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47 lines
956 B
47 lines
956 B
2 years ago
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import packageJson from '../package.json'
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/**
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* Default store that keeps state in a simple object.
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*/
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class DefaultStore {
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static VERSION = packageJson.version
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constructor () {
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this.state = {}
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this.callbacks = [] // TODO: use a Set instead, make it a private prop
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}
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getState () {
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return this.state
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}
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setState (patch) {
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const prevState = { ...this.state }
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const nextState = { ...this.state, ...patch }
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this.state = nextState
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this.#publish(prevState, nextState, patch)
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}
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subscribe (listener) {
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this.callbacks.push(listener)
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return () => {
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// Remove the listener.
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this.callbacks.splice(
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this.callbacks.indexOf(listener),
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1,
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)
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}
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}
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#publish (...args) {
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this.callbacks.forEach((listener) => {
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listener(...args)
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})
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}
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}
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// TODO: export the class instead in the next major.
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export default function defaultStore () {
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return new DefaultStore()
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}
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