noRedundantUseStrict
诊断类别：lint/suspicious/noRedundantUseStrict
¥Diagnostic Category: lint/suspicious/noRedundantUseStrict
自从：v1.0.0
¥Since: v1.0.0
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:
{ "type": "module"}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.
请注意，领先的琐事，例如冗余 "use strict" 之前的注释或换行符也将被删除。这样注释指令就不会被转移到错误的地方。
¥Note that the leading trivia, e.g., comments or newlines preceding
the redundant "use strict" will also be removed. So that comment
directives won’t be transferred to a wrong place.
¥Examples
¥Invalid
"use strict";function foo() { "use strict";}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.
1 1 │ “use strict”;
2 2 │ function foo() {
3 │ - ·→ “use·strict”;
4 3 │ }
5 4 │
"use strict";"use strict";
function foo() {
}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.
1 1 │ “use strict”;
2 │ - “use·strict”;
3 2 │
4 3 │ function foo() {
function foo() {"use strict";"use strict";}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.
1 1 │ function foo() {
2 2 │ “use strict”;
3 │ - “use·strict”;
4 3 │ }
5 4 │
class C1 { test() { "use strict"; }}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.
1 1 │ class C1 {
2 2 │ test() {
3 │ - → → “use·strict”;
4 3 │ }
5 4 │ }
const C2 = class { test() { "use strict"; }};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.
1 1 │ const C2 = class {
2 2 │ test() {
3 │ - → → “use·strict”;
4 3 │ }
5 4 │ };
¥Valid
function foo() {
} function foo() { "use strict";}function bar() { "use strict";}¥Related links