no-extra-strict

Disallows strict mode directives when already in strict mode.

::: important This rule was removed in ESLint v1.0.0 and replaced by the strict rule. The "global" or "function" options in the new rule are similar to the removed rule. :::

The "use strict"; directive applies to the scope in which it appears and all inner scopes contained within that scope. Therefore, using the "use strict"; directive in one of these inner scopes is unnecessary.

"use strict";

(function () {
    "use strict";
    var foo = true;
}());

Rule Details

This rule is aimed at preventing unnecessary "use strict"; directives. As such, it will warn when it encounters a "use strict"; directive when already in strict mode.

Example of incorrect code for this rule:

::: incorrect

"use strict";

(function () {
    "use strict";
    var foo = true;
}());

:::

Examples of correct code for this rule:

::: correct

"use strict";

(function () {
    var foo = true;
}());

:::

::: correct

(function () {
    "use strict";
    var foo = true;
}());

:::