File size: 8,877 Bytes
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import { classifySessionSwitch, isStableDestination, type SessionSwitchSample } from "./session-tab-switch-metrics"
type SessionSwitchProbe = {
samples: SessionSwitchSample[]
stop: () => void
}
async function installSessionSwitchProbe(
page: Page,
input: {
destinationIDs: string[]
sourceIDs: string[]
lastID: string
requiredPartID?: string
requireBottomAnchor?: boolean
href: string
},
) {
await page.evaluate(({ destinationIDs, sourceIDs, lastID, requiredPartID, requireBottomAnchor, href }) => {
const destination = new Set(destinationIDs)
const source = new Set(sourceIDs)
const samples: SessionSwitchSample[] = []
let started: number | undefined
let running = true
const reviewLevels: Record<string, string> = {
panel: "#review-panel",
tabs: '#review-panel [data-component="tabs"]',
body: '#review-panel [data-slot="session-review-v2-body"]',
review: '#review-panel [data-component="session-review-v2"]',
preview: '#review-panel [data-slot="session-review-v2-preview"]',
scroll: '#review-panel [data-slot="session-review-v2-diff-scroll"]',
file: '#review-panel [data-component="file"][data-mode="diff"]',
}
const initialReviewNodes: Record<string, Element | null> = {}
const sample = () => {
if (!running || started === undefined) return
setTimeout(() => {
if (!running || started === undefined) return
const observedAtMs = performance.now() - started
const reviewPanel = document.querySelector<HTMLElement>("#review-panel")
const reviewFile = reviewPanel?.querySelector('[data-component="file"][data-mode="diff"]')
const initialReviewFile = initialReviewNodes.file
const replacedLevels = Object.entries(reviewLevels).flatMap(([name, selector]) => {
const initial = initialReviewNodes[name]
if (!initial) return []
const current = document.querySelector(selector)
return current && current !== initial ? [name] : []
})
const review = reviewPanel
? {
fileHost: !!reviewFile,
fileHostReplaced: !!initialReviewFile && !!reviewFile && reviewFile !== initialReviewFile,
header:
reviewPanel
.querySelector<HTMLElement>('[data-slot="session-review-v2-file-header"]')
?.textContent?.trim() ?? "",
replacedLevels,
}
: undefined
const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
element.querySelector("[data-timeline-row]"),
)
if (root) {
const view = root.getBoundingClientRect()
const visible = [...root.querySelectorAll<HTMLElement>("[data-message-id]")]
.filter((element) => {
const rect = element.getBoundingClientRect()
return rect.bottom > view.top && rect.top < view.bottom
})
.map((element) => element.dataset.messageId!)
const hasVisibleRows = [...root.querySelectorAll<HTMLElement>("[data-timeline-key]")].some((element) => {
const rect = element.getBoundingClientRect()
return rect.bottom > view.top && rect.top < view.bottom
})
const requiredPartVisible = requiredPartID
? [...root.querySelectorAll<HTMLElement>("[data-timeline-part-id]")].some((element) => {
if (element.dataset.timelinePartId !== requiredPartID) return false
const rect = element.getBoundingClientRect()
return rect.width > 0 && rect.height > 0 && rect.bottom > view.top && rect.top < view.bottom
})
: undefined
const spacer = root.querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')?.getBoundingClientRect()
samples.push({
observedAtMs,
destination: visible.filter((id) => destination.has(id)),
source: visible.filter((id) => source.has(id)),
hasVisibleRows,
last: visible.includes(lastID),
requiredPartVisible,
bottomAnchorRequired: requireBottomAnchor !== false,
bottomErrorPx: spacer ? spacer.bottom - view.bottom : undefined,
review,
})
} else {
samples.push({
observedAtMs,
destination: [],
source: [],
hasVisibleRows: false,
last: false,
requiredPartVisible: requiredPartID ? false : undefined,
bottomAnchorRequired: requireBottomAnchor !== false,
review,
})
}
requestAnimationFrame(sample)
}, 0)
}
document.addEventListener(
"click",
(event) => {
const link = event.target instanceof Element ? event.target.closest("a") : undefined
if (link?.getAttribute("href") !== href) return
started = performance.now()
for (const [name, selector] of Object.entries(reviewLevels)) {
initialReviewNodes[name] = document.querySelector(selector)
}
requestAnimationFrame(sample)
},
{ capture: true, once: true },
)
;(window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe = {
samples,
stop: () => {
running = false
},
}
}, input)
}
async function waitForStableSessionSwitch(page: Page) {
await page.waitForFunction(() => {
const samples = (window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe?.samples
if (!samples) return false
return samples.some((_, index) => {
const stable = samples.slice(index, index + 3)
return (
stable.length === 3 &&
stable.every(
(sample) =>
sample.destination.length > 0 &&
sample.source.length === 0 &&
sample.last &&
sample.requiredPartVisible !== false &&
(sample.bottomAnchorRequired === false || Math.abs(sample.bottomErrorPx ?? Infinity) <= 1),
)
)
})
})
}
async function collectSessionSwitchResult(page: Page) {
const samples = await page.evaluate(() => {
const probe = (window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe!
probe.stop()
return probe.samples
})
return classifySessionSwitch(samples)
}
export async function measureSessionSwitch(
page: Page,
input: {
destinationIDs: string[]
sourceIDs: string[]
lastID: string
requiredPartID?: string
requireBottomAnchor?: boolean
href: string
switch: () => Promise<void>
},
) {
const { switch: run, ...probe } = input
await installSessionSwitchProbe(page, probe)
try {
await run()
await waitForStableSessionSwitch(page)
return await collectSessionSwitchResult(page)
} finally {
await page.evaluate(() => {
;(window as Window & { __sessionSwitchProbe?: SessionSwitchProbe }).__sessionSwitchProbe?.stop()
})
}
}
export async function waitForStableTimeline(page: Page, lastID: string) {
const samples: Pick<SessionSwitchSample, "last" | "bottomErrorPx">[] = []
await expect
.poll(
async () => {
samples.push(
await page.evaluate(
(lastID) =>
new Promise<Pick<SessionSwitchSample, "last" | "bottomErrorPx">>((resolve) => {
requestAnimationFrame(() =>
setTimeout(() => {
const root = [...document.querySelectorAll<HTMLElement>(".scroll-view__viewport")].find((element) =>
element.querySelector("[data-timeline-row]"),
)
if (!root) {
resolve({ last: false })
return
}
const view = root.getBoundingClientRect()
const last = [...root.querySelectorAll<HTMLElement>("[data-message-id]")].some((element) => {
if (element.dataset.messageId !== lastID) return false
const rect = element.getBoundingClientRect()
return rect.bottom > view.top && rect.top < view.bottom
})
const spacer = root
.querySelector<HTMLElement>('[data-timeline-row="bottom-spacer"]')
?.getBoundingClientRect()
resolve({ last, bottomErrorPx: spacer ? spacer.bottom - view.bottom : undefined })
}, 0),
)
}),
lastID,
),
)
return isStableDestination(samples.slice(-3))
},
{ timeout: 30_000, intervals: [0] },
)
.toBe(true)
}
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