fix(tsc): add .at() types manually to tsc, update to tsc v4.3.5 #11443
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Fixes: #11441
This manually adds the types for
.at()
types to arrays and strings. It is a bit "hacky", but essentially the same way we add"dom.asynciterable"
to TypeScript.Something we should revert once in a released version of TypeScript (but will likely just overwrite when it is finally included).
Added a simply js_unit test which validates that it should pass type checking.
Also updated to the latest release version of TypeScript (4.3.2 -> 4.3.5).