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mobx-keystone-yjs

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Yjs bindings for mobx-keystone

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var __defProp = Object.defineProperty; var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value; var __publicField = (obj, key, value) => __defNormalProp(obj, typeof key !== "symbol" ? key + "" : key, value); import { createAtom, reaction, observe, computed, action, remove } from "mobx"; import { createContext, Model, tProp, types, frozen, getParentToChildPath, onSnapshot, model, frozenKey, modelTypeKey, DeepChangeType, modelSnapshotOutWithMetadata, resolvePath, runUnprotected, isModel, getSnapshot, getSnapshotModelId, isFrozenSnapshot, fromSnapshot, onGlobalDeepChange, onDeepChange, isTreeNode } from "mobx-keystone"; import * as Y from "yjs"; class MobxKeystoneYjsError extends Error { constructor(msg) { super(msg); Object.setPrototypeOf(this, MobxKeystoneYjsError.prototype); } } function failure(msg) { return new MobxKeystoneYjsError(msg); } const yjsCollectionAtoms = /* @__PURE__ */ new WeakMap(); const getYjsCollectionAtom = (yjsCollection) => { return yjsCollectionAtoms.get(yjsCollection); }; const getOrCreateYjsCollectionAtom = (yjsCollection) => { let atom = yjsCollectionAtoms.get(yjsCollection); if (!atom) { atom = createAtom(`yjsCollectionAtom`); yjsCollectionAtoms.set(yjsCollection, atom); } return atom; }; function isYjsValueDeleted(yjsValue) { var _a, _b; if (yjsValue instanceof Y.AbstractType) { return !!((_a = yjsValue._item) == null ? void 0 : _a.deleted) || !!((_b = yjsValue.doc) == null ? void 0 : _b.isDestroyed); } return false; } function resolveYjsPath(yjsObject, path) { let currentYjsObject = yjsObject; let i = -1; for (const pathPart of path) { i++; if (currentYjsObject instanceof Y.Text) { return currentYjsObject; } if (currentYjsObject instanceof Y.Map) { getOrCreateYjsCollectionAtom(currentYjsObject).reportObserved(); const key = String(pathPart); currentYjsObject = currentYjsObject.get(key); } else if (currentYjsObject instanceof Y.Array) { getOrCreateYjsCollectionAtom(currentYjsObject).reportObserved(); const key = Number(pathPart); currentYjsObject = currentYjsObject.get(key); } else { throw failure( `Y.Map or Y.Array was expected at path ${JSON.stringify( path.slice(0, i) )} in order to resolve path ${JSON.stringify(path)}, but got ${currentYjsObject} instead` ); } } return currentYjsObject; } const yjsBindingContext = createContext(void 0); var __defProp2 = Object.defineProperty; var __getOwnPropDesc = Object.getOwnPropertyDescriptor; var __decorateClass = (decorators, target, key, kind) => { var result = kind > 1 ? void 0 : kind ? __getOwnPropDesc(target, key) : target; for (var i = decorators.length - 1, decorator; i >= 0; i--) if (decorator = decorators[i]) result = (kind ? decorator(target, key, result) : decorator(result)) || result; if (kind && result) __defProp2(target, key, result); return result; }; const deltaListType = types.array(types.frozen(types.unchecked())); const yjsTextModelId = "mobx-keystone-yjs/YjsTextModel"; let YjsTextModel = class extends Model({ deltaList: tProp(deltaListType, () => []) }) { constructor() { super(...arguments); /** * Atom that gets changed when the associated Y.js text changes. */ __publicField(this, "yjsTextChangedAtom", createAtom("yjsTextChangedAtom")); } /** * Helper function to create a YjsTextModel instance with a simple text. */ static withText(text) { return new DecoratedYjsTextModel({ deltaList: [ frozen([ { insert: text } ]) ] }); } get _yjsObjectPath() { const ctx = yjsBindingContext.get(this); if ((ctx == null ? void 0 : ctx.boundObject) == null) { throw failure( "the YjsTextModel instance must be part of a bound object before it can be accessed" ); } const path = getParentToChildPath(ctx.boundObject, this); if (!path) { throw failure("a path from the bound object to the YjsTextModel instance is not available"); } return path; } get _yjsObjectAtPath() { const path = this._yjsObjectPath; const ctx = yjsBindingContext.get(this); return resolveYjsPath(ctx.yjsObject, path); } get yjsText() { const yjsObject = this._yjsObjectAtPath; if (!