@openmrs/esm-state

openmrs-esm-state

An OpenMRS Microfrontend.

What is this?

openmrs-esm-state is an in-browser javascript module that provides functions for managing OpenMRS state using Unistore.

It also provides a global Unistore store called app.

How do I use it?

import { createGlobalStore } from '@openmrs/esm-state';

export interface BooksStore {
  books: Array<string>;
}

createGlobalStore("books", {
  books: [],
});

import { getGlobalStore } from '@openmrs/esm-state';

const booksStore = getGlobalStore("books");
console.log(booksStore.getState());
booksStore.subscribe(books => console.log(books));
booksStore.setState({ books: ["Pathologies of Power"]});

import { getAppState } from '@openmrs/esm-state';

console.log(getAppState().getState());

In React:

import React, { useEffect } from 'react';
import { getGlobalStore } from '@openmrs/esm-state';

function BookShelf() {
  useEffect(() => {
    function update(state) {
      console.log(state);
    }
    const store = getGlobalStore("books");
    // Use `getState` to run `update` on the current state.
    update(store.getState());
    // Use `subscribe` to run `update` on all future state updates.
    // It returns an `unsubscribe` function. Return that function
    // in `useEffect` so that it runs when the component unmounts.
    return store.subscribe(update);
  }, [])
}

Also see connect and Provider.

See the Unistore docs for more information about stores.

Contributing / Development

Instructions for local development

API

The following functions are exported from the @openmrs/esm-state module:

createGlobalStore

createGlobalStore<TState>(name: string, initialState: TState): Store<TState>

Creates a store.

Arguments

1. name (required): A name by which the store can be looked up later. Must be unique across the entire application.
2. initialState (required): An object which will be the initial state of the store.

Return value

The newly created store.

getGlobalStore

getGlobalStore<TState = any>(name: string, fallbackState?: TState): Store<TState>

Returns the existing store named name, or creates a new store named name if none exists.

Arguments

1. name (required): The name of the store to look up.
2. fallbackState (optional): The initial value of the new store if no store named name exists.

Return value

The found or newly created store.

getAppState

Returns the store named app.