The web implementation of shared_preferences.
Please set your constraint to shared_preferences_web: '>=0.1.y+x <2.0.0'
The plugin has reached a stable API, we guarantee that version 1.0.0 will be backward compatible with 0.1.y+z. Please use shared_preferences_web: '>=0.1.y+x <2.0.0' as your dependency constraint to allow a smoother ecosystem migration. For more details see: https://github.com/flutter/flutter/wiki/Package-migration-to-1.0.0
To use this plugin in your Flutter Web app, simply add it as a dependency in your pubspec.yaml alongside the base shared_preferences plugin.
(This is only temporary: in the future we hope to make this package an “endorsed” implementation of shared_preferences, so that it is automatically included in your Flutter Web app when you depend on package:shared_preferences.)
This is what the above means to your pubspec.yaml:
... dependencies: ... shared_preferences: ^0.5.4+8 shared_preferences_web: ^0.1.0 ...
Once you have the shared_preferences_web dependency in your pubspec, you should be able to use package:shared_preferences as normal.