How to check if 'debugger;' keyword exists?

Question

Sometimes some developers forgot to remove debugger; in javascript code, and it produce javascript error on IE. How can you check (like for the console: if(wi

Answer 1

Maybe the safest approach is to have a global include file for all your projects that stubs out the debugger if it doesn't exist:

if (typeof debugger == 'undefined') {
    window.debugger = null;
}

That way calls to debugger just become a reference to null. which is harmless. Seems like a better approach than expecting forgetful developers to wrap each debugger call in an if statement.

The same approach works for console.log, etc.

EDIT: As AndrewF points out, debugger is actually a keyword, not a global, so this won't work. The same effect can be achieved using the following without throwing an error:

window['debugger'] = null;