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createStoreFactory.js
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58 lines (47 loc) · 1.73 KB
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import { createPatchAndUnpatchFromMutations } from '../util/patches.js'
import { isFunction } from '../util/is.js'
export default function createStoreFactory(applyPatchFunction) {
return function createStore(state) {
const listeners = new Map()
function subscribe(listener, filter) {
listeners.set(listener, filter)
return () => unsubscribe(listener) // This has become a kind of standard
}
function unsubscribe(listener) {
listeners.delete(listener)
}
function applyPatch(patch_or_fn) {
const applied = applyPatchFunction(api.state, patch_or_fn)
const outputs = Array.from(listeners.entries()).map(
([listener, filter]) => {
const mutations = isFunction(filter)
? applied.mutations.filter(filter)
: applied.mutations.slice(0)
const { patch, unpatch } =
createPatchAndUnpatchFromMutations(
mutations,
applied.patch
)
return {
listener,
patch,
unpatch,
mutations,
}
}
)
outputs.mutations = applied.mutations
outputs.patch = applied.patch
outputs.unpatch = applied.unpatch
return outputs
}
const api = {
state,
listeners,
subscribe,
unsubscribe,
applyPatch,
}
return api
}
}