Enable null safety by default in templates #78619
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@munificent can you check to see if my changes are ideomatic? |
goderbauer
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Look like some tool tests are failing.
packages/flutter_tools/templates/module/common/lib/main.dart.tmpl
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| static Future<String> get platformVersion async { | ||
| final String version = await _channel.invokeMethod('getPlatformVersion'); | ||
| static Future<String?> get platformVersion async { |
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Should this actually be allowed to return null? Or is null always an error case (e.g. plugin wasn't available).
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If I'm reading this correctly, then MethodChannel can never return null, but OptionalMethodChannel can.
https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/services/platform_channel.dart#L330
I think we know in MethodChannel that T is never null (as per missingOk: false), so we could change MethodChannel.invokeMethod to return Future<T> not Future<T?>?
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This seems to work:
diff --git a/packages/flutter/lib/src/services/platform_channel.dart b/packages/flutter/lib/src/services/platform_channel.dart
index c9bad0e210..bd07c68829 100644
--- a/packages/flutter/lib/src/services/platform_channel.dart
+++ b/packages/flutter/lib/src/services/platform_channel.dart
@@ -327,8 +327,8 @@ class MethodChannel {
/// * <https://api.flutter.dev/javadoc/io/flutter/plugin/common/MethodCall.html>
/// for how to access method call arguments on Android.
@optionalTypeArgs
- Future<T?> invokeMethod<T>(String method, [ dynamic arguments ]) {
- return _invokeMethod<T>(method, missingOk: false, arguments: arguments);
+ Future<T> invokeMethod<T>(String method, [ dynamic arguments ]) {
+ return _invokeMethod<T>(method, missingOk: false, arguments: arguments) as T;
}Who know this code best and can comment?
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Looks like changing the interface requires a larger refactoring...
munificent
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Dart changes look idiomatic to me.
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CI is now passing (the red X is the Flutter Dashboard being red). |
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| static Future<String> get platformVersion async { | ||
| final String version = await _channel.invokeMethod('getPlatformVersion'); | ||
| static Future<String?> get platformVersion async { |
There was a problem hiding this comment.
Looks like changing the interface requires a larger refactoring...
Co-authored-by: Michael Goderbauer <goderbauer@google.com>
Enable Dart null safety (https://dart.dev/null-safety) by default in all
flutter createtemplates.