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import { BroadcastChannel } from 'broadcast-channel'
import type { BroadcastChannelOptions } from 'broadcast-channel'
import type { QueryClient } from '@tanstack/query-core'
interface BroadcastQueryClientOptions {
queryClient: QueryClient
broadcastChannel?: string
options?: BroadcastChannelOptions
}
export function broadcastQueryClient({
queryClient,
broadcastChannel = 'tanstack-query',
options,
}: BroadcastQueryClientOptions): () => void {
let transaction = false
const tx = (cb: () => void) => {
transaction = true
cb()
transaction = false
}
const channel = new BroadcastChannel(broadcastChannel, {
webWorkerSupport: false,
...options,
})
const queryCache = queryClient.getQueryCache()
const unsubscribe = queryClient.getQueryCache().subscribe((queryEvent) => {
if (transaction) {
return
}
const {
query: { queryHash, queryKey, state, observers },
} = queryEvent
if (queryEvent.type === 'updated' && queryEvent.action.type === 'success') {
channel.postMessage({
type: 'updated',
queryHash,
queryKey,
state,
})
}
if (queryEvent.type === 'removed' && observers.length > 0) {
channel.postMessage({
type: 'removed',
queryHash,
queryKey,
})
}
if (queryEvent.type === 'added') {
channel.postMessage({
type: 'added',
queryHash,
queryKey,
})
}
})
channel.onmessage = (action) => {
if (!action?.type) {
return
}
tx(() => {
const { type, queryHash, queryKey, state } = action
const query = queryCache.get(queryHash)
if (type === 'updated') {
if (query) {
query.setState(state)
return
}
queryCache.build(
queryClient,
{
queryKey,
queryHash,
},
state,
)
} else if (type === 'removed') {
if (query) {
queryCache.remove(query)
}
} else if (type === 'added') {
if (query) {
query.setState(state)
return
}
queryCache.build(
queryClient,
{
queryKey,
queryHash,
},
state,
)
}
})
}
return () => {
unsubscribe()
channel.close()
}
}
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