Is there a way to return the function that invoked the current function? Function.caller will only work for non-strict mode applications.

I want to be able to use this functionality for production environment, therefore I need strict mode to be turned on.

Expected return: function itself or the name of function.

function a() {
 b()
}

function b() {
 console.log(b.caller)
}

Function.caller will throw an error when used in strict mode:

Uncaught TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them

Is there a way to return the function that invoked the current function? Function.caller will only work for non-strict mode applications.

I want to be able to use this functionality for production environment, therefore I need strict mode to be turned on.

Expected return: function itself or the name of function.

function a() {
 b()
}

function b() {
 console.log(b.caller)
}

Function.caller will throw an error when used in strict mode:

Uncaught TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them

• javascript
• strict
• backtrace

• Check the following answer: stackoverflow./a/29572569/6080889 – dRoyson Commented Aug 28, 2019 at 5:28
• 2 Out of curiosity, what are you using it for? – Brad Commented Aug 28, 2019 at 6:18
• @Royson the suggested answer error.stack which is non-standard – Code Maniac Commented Aug 28, 2019 at 6:42
• @CodeManiac So do you know any "standard" solution for this? Without having to pass the caller name in a parameter each time? – Bart Hofland Commented Aug 28, 2019 at 7:08
• You should have written "production-safe version", with the hyphen. This is the rule for pound adjectives (words that are bined together to describe another, following word). – GeneC Commented Aug 3, 2020 at 21:52

2 Answers 2

One possible way is use Console.trace

function a() {
 b()
}

function b() {
 console.trace()
}

a()

Check the browser console to see output

There does not seem to be a flexible way of doing that natively in JavaScript.

When using a non-standard solution might be acceptable, you could look into the Error.prototype.stack property. You could use the method in p.s.w.g's answer, as Royson already suggested in a ment.

For a more robust solution for production use, I think you should consider using an external package (like stacktrace.js).