Jslint Is Suddenly Reporting: Use the Function Form of “Use Strict”

When working with JavaScript, you may come across an error message from JSLint stating: “Use the function form of ‘use strict’”. This error occurs when the “use strict” directive is not placed within a function scope.

The “use strict” directive is used to enable strict mode in JavaScript, which helps catch common coding mistakes and enforces stricter rules for writing JavaScript code. It is typically placed at the beginning of a JavaScript file or within a function scope.

To resolve this error, you need to ensure that the “use strict” directive is placed within a function scope. Here are two possible solutions:

Solution 1: Wrap the code in an Immediately Invoked Function Expression (IIFE)

(function() {
  "use strict";
  
  // Your JavaScript code here
})();

In this solution, the code is wrapped in an IIFE, which creates a new function scope. By placing the “use strict” directive within the IIFE, it is now within a function scope and the error will no longer be reported by JSLint.

Solution 2: Define a named function and place the code inside it

function myFunction() {
  "use strict";
  
  // Your JavaScript code here
}

myFunction();

In this solution, a named function called “myFunction” is defined. The “use strict” directive is placed within the function scope, and the code is then executed by calling the function.

By using either of these solutions, you can ensure that the “use strict” directive is placed within a function scope, resolving the error reported by JSLint.

Remember, it is important to always use the “use strict” directive in your JavaScript code to enforce stricter rules and catch potential errors.