A SyntaxError was encountered because functions in strict mode code must be declared either at the top level or directly within another function

Question

A SyntaxError was encountered because functions in strict mode code must be declared either at the top level or directly within another function

Hey there, I'm encountering a strange issue with my project. Everything runs smoothly when I run it in Developer mode using `grunt server`. However, when I try to run it in production mode with `grunt build`, I encounter an error:

Uncaught SyntaxError: In strict mode code, functions can only be declared at top level or immediately within another function

Does anyone have any insights on what might be causing this? Any help would be greatly appreciated!

P.S. I didn't include the actual code snippet here as the JavaScript is spread across multiple files, but you can find the project link here.

javascript angularjs strict

Answer 1

Answer №1

As per the error message, functions can only be defined at the top level or directly within another function.

You should not place a function declaration inside any other block like an if-statement or for-loop.

For instance:

'use strict';

function some() {

    function okay() {
    }

    let x = 1;

    function no_problem() {
    }

    if (x == 1) {

        function BOOM() {   // <- incorrect!
        }
    }
}

Answer 2

As per the error message, functions can only be defined at the top level or directly within another function.

You should not place a function declaration inside any other block like an if-statement or for-loop.

For instance:

'use strict';

function some() {

    function okay() {
    }

    let x = 1;

    function no_problem() {
    }

    if (x == 1) {

        function BOOM() {   // <- incorrect!
        }
    }
}

Answer 3

Answer №2

One idea mentioned earlier is to remove the comment from the 'use strict'; section, or alternatively, update the syntax of your function.

Rather than

function funcName (param) { }

consider using

funcName = function(param) {};

Answer 4

One idea mentioned earlier is to remove the comment from the 'use strict'; section, or alternatively, update the syntax of your function.

Rather than

function funcName (param) { }

consider using

funcName = function(param) {};

Answer 5

Answer №3

To solve the issue, I removed the 'use strict' statement that was placed above the jQuery in the final minified script. Another solution could be to switch to a jQuery version that does not have the strict mode bug.

UPDATE: It turns out that the problem was caused by a jQuery minification error in version 1.11. An easy way to fix this is to locate your Grunt file and comment out the line

banner: "'use strict';\n"

Answer 6

To solve the issue, I removed the 'use strict' statement that was placed above the jQuery in the final minified script. Another solution could be to switch to a jQuery version that does not have the strict mode bug.

UPDATE: It turns out that the problem was caused by a jQuery minification error in version 1.11. An easy way to fix this is to locate your Grunt file and comment out the line

banner: "'use strict';\n"

Answer 7

Answer №4

Aside from the correct solutions, it is possible that this could also be a bug specific to FireFox.

We encountered this error message on one user's machine. In the JavaScript file, there was a "use strict" line positioned after the method that triggered the error (although this should not have been impacted).

This issue arose in FireFox Version 45.9.0 (and potentially in older versions as well). Updating FireFox to the latest version at that time (52.4) resolved the problem.

Answer 8

Aside from the correct solutions, it is possible that this could also be a bug specific to FireFox.

We encountered this error message on one user's machine. In the JavaScript file, there was a "use strict" line positioned after the method that triggered the error (although this should not have been impacted).

This issue arose in FireFox Version 45.9.0 (and potentially in older versions as well). Updating FireFox to the latest version at that time (52.4) resolved the problem.

Answer 9

Answer №5

Curiously, my issue stemmed from the placement of the { on a new line, even though I was returning an object. To resolve it,

I switched

"use strict";
var funcName1 = function(){
    /* some code*/
    return
    { // note this bracket
        funcName2:function(){/* some code*/},
    };
}

to

"use strict";
var funcName1 = function(){
    /* some code*/
    return { // to this, same line
        funcName2:function(){/* some code*/},
    };
}

Answer 10

Curiously, my issue stemmed from the placement of the { on a new line, even though I was returning an object. To resolve it,

I switched

"use strict";
var funcName1 = function(){
    /* some code*/
    return
    { // note this bracket
        funcName2:function(){/* some code*/},
    };
}

to

"use strict";
var funcName1 = function(){
    /* some code*/
    return { // to this, same line
        funcName2:function(){/* some code*/},
    };
}

A SyntaxError was encountered because functions in strict mode code must be declared either at the top level or directly within another function

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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