(yjsObject instanceof Y.Text)) { throw failure(`Y.Text was expected at path ${JSON.stringify(this._yjsObjectPath)}`); } return yjsObject; } get text() { this.yjsTextChangedAtom.reportObserved(); const ctx = yjsBindingContext.get(this); if ((ctx == null ? void 0 : ctx.boundObject) != null) { try { const yjsTextString = this.yjsText.toString(); if (yjsTextString !== "" || this.deltaList.length === 0) { return yjsTextString; } } catch { } } return this.deltaListToText(); } deltaListToText() { const doc = new Y.Doc(); const text = doc.getText(); this.deltaList.forEach((d) => { text.applyDelta(d.data); }); return text.toString(); } onInit() { const shouldReplicateToYjs = (ctx) => { return !!ctx && !!ctx.boundObject && !ctx.isApplyingYjsChangesToMobxKeystone; }; let reapplyDeltasToYjsText = false; const newDeltas = []; let disposeObserveDeltaList; const disposeReactionToDeltaListRefChange = reaction( () => this.$.deltaList, (deltaList) => { disposeObserveDeltaList == null ? void 0 : disposeObserveDeltaList(); disposeObserveDeltaList = void 0; disposeObserveDeltaList = observe(deltaList, (change) => { if (reapplyDeltasToYjsText) { return; } if (!shouldReplicateToYjs(yjsBindingContext.get(this))) { return; } if (change.type === "splice" && change.removedCount === 0 && change.addedCount > 0 && change.index === this.deltaList.length) { newDeltas.push(...change.added); } else { reapplyDeltasToYjsText = true; } }); }, { fireImmediately: true } ); const disposeOnSnapshot = onSnapshot(this, () => { try { if (reapplyDeltasToYjsText) { const ctx = yjsBindingContext.get(this); if (shouldReplicateToYjs(ctx)) { const { yjsText } = this; if (isYjsValueDeleted(yjsText)) { throw failure("cannot reapply deltas to deleted Yjs.Text"); } ctx.yjsDoc.transact(() => { if (yjsText.length > 0) { yjsText.delete(0, yjsText.length); } this.deltaList.forEach((frozenDeltas) => { yjsText.applyDelta(frozenDeltas.data); }); }, ctx.yjsOrigin); } } else if (newDeltas.length > 0) { const ctx = yjsBindingContext.get(this); if (shouldReplicateToYjs(ctx)) { const { yjsText } = this; if (isYjsValueDeleted(yjsText)) { throw failure("cannot reapply deltas to deleted Yjs.Text"); } ctx.yjsDoc.transact(() => { newDeltas.forEach((frozenDeltas) => { yjsText.applyDelta(frozenDeltas.data); }); }, ctx.yjsOrigin); } } } finally { reapplyDeltasToYjsText = false; newDeltas.length = 0; } }); const diposeYjsTextChangedAtom = hookYjsTextChangedAtom( () => this.yjsText, this.yjsTextChangedAtom ); return () => { disposeOnSnapshot(); disposeReactionToDeltaListRefChange(); disposeObserveDeltaList == null ? void 0 : disposeObserveDeltaList(); disposeObserveDeltaList = void 0; diposeYjsTextChangedAtom(); }; } }; __decorateClass([ computed ], YjsTextModel.prototype, "_yjsObjectPath", 1); __decorateClass([ computed ], YjsTextModel.prototype, "_yjsObjectAtPath", 1); __decorateClass([ computed ], YjsTextModel.prototype, "yjsText", 1); __decorateClass([ computed ], YjsTextModel.prototype, "text", 1); YjsTextModel = __decorateClass([ model(yjsTextModelId) ], YjsTextModel); const DecoratedYjsTextModel = YjsTextModel; function hookYjsTextChangedAtom(getYjsText, textChangedAtom) { let disposeObserveYjsText; const observeFn = () => { textChangedAtom.reportChanged(); }; const disposeReactionToYTextChange = reaction( () => { try { const yjsText = getYjsText(); return isYjsValueDeleted(yjsText) ? void 0 : yjsText; } catch { return void 0; } }, (yjsText) => { disposeObserveYjsText == null ? void 0 : disposeObserveYjsText(); disposeObserveYjsText = void 0; if (yjsText) { yjsText.observe(observeFn); disposeObserveYjsText = () => { yjsText.unobserve(observeFn); }; } textChangedAtom.reportChanged(); }, { fireImmediately: true } ); return () => { disposeReactionToYTextChange(); disposeObserveYjsText == null ? void 0 : disposeObserveYjsText(); disposeObserveYjsText = void 0; }; } const yjsContainerToSnapshot = /* @__PURE__ */ new WeakMap(); function setYjsContainerSnapshot(container, snapshot) { yjsContainerToSnapshot.set(container, snapshot); } function isYjsContainerUpToDate(container, snapshot) { return yjsContainerToSnapshot.get(container) === snapshot; } function isPlainPrimitive(v) { const t = typeof v; return t === "string" || t === "number" || t === "boolean" || v === null || v === void 0; } function isPlainArray(v) { return Array.isArray(v); } function isPlainObject(v) { return typeof v === "object" && v !== null && !Array.isArray(v); } function convertJsonToYjsData(v) { if (isPlainPrimitive(v)) { return v; } if (isPlainArray(v)) { const arr = new Y.Array(); applyJsonArrayToYArray(arr, v); return arr; } if (isPlainObject(v)) { if (v[frozenKey] === true) { return v; } if (v[modelTypeKey] === yjsTextModelId) { const text = new Y.Text(); const yjsTextModel = v; yjsTextModel.deltaList.forEach((frozenDeltas) => { text.applyDelta(frozenDeltas.data); }); return text; } const map = new Y.Map(); applyJsonObjectToYMap(map, v); return map; } throw new Error(`unsupported value type: ${v}`); } const applyJsonArrayToYArray = (dest, source, options = {}) => { const { mode = "add" } = options; if (mode === "merge" && isYjsContainerUpToDate(dest, source)) { return; } const srcLen = source.length; if (mode === "add") { for (let i = 0; i < srcLen; i++) { dest.push([convertJsonToYjsData(source[i])]); } return; } const destLen = dest.length; if (destLen > srcLen) { dest.delete(srcLen, destLen - srcLen); } const minLen = Math.min(destLen, srcLen); for (let i = 0; i < minLen; i++) { const srcItem = source[i]; const destItem = dest.get(i); if (isPlainObject(srcItem) && destItem instanceof Y.Map) { applyJsonObjectToYMap(destItem, srcItem, options); continue; } if (isPlainArray(srcItem) && destItem instanceof Y.Array) { applyJsonArrayToYArray(destItem, srcItem, options); continue; } if (isPlainPrimitive(srcItem) && destItem === srcItem) { continue; } dest.delete(i, 1); dest.insert(i, [convertJsonToYjsData(srcItem)]); } for (let i = destLen; i < srcLen; i++) { dest.push([convertJsonToYjsData(source[i])]); } setYjsContainerSnapshot(dest, source); }; const applyJsonObjectToYMap = (dest, source, options = {}) => { const { mode = "add" } = options; if (mode === "merge" && isYjsContainerUpToDate(dest, source)) { return; } if (mode === "add") { for (const k of Object.keys(source)) { const v = source[k]; if (v !== void 0) { dest.set(k, convertJsonToYjsData(v)); } } return; } const sourceKeysWithValues = new Set(Object.keys(source).filter((k) => source[k] !== void 0)); for (const key of dest.keys()) { if (!sourceKeysWithValues.has(key)) { dest.delete(key); } } for (const k of Object.keys(source)) { const v = source[k]; if (v === void 0) { continue; } const existing = dest.get(k); if (isPlainObject(v) && existing instanceof Y.Map) { applyJsonObjectToYMap(existing, v, options); continue; } if (isPlainArray(v) && existing instanceof Y.Array) { applyJsonArrayToYArray(existing, v, options); continue; } if (isPlainPrimitive(v) && existing === v) { continue; } dest.set(k, convertJsonToYjsData(v)); } setYjsContainerSnapshot(dest, source); }; function convertValue(v) { if (v === null || v === void 0 || typeof v !