Important: An intentional effort is being made during migration to not
modify runtime behavior. This implies that there will be several
assertions, non-null assertions, and @ts-expect-error. This philosophy
applies only to migrating old code to TypeScript strict, not to writing
new code. For a more detailed justification for this reasoning, see
#11840 (comment).
In this PR, instead of following the approach of migrating a subset of
files, I'm migrating all files by disabling specific rules. The first
commits are named after the rule being disabled.
With this PR, the migration of the payload package is complete 🚀
53f8838830