An issue about redefining TypeError

Version

chakra-9e2f198

Test case

TypeError.prototype.toString = function() {
    return Error;
};
var a = 1;
a();

Execution steps

./ChakraCore/out/Release/ch testcase.js

Output

Expected behavior

TypeError: a is not a function

Description

In the above test case, we redefine TypeError, but there is an exception in the redefined function (line 2). When executing the code, since a is not a function, TypeError will be thrown in line 5. Other engines seem to ignore the exception when redefining TypeError (line 2) when executing, and throw a TypeError exception normally, but chakra didn’t . This seems to be incorrect.

[rhuanjl]

So my conclusion is chakracore functions correctly on this but ch’s behaviour is unhelpful We could update ch to output something here which may make testing some fringe issues easier.

[YiWen-y]

I understand. Thanks for your reply.