== "object") { return v; } if (Array.isArray(v) && v.length === 0) { return new Y.Array(); } return convertJsonToYjsData(v); } function applyMobxChangeToYjsObject(change, yjsObject) { if (isYjsValueDeleted(yjsObject)) { throw failure("cannot apply patch to deleted Yjs value"); } const yjsContainer = resolveYjsPath(yjsObject, change.path); if (!yjsContainer) { return; } if (yjsContainer instanceof Y.Array) { if (change.type === DeepChangeType.ArraySplice) { yjsContainer.delete(change.index, change.removedValues.length); if (change.addedValues.length > 0) { const valuesToInsert = change.addedValues.map(convertValue); yjsContainer.insert(change.index, valuesToInsert); } } else if (change.type === DeepChangeType.ArrayUpdate) { yjsContainer.delete(change.index, 1); yjsContainer.insert(change.index, [convertValue(change.newValue)]); } else { throw failure(`unsupported array change type: ${change.type}`); } } else if (yjsContainer instanceof Y.Map) { if (change.type === DeepChangeType.ObjectAdd || change.type === DeepChangeType.ObjectUpdate) { const key = change.key; if (change.newValue === void 0) { yjsContainer.delete(key); } else { yjsContainer.set(key, convertValue(change.newValue)); } } else if (change.type === DeepChangeType.ObjectRemove) { const key = change.key; yjsContainer.delete(key); } else { throw failure(`unsupported object change type: ${change.type}`); } } else if (yjsContainer instanceof Y.Text) { return; } else { throw failure(`unsupported Yjs container type: ${yjsContainer}`); } } const convertYjsDataToJson = action((yjsData) => { if (yjsData instanceof Y.Array) { return yjsData.map((v) => convertYjsDataToJson(v)); } if (yjsData instanceof Y.Map) { const obj = {}; yjsData.forEach((v, k) => { obj[k] = convertYjsDataToJson(v); }); return obj; } if (yjsData instanceof Y.Text) { const deltas = yjsData.toDelta(); return modelSnapshotOutWithMetadata(YjsTextModel, { deltaList: deltas.length > 0 ? [{ $frozen: true, data: deltas }] : [] }); } return yjsData; }); function applyYjsEventToMobx(event, boundObject, reconciliationMap) { const path = event.path; const { value: target } = resolvePath(boundObject, path); if (!target) { throw failure(`cannot resolve path ${JSON.stringify(path)}`); } runUnprotected(() => { if (event instanceof Y.YMapEvent) { applyYMapEventToMobx(event, target, reconciliationMap); } else if (event instanceof Y.YArrayEvent) { applyYArrayEventToMobx(event, target, reconciliationMap); } else if (event instanceof Y.YTextEvent) { applyYTextEventToMobx(event, target); } }); } function processDeletedValue(val, reconciliationMap) { if (val && typeof val === "object" && isModel(val)) { const sn = getSnapshot(val); const id = getSnapshotModelId(sn); if (id) { reconciliationMap.set(id, val); } } } function reviveValue(jsonValue, reconciliationMap) { if (jsonValue === null || typeof jsonValue !== "object") { return jsonValue; } if (isFrozenSnapshot(jsonValue)) { return frozen(jsonValue.data); } if (reconciliationMap && jsonValue && typeof jsonValue === "object") { const modelId = getSnapshotModelId(jsonValue); if (modelId) { const existing = reconciliationMap.get(modelId); if (existing) { reconciliationMap.delete(modelId); return existing; } } } return fromSnapshot(jsonValue); } function applyYMapEventToMobx(event, target, reconciliationMap) { const source = event.target; event.changes.keys.forEach((change, key) => { switch (change.action) { case "add": case "update": { const yjsValue = source.get(key); const jsonValue = convertYjsDataToJson(yjsValue); if (change.action === "update") { processDeletedValue(target[key], reconciliationMap); } target[key] = reviveValue(jsonValue, reconciliationMap); break; } case "delete": { processDeletedValue(target[key], reconciliationMap); if (isModel(target)) { remove(target.$, key); } else { remove(target, key); } break; } default: throw failure(`unsupported Yjs map event action: ${change.action}`); } }); } function applyYArrayEventToMobx(event, target, reconciliationMap) { let currentIndex = 0; for (const change of event.changes.delta) { if (change.retain) { currentIndex += change.retain; } if (change.delete) { const deletedItems = target.slice(currentIndex, currentIndex + change.delete); deletedItems.forEach((item) => { processDeletedValue(item, reconciliationMap); }); target.splice(currentIndex, change.delete); } if (change.insert) { const insertedItems = Array.isArray(change.insert) ? change.insert : [change.insert]; const values = insertedItems.map((yjsValue) => { const jsonValue = convertYjsDataToJson(yjsValue); return