unknown_platform

The platform '{0}' is not a recognized platform.

The analyzer produces this diagnostic when an unknown platform name is used as a key in the platforms map. To learn more about specifying your package's supported platforms, check out the documentation on platform declarations.

The following pubspec.yaml produces this diagnostic because the platform browser is unknown.

name: example
platforms:
  browser:

If you can rely on automatic platform detection, then omit the top-level platforms key.

name: example

If you need to manually specify the list of supported platforms, then write the platforms field as a map with known platform names as keys.

name: example
platforms:
  # These are the known platforms
  android:
  ios:
  linux:
  macos:
  web:
  windows: