| 1 | import { act } from "react"; |
| 2 | |
| 3 | export function installTranscriptRaceClock(targetWindow: Window) { |
| 4 | let clockNow = 10_000; |
| 5 | let nextTimer = 1; |
| 6 | const timers = new Map<number, { dueAt: number; run: () => void }>(); |
| 7 | const originalDateNow = Date.now; |
| 8 | const originalSetTimeout = targetWindow.setTimeout; |
| 9 | const originalClearTimeout = targetWindow.clearTimeout; |
| 10 | Date.now = () => clockNow; |
| 11 | targetWindow.setTimeout = ((handler: TimerHandler, timeout = 0, ...args: unknown[]) => { |
| 12 | const id = nextTimer++; |
| 13 | const run = typeof handler === "function" |
| 14 | ? () => handler(...args) |
| 15 | : () => { throw new Error("string timer handlers are unsupported in this test"); }; |
| 16 | timers.set(id, { dueAt: clockNow + Math.max(0, timeout), run }); |
| 17 | return id; |
| 18 | }) as typeof targetWindow.setTimeout; |
| 19 | targetWindow.clearTimeout = ((id: number | undefined) => { |
| 20 | if (id !== undefined) timers.delete(id); |
| 21 | }) as typeof targetWindow.clearTimeout; |
| 22 | |
| 23 | const advanceClock = async (milliseconds: number) => { |
| 24 | await act(async () => { |
| 25 | const target = clockNow + milliseconds; |
| 26 | while (true) { |
| 27 | const next = [...timers.entries()] |
| 28 | .filter(([, timer]) => timer.dueAt <= target) |
| 29 | .sort(([leftID, left], [rightID, right]) => left.dueAt - right.dueAt || leftID - rightID)[0]; |
| 30 | if (!next) break; |
| 31 | const [id, timer] = next; |
| 32 | timers.delete(id); |
| 33 | clockNow = timer.dueAt; |
| 34 | timer.run(); |
| 35 | } |
| 36 | clockNow = target; |
| 37 | }); |
| 38 | }; |
| 39 | const restore = () => { |
| 40 | Date.now = originalDateNow; |
| 41 | targetWindow.setTimeout = originalSetTimeout; |
| 42 | targetWindow.clearTimeout = originalClearTimeout; |
| 43 | }; |
| 44 | return { advanceClock, restore }; |
| 45 | } |
| 46 |