reviveValue(jsonValue, reconciliationMap); }); target.splice(currentIndex, 0, ...values); currentIndex += values.length; } } } function applyYTextEventToMobx(event, target) { if (target == null ? void 0 : target.deltaList) { target.deltaList.push(frozen(event.delta)); } } function captureChangeSnapshots(change) { if (change.type === DeepChangeType.ArraySplice && change.addedValues.length > 0) { const snapshots = change.addedValues.map((v) => isTreeNode(v) ? getSnapshot(v) : v); return { ...change, addedValues: snapshots }; } else if (change.type === DeepChangeType.ArrayUpdate) { const snapshot = isTreeNode(change.newValue) ? getSnapshot(change.newValue) : change.newValue; return { ...change, newValue: snapshot }; } else if (change.type === DeepChangeType.ObjectAdd || change.type === DeepChangeType.ObjectUpdate) { const snapshot = isTreeNode(change.newValue) ? getSnapshot(change.newValue) : change.newValue; return { ...change, newValue: snapshot }; } return change; } function bindYjsToMobxKeystone({ yjsDoc, yjsObject, mobxKeystoneType }) { const yjsOrigin = /* @__PURE__ */ Symbol("bindYjsToMobxKeystoneTransactionOrigin"); let applyingYjsChangesToMobxKeystone = 0; const bindingContext = { yjsDoc, yjsObject, mobxKeystoneType, yjsOrigin, boundObject: void 0, // not yet created get isApplyingYjsChangesToMobxKeystone() { return applyingYjsChangesToMobxKeystone > 0; } }; if (isYjsValueDeleted(yjsObject)) { throw failure("cannot apply patch to deleted Yjs value"); } const yjsJson = convertYjsDataToJson(yjsObject); let boundObject; let hasInitChanges = false; const createBoundObject = () => { const disposeGlobalListener = onGlobalDeepChange((_target, change) => { if (change.isInit) { hasInitChanges = true; } }); try { const result = yjsBindingContext.apply( () => fromSnapshot(mobxKeystoneType, yjsJson), bindingContext ); yjsBindingContext.set(result, { ...bindingContext, boundObject: result }); return result; } finally { disposeGlobalListener(); } }; boundObject = createBoundObject(); const observeDeepCb = action((events) => { const eventsToApply = []; events.forEach((event) => { var _a; if (event.transaction.origin !== yjsOrigin) { eventsToApply.push(event); } if (event.target instanceof Y.Map || event.target instanceof Y.Array) { (_a = getYjsCollectionAtom(event.target)) == null ? void 0 : _a.reportChanged(); } }); if (eventsToApply.length > 0) { applyingYjsChangesToMobxKeystone++; try { const reconciliationMap = /* @__PURE__ */ new Map(); const initChanges = []; const disposeGlobalListener = onGlobalDeepChange((target, change) => { if (change.isInit) { initChanges.push({ target, change: captureChangeSnapshots(change) }); } }); try { eventsToApply.forEach((event) => { applyYjsEventToMobx(event, boundObject, reconciliationMap); }); } finally { disposeGlobalListener(); } if (initChanges.length > 0 && !isYjsValueDeleted(yjsObject)) { yjsDoc.transact(() => { for (const { target, change } of initChanges) { const pathToTarget = getParentToChildPath(boundObject, target); if (pathToTarget !== void 0) { const changeWithCorrectPath = { ...change, path: [...pathToTarget, ...change.path] }; applyMobxChangeToYjsObject(changeWithCorrectPath, yjsObject); } } }, yjsOrigin); } if (yjsObject instanceof Y.Map || yjsObject instanceof Y.Array) { setYjsContainerSnapshot(yjsObject, getSnapshot(boundObject)); } } finally { applyingYjsChangesToMobxKeystone--; } } }); yjsObject.observeDeep(observeDeepCb); let pendingChanges = []; const disposeOnDeepChange = onDeepChange(boundObject, (change) => { if (applyingYjsChangesToMobxKeystone > 0) { return; } if (change.isInit) { return; } pendingChanges.push(captureChangeSnapshots(change)); }); const disposeOnSnapshot = onSnapshot(boundObject, (boundObjectSnapshot) => { if (pendingChanges.length === 0) { return; } const changesToApply = pendingChanges; pendingChanges = []; if (isYjsValueDeleted(yjsObject)) { return; } yjsDoc.transact(() => { changesToApply.forEach((change) => { applyMobxChangeToYjsObject(change, yjsObject); }); }, yjsOrigin); if (yjsObject instanceof Y.Map || yjsObject instanceof Y.Array) { setYjsContainerSnapshot(yjsObject, boundObjectSnapshot); } }); const finalSnapshot = getSnapshot(boundObject); if (hasInitChanges) { yjsDoc.transact(() => { if (yjsObject instanceof Y.Map) { applyJsonObjectToYMap(yjsObject, finalSnapshot, { mode: "merge" }); } else if (yjsObject instanceof Y.Array) { applyJsonArrayToYArray(yjsObject, finalSnapshot, { mode: "merge" }); } }, yjsOrigin); } if (yjsObject instanceof Y.Map || yjsObject instanceof Y.Array) { setYjsContainerSnapshot(yjsObject, finalSnapshot); } const dispose = () => { yjsDoc.off("destroy", dispose); disposeOnDeepChange(); disposeOnSnapshot(); yjsObject.unobserveDeep(observeDeepCb); }; yjsDoc.on("destroy", dispose); return { boundObject, dispose, yjsOrigin }; } export { MobxKeystoneYjsError, YjsTextModel, applyJsonArrayToYArray, applyJsonObjectToYMap, bindYjsToMobxKeystone, convertJsonToYjsData, yjsBindingContext, yjsTextModelId }; //# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"file":"mobx-keystone-yjs.esm.mjs","sources":["../src/utils/error.ts","../src/utils/getOrCreateYjsCollectionAtom.ts","../src/utils/isYjsValueDeleted.ts","../src/binding/resolveYjsPath.ts","../src/binding/yjsBindingContext.ts","../src/binding/YjsTextModel.ts","../src/binding/yjsSnapshotTracking.ts","../src/binding/convertJsonToYjsData.ts","../src/binding/applyMobxChangeToYjsObject.ts","../src/binding/convertYjsDataToJson.ts","../src/binding/applyYjsEventToMobx.ts","../src/binding/bindYjsToMobxKeystone.ts"],"sourcesContent":["/**\r\n * A mobx-keystone-yjs error.\r\n */\r\nexport class MobxKeystoneYjsError extends Error {\r\n  constructor(msg: string) {\r\n    super(msg)\r\n\r\n    // Set the prototype explicitly.\r\n    Object.setPrototypeOf(this, MobxKeystoneYjsError.prototype)\r\n  }\r\n}\r\n\r\n/**\r\n * @internal\r\n */\r\nexport function failure(msg: string) {\r\n  return new MobxKeystoneYjsError(msg)\r\n}\r\n","import { createAtom, IAtom } from \"mobx\"\nimport * as Y from \"yjs\"\n\nconst yjsCollectionAtoms = new WeakMap<Y.Map<unknown> | Y.Array<unknown>, IAtom>()\n\n/**\n * @internal\n */\nexport const getYjsCollectionAtom = (\n  yjsCollection: Y.Map<unknown> | Y.Array<unknown>\n): IAtom | undefined => {\n  return yjsCollectionAtoms.get(yjsCollection)\n}\n\n/**\n * @internal\n */\nexport const getOrCreateYjsCollectionAtom = (\n  yjsCollection: Y.Map<unknown> | Y.Array<unknown>\n): IAtom => {\n  let atom = yjsCollectionAtoms.get(yjsCollection)\n  if (!atom) {\n    atom = createAtom(`yjsCollectionAtom`)\n    yjsCollectionAtoms.set(yjsCollection, atom)\n  }\n  return atom\n}\n","import * as Y from \"yjs\"\n\n/**\n * Checks if a Y.js value has been deleted or its document destroyed.\n *\n * @param yjsValue The Y.js value to check.\n * @returns `true` if the value is deleted or destroyed, `false` otherwise.\n */\nexport function isYjsValueDeleted(yjsValue: unknown): boolean {\n  if (yjsValue instanceof Y.AbstractType) {\n    return !!(yjsValue as any)._item?.deleted || !!yjsValue.doc?.isDestroyed\n  }\n  return false\n}\n","import * as Y from \"yjs\"\nimport { failure } from \"../utils/error\"\nimport { getOrCreateYjsCollectionAtom } from \"../utils/getOrCreateYjsCollectionAtom\"\n\n/**\n * Resolves a path within a Yjs object structure.\n * Returns the Yjs container at the specified path.\n *\n * When a Y.Text is encountered during path resolution (either at the start\n * or mid-path), it is returned immediately since Y.Text doesn't support\n * nested path traversal.\n *\n * @param yjsObject The root Yjs object\n * @param path Array of keys/indices to traverse\n * @returns The Yjs container at the path, or Y.Text if encountered during traversal\n */\nexport function resolveYjsPath(\n  yjsObject: Y.Map<unknown> | Y.Array<unknown> | Y.Text,\n  path: readonly (string | number)[]\n): unknown {\n  let currentYjsObject: unknown = yjsObject\n\n  let i = -1\n  for (const pathPart of path) {\n    i++\n    // If we encounter a Y.Text during path resolution, return it immediately.