Comment #3 on issue 3718 by [email protected]: CallSite.getTypeName()
throws TypeError in strict mode
https://code.google.com/p/v8/issues/detail?id=3718
The docs at https://code.google.com/p/v8-wiki/wiki/JavaScriptStackTraceApi
only mention that getFunction() and getThis() will return undefined in
strict mode. As for the other CallSite functions including getTypeName(),
shouldn't they continue to work in strict mode?
In any case, if the intention is for getTypeName() to not work in strict
mode, then there is still a bug, because getTypeName() *only* throws an
exception if the function is called without a receiver. If the function is
called with a receiver--that is, if you changed the invocation f() to
f.call({}), then getTypeName() works just fine, returning the
string 'Object'.
Furthermore, if the intention is for getTypeName() to not work in strict
mode, why does it throw a TypeError instead of just returning undefined,
which is the behavior for getFunction() and getThis() in strict mode?
As for the cause of this bug, it is simply a missing definedness check on
the receiver argument of GetTypeName here:
https://github.com/v8/v8/blob/3.26.31.6/src/messages.js#L1113
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