qortal-ui/core/src/stateAwait.js

/**
 * Simple helper function so that I can do `await stateAwait(state => state.something === true)` or `await stateAwait(state => state.name === 'myName')`
 */
import { store } from './store'

let subscriptions = []

store.subscribe(() => {
	const state = store.getState()
	subscriptions = subscriptions.filter(fn => fn(state))
})

export const stateAwait = fn => {
	return new Promise((resolve, reject) => {
		// Check immediately...then if not true store it
		if (fn(store.getState())) resolve()

		subscriptions.push(state => {
			if (fn(state)) {
				resolve()
				return true
			}

			return false
		})
	})
}