\n    // Y.Text objects don't support nested path traversal, and their updates\n    // are handled separately by YjsTextModel's own synchronization mechanism.\n    if (currentYjsObject instanceof Y.Text) {\n      return currentYjsObject\n    }\n\n    if (currentYjsObject instanceof Y.Map) {\n      getOrCreateYjsCollectionAtom(currentYjsObject).reportObserved()\n      const key = String(pathPart)\n      currentYjsObject = currentYjsObject.get(key)\n    } else if (currentYjsObject instanceof Y.Array) {\n      getOrCreateYjsCollectionAtom(currentYjsObject).reportObserved()\n      const key = Number(pathPart)\n      currentYjsObject = currentYjsObject.get(key)\n    } else {\n      throw failure(\n        `Y.Map or Y.Array was expected at path ${JSON.stringify(\n          path.slice(0, i)\n        )} in order to resolve path ${JSON.stringify(path)}, but got ${currentYjsObject} instead`\n      )\n    }\n  }\n\n  return currentYjsObject\n}\n","import { AnyType, createContext } from \"mobx-keystone\"\nimport * as Y from \"yjs\"\n\n/**\n * Context with info on how a mobx-keystone model is bound to a Y.js data structure.\n */\nexport interface YjsBindingContext {\n  /**\n   * The Y.js document.\n   */\n  yjsDoc: Y.Doc\n\n  /**\n   * The bound Y.js data structure.\n   */\n  yjsObject: Y.Map<unknown> | Y.Array<unknown> | Y.Text\n\n  /**\n   * The mobx-keystone model type.\n   */\n  mobxKeystoneType: AnyType\n\n  /**\n   * The origin symbol used for transactions.\n   */\n  yjsOrigin: symbol\n\n  /**\n   * The bound mobx-keystone instance.\n   */\n  boundObject: unknown\n\n  /**\n   * Whether we are currently applying Y.js changes to the mobx-keystone model.\n   */\n  isApplyingYjsChangesToMobxKeystone: boolean\n}\n\n/**\n * Context with info on how a mobx-keystone model is bound to a Y.js data structure.\n */\nexport const yjsBindingContext = createContext<YjsBindingContext | undefined>(undefined)\n","import { computed, createAtom, IAtom, observe, reaction } from \"mobx\"\nimport {\n  Frozen,\n  frozen,\n  getParentToChildPath,\n  Model,\n  model,\n  onSnapshot,\n  tProp,\n  types,\n} from \"mobx-keystone\"\nimport * as Y from \"yjs\"\nimport { failure } from \"../utils/error\"\nimport { isYjsValueDeleted } from \"../utils/isYjsValueDeleted\"\nimport { resolveYjsPath } from \"./resolveYjsPath\"\nimport { YjsBindingContext, yjsBindingContext } from \"./yjsBindingContext\"\n\n// Delta[][], since each single change is a Delta[]\n// we use frozen so that we can reuse each delta change\nconst deltaListType = types.array(types.frozen(types.unchecked<unknown[]>()))\n\nexport const yjsTextModelId = \"mobx-keystone-yjs/YjsTextModel\"\n\n/**\n * A mobx-keystone model that represents a Yjs.Text object.\n */\n@model(yjsTextModelId)\nexport class YjsTextModel extends Model({\n  deltaList: tProp(deltaListType, () => []),\n}) {\n  /**\n   * Helper function to create a YjsTextModel instance with a simple text.\n   */\n  static withText(text: string): YjsTextModel {\n    return new DecoratedYjsTextModel({\n      deltaList: [\n        frozen([\n          {\n            insert: text,\n          },\n        ]),\n      ],\n    })\n  }\n\n  /**\n   * The Y.js path from the bound object to the YjsTextModel instance.\n   */\n  @computed\n  private get _yjsObjectPath() {\n    const ctx = yjsBindingContext.get(this)\n    if (ctx?.boundObject == null) {\n      throw failure(\n        \"the YjsTextModel instance must be part of a bound object before it can be accessed\"\n      )\n    }\n\n    const path = getParentToChildPath(ctx.boundObject, this)\n    if (!path) {\n      throw failure(\"a path from the bound object to the YjsTextModel instance is not available\")\n    }\n\n    return path\n  }\n\n  /**\n   * The Yjs.Text object present at this mobx-keystone node's path.