feat: make Equatable `abstract mixin class`

[utamori]

Status

READY

Breaking Changes

NO

Description

Make Equatable class an abstract mixin class so that it can be used as a mixin

Related PRs

no

Todos

• [x] Tests
• [x] Documentation
• [x] Examples

Steps to Test or Reproduce

Outline the steps to test or reproduce the PR here.

dart test

Impact to Remaining Code Base

This PR will affect:

• Probably not.

[felangel]

This change is still a breaking change and I don't think it's worth it especially considering I'm planning to make the next major version of equatable use macros instead so you'd always just annotate your class with @Equatable and that's it (no more props 🎉)

@Equatable()
class Person {
  const Person({required this.name});
  final String name;
}

See also https://github.com/felangel/data_class which will be built on top of the equatable macro so you could go a few steps further:

@Data()
class Person {
  final String name;
}

[felangel]

Closing for now based on my above comment, thanks so much for the contribution though -- I really appreciate it!