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- Files in the SDK are already opted into null safety. - Files in the packages are already opted into null safety via the pubspecs. - in_sync_test.dart was opted out but required no changes to migrate. Change-Id: Ic9334824de1b22c879e962f488e1fa8021017710 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/246058 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>
Package js_shared:
This code is a compile time dependency of dart2js and DDC. It is imported as
a package: import by both compilers.
There is an exact copy in the SDK of the libraries in the
pkg/js_shared/lib/synced sub-directory.
Those libraries are imported as dart: imports by the dart2js and DDC runtime
libraries.
Important: all code under pkg/js_shared/lib/synced must be kept in sync with
the runtime (in sdk/lib/_internal/js_shared/lib/synced) at all times. The
test/in_sync_test.dart test verifies this.