Issue
When i run the tests of my application i get this exception:
NoSuchMethodError: Attempted to use type 'SimplePipe' as a function. Since types do not define a method 'call', this is not possible. Did you intend to call the SimplePipe constructor and forget the 'new' operator?
I conclude from this error message that my project is actually not using Dart 2.0 but Dart 1.0.
The sdk is set to >=2.0.0-dev.53.0 <2.0.0 in pubspec.yaml, though.
A friend of mine is getting this this error message when running the same tests under the same conditions on his PC. He already tried running pub get.
Dart 2.0.0-dev.54.0.flutter-46ab040e58 is incompatible with your dependencies' SDK constraints. Please run "pub get" again
pubspec.yaml:
name: timecoder_common
description: A Dart Libary containin all the shared logic
version: 0.0.1
environment:
sdk: '>=2.0.0-dev.53.0 <2.0.0'
dependencies:
uuid: "^0.5.3"
json_annotation: "^0.2.3"
http: "^0.11.3"
rxdart: "^0.16.6"
test: "^0.12.34"
dev_dependencies:
build_runner: "^0.8.0"
json_serializable: "^0.5.0"
Solution
The Dart 2.0 SDK does not enable this by default (yet).
For Flutter, you will need to be on the latest SDK:
In this blog post, we’ll take a deeper look at the specific improvements we’ve made in Beta 3 itself.
For the command-line VM, as mentioned in the comments, you must opt-in:
dart --preview-dart-2 bin/main.dart
Answered By – matanlurey
Answer Checked By – Senaida (FlutterFixes Volunteer)