Mobx Simple Store

Mobx Simple Store (also MSS) is a wrapper around Mobx that helps the user create a reactive state tree store with an opinionated structure and setters that can read JSON objects.

Mobx Simple Store vs Mobx State Tree

As heavy users of Mobx State Tree (MST), we loved using it. The State Tree along with the types.model structure boosted our productivity a lot. One of the only problems with MST is its low performance when handling large amounts of data. These are described at https://github.com/mobxjs/mobx-state-tree/issues/1683 and https://github.com/mobxjs/mobx-state-tree/issues/440.

It was clear that those were MST problems and not Mobx specific. Because of that we created MSS to be a close alternative to MST but removed some of the features that cause those performance issues. Here is a list of differences between MSS and MST.

• MSS creates actions and views via this while MST creates them using the action binding with self.
• MSS does not have runtime type checking as MST does.
• MSS does not have snapshots or use of any reactions built into the library as MST does.
• MSS nodes don't know about parent nodes as MST does.

Examples

Basic implementation

import { toGenerator, types, createStore } from "mobx-simple-store";

const Loading = types
  .model({
    loading: types.boolean,
  })
  .actions({
    setLoading(val: boolean) {
      this.loading = val;
    },
  });

const CounterStore = types
  .compose(
    Loading,
    types.model({
      count1: types.number,
      count2: types.number,
      countArr: types.maybeNull(types.array(types.string)),
    })
  )
  .views({
    get sumCount() {
      return this.count1 + this.count2;
    },
  })
  .actions({
    incrementCount1() {
      this.count1++;
    },
  })
  .actions({
    *asyncIncrementCount() {
      this.loading = true;
      this.count1 = 5;
      yield* toGenerator(delay(3000));
      this.loading = false;
      this.count1 = 10;
      return 10;
    },
    incrementCount2() {
      this.count2++;
    },
    setDataArr(data: any) {
      this.countArr = data;
    },
  });

const useCounterStore = createStore({
  model: CounterStore,
  initialData: {
    count1: 0,
    count2: 0,
    countArr: undefined,
  },
  windowPropertyName: "counterStore",
});

const counterStore = useCounterStore();

For more examples, check packages/sandbox