tree 8485f7426e26969a9823af5a88f01e63fcb04002
parent 1e96b6c329f77a3a972a5fca34c351fa11b90782
author Nate Bosch <nbosch1@gmail.com> 1598629192 -0700
committer GitHub <noreply@github.com> 1598629192 -0700
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Migrate to null safety (#110)

- *Breaking* The `Font.merge` and `BoxEdge.merge` factory constructors
  are now static methods since a factory constructor can't return null,
  but that was the entire point of these constructors.
- Add nullable return types on methods that have a branch returning
  `null`.
- Add a lot of `?` on parameters that can't provably be non-null.
- Add a lot of `!`.
- Add overrides of `TreeNode.clone` to tighten the return type in a few
  places and allow some skipped explicit casts.
- Remove some dead code on conditional branches that never would have
  been followed, even before the migration, but weren't obvious
  statically.
- Add explicit casts.