Road to 4.0

[mweststrate]

Hi all!

Time to start thinking about the next major of MobX. These are some of the ideas I have around them. Global goal:

Leverage modern features in evergreen browsers to address current quirks in the MobX api

Quirks being:

1. Observable arrays not being arrays,
2. property additions not being observed
3. Maps only supporting primitive keys and Sets not being present #800

Tools to address the quirks: levering proxies #776 and native map implementations #800

Breaking changes

• observable(object) will now make all properties (including future ones) observable. To limit / specify the set of observable properties one will have to use extendObservable
• Some utilities like isArrayLike will be deprecated
• Array.move will be deprecated
• Improve some typings #818, #817

Also fix #940 if not done before

Tasks:

• [ ] Proxy arrays, kill faux array
• [ ] Proxy maps
• [ ] Proxy objects
• [ ] Introduce sets
• [ ] Update / finetune observable api
• [ ] Verify performance
• [ ] Document migration path
• [ ] Re-evaluate existing api, remove deprecated stuff, deprecate things to be removed
• [ ] Update docs, tutorials, gotcha pages
• [ ] Double check if all issues referred to in this issue are adressed
• [ ] Clearly communicate environment dependencies of 4.0, suggest 3.0 branch for projects with strict browser requirements
• [ ] Clean up the legacy exports (for default and *)
• [ ] Decompose extras namespace for better tree shaking
• [ ] Remove spy / or spy events related to object mutations [discuss]

[urugator]

I see, I thought it's @computed(options), you have a mistake in migration guide I believe, check the new API for @computed.equals(compareFn) :)

[mweststrate]

Released:

mobx@4.0.0-beta.2 mobx-utils@4.0.0-beta.2 mobx-react@5.0.0-beta.2

Which together fix some build & typescript issues :)

[mweststrate]

released mobx@4.0.0-beta.3 (fixing #1376)

[mweststrate]

Released 4.0.0!

[marvinhagemeister]

@mwestrate awesome! Congrats for the ride! Really happy with Mobx :)