In attempting to retrieve the arguments.callee property in the following basic function, I encountered an error preventing me from doing so.
function foo(a = 50, b) {
console.log(arguments.callee);
}
foo(10, 50);Why is this issue occurring? It appears that the function is executing in strict mode, but how is this possible given that I did not specify the 'use strict'; statement?
This test is being conducted on Google Chrome.
When utilizing advanced (modern, ES6+) syntax in your function declaration, an arguments object is automatically generated akin to strict mode. However, the function itself is not strictly enforced - allowing the use of a with statement. Nevertheless, the arguments object is no longer compatible with pre-ES5 code.
Refer to the note on FunctionDeclarationInstantiation:
A mapped argument object is only available for non-strict functions lacking a rest parameter, default parameter values, or destructured parameters.
In addition to no longer containing a .callee, it does not reflect changes made to parameter variables either. The deprecation of arguments.callee occurred with ES5, yet backward compatibility requires opting into modern syntax, such as utilizing strict mode or complex parameter declarations.
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