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import { describe, expect, test } from "bun:test"
import { createRoot } from "solid-js"
import { createStore } from "solid-js/store"
import { makePersisted, type SyncStorage } from "@solid-primitives/storage"
import { createScrollPersistence } from "./layout-scroll"
describe("createScrollPersistence", () => {
test("debounces persisted scroll writes", async () => {
const key = "layout-scroll.test"
const data = new Map<string, string>()
const writes: string[] = []
const stats = { flushes: 0 }
const storage = {
getItem: (k: string) => data.get(k) ?? null,
setItem: (k: string, v: string) => {
data.set(k, v)
if (k === key) writes.push(v)
},
removeItem: (k: string) => {
data.delete(k)
},
} as SyncStorage
await new Promise<void>((resolve, reject) => {
createRoot((dispose) => {
const [raw, setRaw] = createStore({
sessionView: {} as Record<string, { scroll: Record<string, { x: number; y: number }> }>,
})
const [store, setStore] = makePersisted([raw, setRaw], { name: key, storage })
const scroll = createScrollPersistence({
debounceMs: 30,
getSnapshot: (sessionKey) => store.sessionView[sessionKey]?.scroll,
onFlush: (sessionKey, next) => {
stats.flushes += 1
const current = store.sessionView[sessionKey]
if (!current) {
setStore("sessionView", sessionKey, { scroll: next })
return
}
setStore("sessionView", sessionKey, "scroll", (prev) => ({ ...(prev ?? {}), ...next }))
},
})
const run = async () => {
await new Promise((r) => setTimeout(r, 0))
writes.length = 0
for (const i of Array.from({ length: 100 }, (_, n) => n)) {
scroll.setScroll("session", "review", { x: 0, y: i })
}
await new Promise((r) => setTimeout(r, 120))
expect(stats.flushes).toBeGreaterThanOrEqual(1)
expect(writes.length).toBeGreaterThanOrEqual(1)
expect(writes.length).toBeLessThanOrEqual(2)
}
void run()
.then(resolve)
.catch(reject)
.finally(() => {
scroll.dispose()
dispose()
})
})
})
})
})
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