13.5 kBSource Map (JSON)View Raw
1{"version":3,"names":["createMemoryHistory","index","items","pending","interrupt","forEach","it","cb","history","id","window","state","findIndex","item","get","backIndex","path","i","push","nanoid","slice","length","pushState","replace","replaceState","go","n","nextIndex","lastItemIndex","Promise","resolve","reject","done","interrupted","clearTimeout","timer","Error","title","document","ref","setTimeout","splice","onPopState","currentIndex","Math","max","last","pop","removeEventListener","addEventListener","listen","listener"],"sources":["createMemoryHistory.tsx"],"sourcesContent":["import type { NavigationState } from '@react-navigation/core';\nimport { nanoid } from 'nanoid/non-secure';\n\ntype HistoryRecord = {\n // Unique identifier for this record to match it with window.history.state\n id: string;\n // Navigation state object for the history entry\n state: NavigationState;\n // Path of the history entry\n path: string;\n};\n\nexport default function createMemoryHistory() {\n let index = 0;\n let items: HistoryRecord[] = [];\n\n // Pending callbacks for `history.go(n)`\n // We might modify the callback stored if it was interrupted, so we have a ref to identify it\n const pending: { ref: unknown; cb: (interrupted?: boolean) => void }[] = [];\n\n const interrupt = () => {\n // If another history operation was performed we need to interrupt existing ones\n // This makes sure that calls such as `history.replace` after `history.go` don't happen\n // Since otherwise it won't be correct if something else has changed\n pending.forEach((it) => {\n const cb = it.cb;\n it.cb = () => cb(true);\n });\n };\n\n const history = {\n get index(): number {\n // We store an id in the state instead of an index\n // Index could get out of sync with in-memory values if page reloads\n const id = window.history.state?.id;\n\n if (id) {\n const index = items.findIndex((item) => item.id === id);\n\n return index > -1 ? index : 0;\n }\n\n return 0;\n },\n\n get(index: number) {\n return items[index];\n },\n\n backIndex({ path }: { path: string }) {\n // We need to find the index from the element before current to get closest path to go back to\n for (let i = index - 1; i >= 0; i--) {\n const item = items[i];\n\n if (item.path === path) {\n return i;\n }\n }\n\n return -1;\n },\n\n push({ path, state }: { path: string; state: NavigationState }) {\n interrupt();\n\n const id = nanoid();\n\n // When a new entry is pushed, all the existing entries after index will be inaccessible\n // So we remove any existing entries after the current index to clean them up\n items = items.slice(0, index + 1);\n\n items.push({ path, state, id });\n index = items.length - 1;\n\n // We pass empty string for title because it's ignored in all browsers except safari\n // We don't store state object in history.state because:\n // - browsers have limits on how big it can be, and we don't control the size\n // - while not recommended, there could be non-serializable data in state\n window.history.pushState({ id }, '', path);\n },\n\n replace({ path, state }: { path: string; state: NavigationState }) {\n interrupt();\n\n const id = window.history.state?.id ?? nanoid();\n\n if (!items.length || items.findIndex((item) => item.id === id) < 0) {\n // There are two scenarios for creating an array with only one history record:\n // - When loaded id not found in the items array, this function by default will replace\n // the first item. We need to keep only the new updated object, otherwise it will break\n // the page when navigating forward in history.\n // - This is the first time any state modifications are done\n // So we need to push the entry as there's nothing to replace\n items = [{ path, state, id }];\n index = 0;\n } else {\n items[index] = { path, state, id };\n }\n\n window.history.replaceState({ id }, '', path);\n },\n\n // `history.go(n)` is asynchronous, there are couple of things to keep in mind:\n // - it won't do anything if we can't go `n` steps, the `popstate` event won't fire.\n // - each `history.go(n)` call will trigger a separate `popstate` event with correct location.\n // - the `popstate` event fires before the next frame after calling `history.go(n)`.\n // This method differs from `history.go(n)` in the sense that it'll go back as many steps it can.\n go(n: number) {\n interrupt();\n\n // To guard against unexpected navigation out of the app we will assume that browser history is only as deep as the length of our memory\n // history. If we don't have an item to navigate to then update our index and navigate as far as we can without taking the user out of the app.\n const nextIndex = index + n;\n const lastItemIndex = items.length - 1;\n if (n < 0 && !items[nextIndex]) {\n // Attempted to navigate beyond the first index. Negating the current index will align the browser history with the first item.\n n = -index;\n index = 0;\n } else if (n > 0 && nextIndex > lastItemIndex) {\n // Attempted to navigate past the last index. Calculate how many indices away from the last index and go there.\n n = lastItemIndex - index;\n index = lastItemIndex;\n } else {\n index = nextIndex;\n }\n\n if (n === 0) {\n return;\n }\n\n // When we call `history.go`, `popstate` will fire when there's history to go back to\n // So we need to somehow handle following cases:\n // - There's history to go back, `history.go` is called, and `popstate` fires\n // - `history.go` is called multiple times, we need to resolve on respective `popstate`\n // - No history to go back, but `history.go` was called, browser has no API to detect it\n return new Promise<void>((resolve, reject) => {\n const done = (interrupted?: boolean) => {\n clearTimeout(timer);\n\n if (interrupted) {\n reject(new Error('History was changed during navigation.'));\n return;\n }\n\n // There seems to be a bug in Chrome regarding updating the title\n // If we set a title just before calling `history.go`, the title gets lost\n // However the value of `document.title` is still what we set it to\n // It's just not displayed in the tab bar\n // To update the tab bar, we need to reset the title to something else first (e.g. '')\n // And set the title to what it was before so it gets applied\n // It won't work without setting it to empty string coz otherwise title isn't changing\n // Which means that the browser won't do anything after setting the title\n const { title } = window.document;\n\n window.document.title = '';\n window.document.title = title;\n\n resolve();\n };\n\n pending.push({ ref: done, cb: done });\n\n // If navigation didn't happen within 100ms, assume that it won't happen\n // This may not be accurate, but hopefully it won't take so much time\n // In Chrome, navigation seems to happen instantly in next microtask\n // But on Firefox, it seems to take much longer, around 50ms from our testing\n // We're using a hacky timeout since there doesn't seem to be way to know for sure\n const timer = setTimeout(() => {\n const index = pending.findIndex((it) => it.ref === done);\n\n if (index > -1) {\n pending[index].cb();\n pending.splice(index, 1);\n }\n }, 100);\n\n const onPopState = () => {\n const id = window.history.state?.id;\n const currentIndex = items.findIndex((item) => item.id === id);\n\n // Fix createMemoryHistory.index variable's value\n // as it may go out of sync when navigating in the browser.\n index = Math.max(currentIndex, 0);\n\n const last = pending.pop();\n\n window.removeEventListener('popstate', onPopState);\n last?.cb();\n };\n\n window.addEventListener('popstate', onPopState);\n window.history.go(n);\n });\n },\n\n // The `popstate` event is triggered when history changes, except `pushState` and `replaceState`\n // If we call `history.go(n)` ourselves, we don't want it to trigger the listener\n // Here we normalize it so that only external changes (e.g. user pressing back/forward) trigger the listener\n listen(listener: () => void) {\n const onPopState = () => {\n if (pending.length) {\n 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