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I don't find anything about my question here on MDC or the ECMAscript specifications. Probably somebody knows a more 'hacky' way to solve this. I'm calling "use strict" on every javascript file in my environment. All my files start like this (function(win, doc, undef) { "use strict"; // code & functions }(window, window.document)); Now, I have a custom function which handles errors. That functions uses the .caller property to provide a context stack trace . Looks like this: var chain = (function() { var _parent = _error, _ret = ''; while( _parent.caller ) { _ret += ' -> ' + _parent.caller.name; _parent = _parent.caller; } return _ret; }()); But of course, in strict mode .caller is a non-deletable prop which throws when retrieved. So my question is, is anybody aware of way to disable strict more "function-wise" ? "use strict"; is inherited by all functions after it was called. Now we have the possibilty to just use strict mode in specific functions by just calling "use strict"; at the top of those, but is there a way to achieve the opposite ?

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