lines-around-directive

此规则在 ESLint v4.0.0 中已弃用，并被 padding-line-between-statements 规则取代。

指令在 JavaScript 中用于向执行环境指示脚本希望选择加入诸如 "strict mode" 之类的功能。指令在文件或功能块顶部的 指示序言 中组合在一起，并应用于它们发生的范围。

// Strict mode is invoked for the entire script
"use strict";

var foo;

function bar() {
  var baz;
}

var foo;

function bar() {
  // Strict mode is only invoked within this function
  "use strict";

  var baz;
}

规则详情

此规则要求或禁止指令序言周围的空白换行符。此规则不强制执行有关各个指令之间的空白换行符的任何约定。此外，它不需要在指令序言之前使用空白换行符，除非它们前面有注释。如果这是您想要强制执行的样式，请使用 padded-blocks 规则。

选项

该规则有一个选项。它可以是字符串或对象：

• "always"（默认）在指令周围强制使用空白换行符。
• "never" 不允许在指令周围出现空白换行符。

n1WFN/RrllrZChIOyS4pUQ==

{
  "before": "always" or "never"
  "after": "always" or "never",
}

always

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/* eslint lines-around-directive: ["error", "always"] */

/* Top of file */
"use strict";
var foo;

/* Top of file */
// comment
"use strict";
"use asm";
var foo;

function foo() {
  "use strict";
  "use asm";
  var bar;
}

function foo() {
  // comment
  "use strict";
  var bar;
}

5nEv4RCYCaBiSjFxJ4F/mKpeHlEIrnzbcqjXOckHJ1BfWqE5nzuNHhp5glzX4UAfCadSKulj2RmmZJMOk1cyb5bLx+vIqzR6ie39IF3MWi8=

/* eslint lines-around-directive: ["error", "always"] */

/* Top of file */
"use strict";

var foo;

/* Top of file */
// comment

"use strict";
"use asm";

var foo;

function foo() {
  "use strict";
  "use asm";

  var bar;
}

function foo() {
  // comment

  "use strict";

  var bar;
}

never

5nEv4RCYCaBiSjFxJ4F/mCwtS62WYVf8Z3bTN0V8XnhtvTkeQjr06WS/jwr4MFgTlY/4wZUvk/MeZS6zp4z3JTWT0aSYW+CzBIMGIVe5Dm4=

/* eslint lines-around-directive: ["error", "never"] */

/* Top of file */

"use strict";

var foo;

/* Top of file */
// comment

"use strict";
"use asm";

var foo;

function foo() {
  "use strict";
  "use asm";

  var bar;
}

function foo() {
  // comment

  "use strict";

  var bar;
}

5nEv4RCYCaBiSjFxJ4F/mCwtS62WYVf8Z3bTN0V8Xng2VcIX0zXLVJuKLwV+9IjYF/o37BrrvFCp16+0aw4kI1UXI6hM+nKNGuj36GsSlgM=

/* eslint lines-around-directive: ["error", "never"] */

/* Top of file */
"use strict";
var foo;

/* Top of file */
// comment
"use strict";
"use asm";
var foo;

function foo() {
  "use strict";
  "use asm";
  var bar;
}

function foo() {
  // comment
  "use strict";
  var bar;
}

before & after

5nEv4RCYCaBiSjFxJ4F/mE/QUTr/0IAOUkRSGusG2i5Q2/9bBofavrR8n+Ou0WF+rVQ8x4vjJD3Fl72YB8Dh8gVoffg4Nn4zlReC06BuGhQPvCTKB4CIiqdaM115aQ7ulAdPKQR50J26xFggyrn5kg==

/* eslint lines-around-directive: ["error", { "before": "never", "after": "always" }] */

/* Top of file */

"use strict";
var foo;

/* Top of file */
// comment

"use strict";
"use asm";
var foo;

function foo() {
  "use strict";
  "use asm";
  var bar;
}

function foo() {
  // comment

  "use strict";
  var bar;
}

5nEv4RCYCaBiSjFxJ4F/mE/QUTr/0IAOUkRSGusG2i5Q2/9bBofavrR8n+Ou0WF+rVQ8x4vjJD3Fl72YB8Dh8gOoeKAjwUXBYLSapr1BI3fDHOsvLFFjvqdWjDNaf4FpfrUQAcLyctfYGxgCyZJsbg==

/* eslint lines-around-directive: ["error", { "before": "never", "after": "always" }] */

/* Top of file */
"use strict";

var foo;

/* Top of file */
// comment
"use strict";
"use asm";

var foo;

function foo() {
  "use strict";
  "use asm";

  var bar;
}

function foo() {
  // comment
  "use strict";

  var bar;
}

5nEv4RCYCaBiSjFxJ4F/mE/QUTr/0IAOUkRSGusG2i7/O5WLEMg4sbXWupU4bWbQQmDtLusikgP4nse6cv2b0WTRXOLsj1+TBGTt8Mvw/k016S3EsU14yP9lNwKzazsWafI1uEVdVSD7zOYa5jq68A==

/* eslint lines-around-directive: ["error", { "before": "always", "after": "never" }] */

/* Top of file */
"use strict";

var foo;

/* Top of file */
// comment
"use strict";
"use asm";

var foo;

function foo() {
  "use strict";
  "use asm";

  var bar;
}

function foo() {
  // comment
  "use strict";

  var bar;
}

5nEv4RCYCaBiSjFxJ4F/mE/QUTr/0IAOUkRSGusG2i7/O5WLEMg4sbXWupU4bWbQQmDtLusikgP4nse6cv2b0eQiy4xsD5WlW8lRV1qvcrVthriw2iU6GhyjmzmoFLYrdmM/fDTeoBYa4gOPWeWoSg==

/* eslint lines-around-directive: ["error", { "before": "always", "after": "never" }] */

/* Top of file */
"use strict";
var foo;

/* Top of file */
// comment

"use strict";
"use asm";
var foo;

function foo() {
  "use strict";
  "use asm";
  var bar;
}

function foo() {
  // comment

  "use strict";
  var bar;
}

何时不使用

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兼容性

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