Update TransformStream options getters to check for undefined
This is essentially copied from https://github.com/WebKit/WebKit/pull/7021
J
Jarred Sumner committed
bdbc0f23e7235b1b1c9e24d251613f3b477a8abd
Parent: ba6908a
This is essentially copied from https://github.com/WebKit/WebKit/pull/7021