noRedundantUseStrict

JavaScript (and super languages)

摘要

¥Summary

规则生效日期：v1.0.0

¥Rule available since: v1.0.0
诊断类别：lint/suspicious/noRedundantUseStrict

¥Diagnostic Category: lint/suspicious/noRedundantUseStrict
此规则为推荐规则，默认启用。

¥This rule is recommended, which means is enabled by default.
此规则包含 safe 修复程序。

¥This rule has a safe fix.
此规则的默认严重级别为 warning。

¥The default severity of this rule is warning.

如何配置

¥How to configure

1
{
2
  "linter": {
3
    "rules": {
4
      "suspicious": {
5
        "noRedundantUseStrict": "error"
6
      }
7
    }
8
  }
9
}

描述

¥Description

防止有多余的 "use strict"。

¥Prevents from having redundant "use strict".

在 .mjs 文件中，或在 package.json 将库定义为模块的项目内的 .js 文件中，不需要指令 "use strict"：

¥The directive "use strict" isn’t needed in .mjs files, or in .js files inside projects where the package.json defines library as module:

1
{
2
   "type": "module"
3
}

相反，.cjs 文件被视为 “scripts”，指令 "use strict" 被接受和建议。

¥Instead, .cjs files are considered “scripts” and the directive "use strict" is accepted and advised.

示例

¥Examples

无效

¥Invalid

1
"use strict";
2
function foo() {
3
   "use strict";
4
}

code-block.cjs:3:3 lint/suspicious/noRedundantUseStrict  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Redundant use strict directive.
  
    1 │ “use strict”;
    2 │ function foo() {
  > 3 │  	“use strict”;
      │  	^^^^^^^^^^^^^
    4 │ }
    5 │ 
  
  ℹ This outer use strict directive already enables strict mode.
  
  > 1 │ “use strict”;
      │ ^^^^^^^^^^^^^
    2 │ function foo() {
    3 │  	“use strict”;
  
  ℹ Safe fix: Remove the redundant use strict directive.
  
    3 │ ·→ “use·strict”;
      │    -------------

1
"use strict";
2
"use strict";
3

4
function foo() {
5

6
}

code-block.cjs:2:1 lint/suspicious/noRedundantUseStrict  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Redundant use strict directive.
  
    1 │ “use strict”;
  > 2 │ “use strict”;
      │ ^^^^^^^^^^^^^
    3 │ 
    4 │ function foo() {
  
  ℹ This outer use strict directive already enables strict mode.
  
  > 1 │ “use strict”;
      │ ^^^^^^^^^^^^^
    2 │ “use strict”;
    3 │ 
  
  ℹ Safe fix: Remove the redundant use strict directive.
  
    2 │ “use·strict”;
      │ -------------

1
function foo() {
2
"use strict";
3
"use strict";
4
}

code-block.cjs:3:1 lint/suspicious/noRedundantUseStrict  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Redundant use strict directive.
  
    1 │ function foo() {
    2 │ “use strict”;
  > 3 │ “use strict”;
      │ ^^^^^^^^^^^^^
    4 │ }
    5 │ 
  
  ℹ This outer use strict directive already enables strict mode.
  
    1 │ function foo() {
  > 2 │ “use strict”;
      │ ^^^^^^^^^^^^^
    3 │ “use strict”;
    4 │ }
  
  ℹ Safe fix: Remove the redundant use strict directive.
  
    3 │ “use·strict”;
      │ -------------

1
class C1 {
2
  test() {
3
    "use strict";
4
  }
5
}

code-block.cjs:3:3 lint/suspicious/noRedundantUseStrict  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Redundant use strict directive.
  
    1 │ class C1 {
    2 │ 	test() {
  > 3 │ 		“use strict”;
      │ 		^^^^^^^^^^^^^
    4 │ 	}
    5 │ }
  
  ℹ All parts of a class’s body are already in strict mode.
  
  > 1 │ class C1 {
      │ ^^^^^^^^^^
  > 2 │ 	test() {
  > 3 │ 		“use strict”;
  > 4 │ 	}
  > 5 │ }
      │ ^
    6 │ 
  
  ℹ Safe fix: Remove the redundant use strict directive.
  
    3 │ → → “use·strict”;
      │     -------------

1
const C2 = class {
2
  test() {
3
    "use strict";
4
  }
5
};

code-block.cjs:3:3 lint/suspicious/noRedundantUseStrict  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Redundant use strict directive.
  
    1 │ const C2 = class {
    2 │ 	test() {
  > 3 │ 		“use strict”;
      │ 		^^^^^^^^^^^^^
    4 │ 	}
    5 │ };
  
  ℹ All parts of a class’s body are already in strict mode.
  
  > 1 │ const C2 = class {
      │            ^^^^^^^
  > 2 │ 	test() {
  > 3 │ 		“use strict”;
  > 4 │ 	}
  > 5 │ };
      │ ^
    6 │ 
  
  ℹ Safe fix: Remove the redundant use strict directive.
  
    3 │ → → “use·strict”;
      │     -------------

有效

¥Valid

1
function foo() {
2

3
}

1
 function foo() {
2
    "use strict";
3
}
4
function bar() {
5
    "use strict";
6
}

noRedundantUseStrict

摘要

如何配置

描述

示例

无效

有效

相关链接