

var day = [
    // what a great and wonderful day
    "great",
    "wonderful"
];

const [
    // what a great and wonderful day
    someDay
] = ["great", "not great"];

此规则的正确代码示例包含以下{ "beforeBlockComment": true, "allowArrayStart": true }选项：

/*eslint lines-around-comment: ["error", { "beforeBlockComment": true, "allowArrayStart": true }]*/

var day = [
    /* what a great and wonderful day */
    "great",
    "wonderful"
];

const [
    /* what a great and wonderful day */
    someDay
] = ["great", "not great"];

allowArrayEnd

此规则的正确代码示例包含以下{ "afterLineComment": true, "allowArrayEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterLineComment": true, "allowArrayEnd": true }]*/

var day = [
    "great",
    "wonderful"
    // what a great and wonderful day
];

const [
    someDay
    // what a great and wonderful day
] = ["great", "not great"];

此规则的正确代码示例包含以下{ "afterBlockComment": true, "allowArrayEnd": true }选项：

/*eslint lines-around-comment: ["error", { "afterBlockComment": true, "allowArrayEnd": true }]*/

var day = [
    "great",
    "wonderful"

    /* what a great and wonderful day */
];

const [
    someDay

    /* what a great and wonderful day */
] = ["great", "not great"];

ignorePattern

默认情况下，这个规则忽略先从下面的话评论：eslint，jshint，jslint，istanbul，global，exported，jscs。可以提供一个替代的正则表达式。

选项的正确代码示例ignorePattern：

/*eslint lines-around-comment: ["error"]*/

foo();
/* eslint mentioned in this comment */,
bar();


/*eslint lines-around-comment: ["error", { "ignorePattern": "pragma" }] */

foo();
/* a valid comment using pragma in it */

选项的错误代码示例ignorePattern：

/*eslint lines-around-comment: ["error", { "ignorePattern": "pragma" }] */

1 + 1;
/* something else */

applyDefaultIgnorePatterns

即使ignorePattern提供默认忽略模式也会应用。如果您想省略默认模式，请将此选项设置为false。

选项的正确代码示例{ "applyDefaultIgnorePatterns": false }：

/*eslint lines-around-comment: ["error", { "ignorePattern": "pragma", applyDefaultIgnorePatterns: false }] */

foo();
/* a valid comment using pragma in it */

选项的错误代码示例{ "applyDefaultIgnorePatterns": false }：

/*eslint lines-around-comment: ["error", { "applyDefaultIgnorePatterns": false }] */

foo();
/* eslint mentioned in comment */

何时不使用它

许多人都喜欢一种比较特别的代码风格，不介意代码碰撞的评论。如果你属于这个类别，这条规则不适合你。

相关规则

• space-before-blocks

• spaced-comment

版本

这条规则是在 ESLint 0.22.0 中引入的。

资源

• Rule source

• Documentation source