resolvePackage abstract method
Resolves the source for package:[pkg]/[libPath], or null if this
provider can't serve it.
Implementation
FutureOr<PackageSource?> resolvePackage(String pkg, String libPath);
Resolves the source for package:[pkg]/[libPath], or null if this
provider can't serve it.
FutureOr<PackageSource?> resolvePackage(String pkg, String libPath);