The cross-platform OS detection is in package:platform/host.dart, in the HostPlatform class.
The native-only platform inspection in package:platform/native.dart in the NativePlatform class.
There are also package:platform/host_test.dart, and package:platform/native_test.dart, which provides a mock for each of the platform classes, MockHostPlatform and MockNativePlatform.
Existing code can keep importing package:platform/platform.dart, which exports the host.dart library, but also type-aliases for native-capable platforms to match the existing Platform, FakePlatform and LocalPlatform names. Those legacy names will eventually be deprecated.
The cross-platform OS detection is in
package:platform/host.dart, in theHostPlatformclass. The native-only platform inspection inpackage:platform/native.dartin theNativePlatformclass.There are also
package:platform/host_test.dart, andpackage:platform/native_test.dart, which provides a mock for each of the platform classes,MockHostPlatformandMockNativePlatform.Existing code can keep importing
package:platform/platform.dart, which exports thehost.dartlibrary, but also type-aliases for native-capable platforms to match the existingPlatform,FakePlatformandLocalPlatformnames. Those legacy names will eventually be deprecated.