mobx-state-tree | Full-featured reactive state management | State Container library
kandi X-RAY | mobx-state-tree Summary
kandi X-RAY | mobx-state-tree Summary
Technically speaking, mobx-state-tree (also known as MST) is a state container system built on MobX, a functional reactive state library.
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mobx-state-tree Examples and Code Snippets
Community Discussions
Trending Discussions on mobx-state-tree
QUESTION
I install npm i @types/react-native-snap-carousel and version is 3.8.5 My package.json is
...ANSWER
Answered 2021-Dec-17 at 08:10I only install
QUESTION
getting in valid hook error in a re write of a clients app... (upgrading code)
mobx 6.3.8 mobx react 7.2.1 and mobx-state-tree 5.0.5 React 17.0.1 RN 0.64.3
i feel like the error is here. i googled the code line for use stores and it led me to the deprecated site... i dont know where to find new handling in the https://mobx.js.org/react-integration.html site... what would this be called?
...ANSWER
Answered 2022-Jan-07 at 19:52From that error message:
Hooks can only be called inside of the body of a function component.
You are not calling a hook from inside the body of a function component. So you are breaking the rules of hooks.
According the rules of hooks you can only call a hook from the top level of a react function component. If you are not inside a functional component, then you cannot use a react hook*.
From the docs:
Don’t call Hooks inside loops, conditions, or nested functions. Instead, always use Hooks at the top level of your React function, before any early returns. By following this rule, you ensure that Hooks are called in the same order each time a component renders. That’s what allows React to correctly preserve the state of Hooks between multiple
useState
anduseEffect
calls.
That means you need to call useStores
from within a functional component.
Something like:
QUESTION
I have an application built with NextJs (and React) and mobx-state-tree (but could be context or redux) as a package manager. All the stores are created and handled in an npm package called SMK (state management kit) that I created to make the sub-stores reusable in my mobile and web application.
How it works:
- Create the sub-store with
models
,actions
andviews
on the SMK and export it as a module. - Add the SMK using
yarn add @my-repo/smk
. - Create the root store in my app and import the sub-store from SMK as a child of the root store.
- Build and start the app and everything is working well.
But I need to run and publish the SMK locally to make it easier development. The solution I used to use is yalc.
Using yalc and running it locally this is the process:
- In the SMK, runs
yarn start
. (This will donodemon --ignore src/index.ts -e js,ts,tsx,json --watch src/ --exec yalc push --scripts
) - In the APP, runs
yalc add @my-repo/smk
. (This will add a dependency like"@my-repo/smk": "file:.yalc/@my-repo/smk"
). - In the APP, runs
yarn build
and thenyarn start
And voila! Everything is working perfect, any change I did locally on my SMK is working perfectly on the APP.
BUT, when I run yarn dev
that do next dev
as default of NextJs it doesn't work.
Error explanation: As I only added the setTestingState
and testingState
locally, it's saying that it doesn't exist.
Possible reason: The fast refresh is not refreshing the cache properly.
I've tried:
- Add
// @refresh reset
to force it, but didn't work. - Stop and start the application.
- Build, start and then run dev. (works for build and not for dev)
What is the solution/workaround to solve this issue with yarn dev
and yalc
?
ANSWER
Answered 2021-Dec-20 at 17:33Looks like it's a bug on NextJs and we can find some devs asking to NextJs to allow us to disable the Fast Refresh, and looks like they don't care or just don't have the intention to change it.
So, I found a third-party library, next-remote-watch, that is solving this issue for me. Basically, is an alternative script to use instead of next dev
and it will do a quick and simply build and active a watcher.
At package.json
use
QUESTION
3.5 and Expo version 43
we are moving an existng code file over to use in expo our user store model... having a hard time reaching the .actions items and no idea how to research this.
example code of where we are trying to use the action in
...ANSWER
Answered 2021-Dec-10 at 18:37Adding my comment that helped as an answer:
You're using a context in
QUESTION
I am experiencing difficulty writing tests for react-native typescript screen using instructions from the URL below https://react-native-async-storage.github.io/async-storage/docs/advanced/jest/
I keep getting the below error
FAIL app/screens/login/login-screen.test.tsx ● Test suite failed to run
...ANSWER
Answered 2021-Dec-06 at 15:23Based on your package.json dependencies you dont have the @react-native-async-storage
dependency, you have @react-native-community/async-storage
, which is the old organisation namespace.
Try doing
QUESTION
I have a problem with changing the value in my state. I have
...ANSWER
Answered 2021-Sep-29 at 14:11From mobx-state-tree
document:
By default, nodes can only be modified by one of their actions, or by actions higher up in the tree.
You put your tags
in a global state which is an immutable object. so avoid changing your global state via inline codes in your component.
you can define propper actions
and dispatch them for those changes.
for more information about the actions in mobx-state-tree
look at the documentation.
QUESTION
I'm learning mobX-state-tree, and in their tutorial code, i see this
...ANSWER
Answered 2021-Sep-09 at 03:36You should post what are you trying to do, but i think you need to understand the basics of javascript object and how react works.
You can use any name as a prop. But if you choose prop={any object}. You have to use it inside your app observer as:
QUESTION
I am trying to set the vehicles array to the array that I am getting from the store. However, it seems that Typescript is complaining about something.
My model looks like this:
...ANSWER
Answered 2021-Jul-31 at 18:44It seems your types for useState
are incorrect. It should be:
QUESTION
it's the first time I use react-intl
with Mobx state tree
.
Basically I have two buttons in the header (it
and en
) that on click set the current language saved in a Mobx State Tree variable.
Something like this.
In my state:
...ANSWER
Answered 2021-May-31 at 11:31Lots of ways to solve it, for example I think you can wrap IntlProvider
in Observer
(docs) component to make it reactive:
QUESTION
I'm really stuck with the problem. I have a nested menu. After click on the first menu level second level items shows up. After click on one of the children nothing happens. Looks like the observer don't work for deep levels items. I don't know if the "late" type could be a problem. Everything is described in the code: https://codesandbox.io/s/mobx-state-tree-recursive-deep-menu-p7eqj
Thanks in advance
...ANSWER
Answered 2021-May-12 at 11:42The problem is that when you are using your recursive TreeItem
component it is not actually observer
. You wrapping it in observer
only when exporting, but TreeItem
inside TreeItem
is regular component, not observer
so it doesn't react to anything.
Basically you just need to move observer
decorator:
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