TinyBase

useCreateStore

The useCreateStore hook is used to create a Store within a React application with convenient memoization.

useCreateStore(
  create: () => Store,
  createDeps?: DependencyList,
): Store
TypeDescription
create() => Store

A function for performing the creation of the Store, plus any additional steps such as adding data or listeners, and returning it.

createDeps?DependencyList

An optional array of dependencies for the create function, which, if any change, result in its rerun. This parameter defaults to an empty array.

returnsStore

A reference to the Store.

It is possible to create a Store outside of the React app with the regular createStore function and pass it in, but you may prefer to create it within the app, perhaps inside the top-level component. To defend against a new Store being created every time the app renders or re-renders, the useCreateStore hook wraps the creation in a memoization.

The useCreateStore hook is a very thin wrapper around the React useMemo hook, defaulting to an empty array for its dependencies, so that by default, the creation only occurs once.

If your create function contains other dependencies, the changing of which should cause the Store to be recreated, you can provide them in an array in the optional second parameter, just as you would for any React hook with dependencies.

Examples

This example creates an empty Store at the top level of a React application. Even though the App component is rendered twice, the Store creation only occurs once by default.

const App = () => {
  const store = useCreateStore(() => {
    console.log('Store created');
    return createStore().setTables({pets: {fido: {species: 'dog'}}});
  });
  return <span>{store.getCell('pets', 'fido', 'species')}</span>;
};

const app = document.createElement('div');
ReactDOM.render(<App />, app);
// -> 'Store created'

ReactDOM.render(<App />, app);
// No second Store creation

console.log(app.innerHTML);
// -> '<span>dog</span>'

This example creates an empty Store at the top level of a React application. The App component is rendered twice, each with a different top-level prop. The useCreateStore hook takes the fidoSpecies prop as a dependency, and so the Store is created again on the second render.

const App = ({fidoSpecies}) => {
  const store = useCreateStore(() => {
    console.log(`Store created for fido as ${fidoSpecies}`);
    return createStore().setTables({pets: {fido: {species: fidoSpecies}}});
  }, [fidoSpecies]);
  return <span>{store.getCell('pets', 'fido', 'species')}</span>;
};

const app = document.createElement('div');
ReactDOM.render(<App fidoSpecies="dog" />, app);
// -> 'Store created for fido as dog'

console.log(app.innerHTML);
// -> '<span>dog</span>'

ReactDOM.render(<App fidoSpecies="cat" />, app);
// -> 'Store created for fido as cat'

console.log(app.innerHTML);
// -> '<span>cat</span>'