By leveraging TypeScript's AST type guards, function parameter assumptions and casting can be removed. Many of these cases caused errors when enabling TypeScript's strict option. This is preliminary work to support enabling full TypeScript strict mode within the project.
Curtrently, when a node of kind is found, we recursivly continue to look up it's child nodes until the end of the AST. This ends up returing other nodes which we were not looking for as typically we are looking for the first level of children of the specified kind.
By default now, we stop recursivly looking for child nodes of kind when we encounter one.
Closes#15117
`findNodes` will continue looking for arrays recursively unless we specify that we specify that we want only the first array.
Routes array can contain nested arrays such as when specifying guards.
Fixes#15016
At the moment, at least a single whitespace is required as otherwise the following error `Cannot read property '0' of null ` will be thrown
Fixes#12950
This should clean up the code a bit.
Note: at first I added the no-useless-cast rule, but after getting frustrated
with it (as it has many false positive), I decided to remove the rule but some
useless casts were removed so I let those in the PR.
