core(tsc): update to ts 3.1 for new protocol defs #5942
Merged
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As mentioned in #5836 (comment), in order to update to the new protocol definitions and the rest of the improvements in #5836 we need to be running typescript 3.1.
Luckily the work in #5873 means that the remaining change is small, just dealing with some kind of annoying extra strictness in dom methods (e.g. handling that technically
document.head
can be null...just not in practice).