\n   */\n  @computed\n  private get _yjsObjectAtPath(): unknown {\n    const path = this._yjsObjectPath\n\n    const ctx = yjsBindingContext.get(this)!\n\n    return resolveYjsPath(ctx.yjsObject, path)\n  }\n\n  /**\n   * The Yjs.Text object represented by this mobx-keystone node.\n   */\n  @computed\n  get yjsText(): Y.Text {\n    const yjsObject = this._yjsObjectAtPath\n\n    if (!(yjsObject instanceof Y.Text)) {\n      throw failure(`Y.Text was expected at path ${JSON.stringify(this._yjsObjectPath)}`)\n    }\n\n    return yjsObject\n  }\n\n  /**\n   * Atom that gets changed when the associated Y.js text changes.\n   */\n  yjsTextChangedAtom = createAtom(\"yjsTextChangedAtom\")\n\n  /**\n   * The text value of the Yjs.Text object.\n   * Shortcut for `yjsText.toString()`, but computed.\n   */\n  @computed\n  get text(): string {\n    this.yjsTextChangedAtom.reportObserved()\n\n    const ctx = yjsBindingContext.get(this)\n    if (ctx?.boundObject != null) {\n      try {\n        const yjsTextString = this.yjsText.toString()\n        // if the yjsText is detached, toString() returns an empty string\n        // in that case we should use the deltaList as a fallback\n        if (yjsTextString !== \"\" || this.deltaList.length === 0) {\n          return yjsTextString\n        }\n      } catch {\n        // fall back\n      }\n    }\n\n    // fall back to deltaList\n    return this.deltaListToText()\n  }\n\n  private deltaListToText(): string {\n    const doc = new Y.Doc()\n    const text = doc.getText()\n    this.deltaList.forEach((d) => {\n      text.applyDelta(d.data)\n    })\n    return text.toString()\n  }\n\n  protected onInit() {\n    const shouldReplicateToYjs = (ctx: YjsBindingContext | undefined): ctx is YjsBindingContext => {\n      return !!ctx && !!ctx.boundObject && !ctx.isApplyingYjsChangesToMobxKeystone\n    }\n\n    let reapplyDeltasToYjsText = false\n    const newDeltas: Frozen<unknown[]>[] = []\n\n    let disposeObserveDeltaList: (() => void) | undefined\n\n    const disposeReactionToDeltaListRefChange = reaction(\n      () => this.$.deltaList,\n      (deltaList) => {\n        disposeObserveDeltaList?.()\n        disposeObserveDeltaList = undefined\n\n        disposeObserveDeltaList = observe(deltaList, (change) => {\n          if (reapplyDeltasToYjsText) {\n            // already gonna replace them all\n            return\n          }\n          if (!shouldReplicateToYjs(yjsBindingContext.get(this))) {\n            // yjs text is already up to date with these changes\n            return\n          }\n\n          if (\n            change.type === \"splice\" &&\n            change.removedCount === 0 &&\n            change.addedCount > 0 &&\n            change.index === this.deltaList.length\n          ) {\n            // optimization, just adding new ones to the end\n            newDeltas.push(...change.added)\n          } else {\n            // any other change, we need to reapply all deltas\n            reapplyDeltasToYjsText = true\n          }\n        })\n      },\n      { fireImmediately: true }\n    )\n\n    const disposeOnSnapshot = onSnapshot(this, () => {\n      try {\n        if (reapplyDeltasToYjsText) {\n          const ctx = yjsBindingContext.get(this)\n\n          if (shouldReplicateToYjs(ctx)) {\n            const { yjsText } = this\n            if (isYjsValueDeleted(yjsText)) {\n              throw failure(\"cannot reapply deltas to deleted Yjs.Text\")\n            }\n\n            ctx.yjsDoc.transact(() => {\n              // didn't find a better way than this to reapply all deltas\n              // without having to re-create the Y.Text object\n              if (yjsText.length > 0) {\n                yjsText.delete(0, yjsText.length)\n              }\n\n              this.deltaList.forEach((frozenDeltas) => {\n                yjsText.applyDelta(frozenDeltas.data)\n              })\n            }, ctx.yjsOrigin)\n          }\n        } else if (newDeltas.length > 0) {\n          const ctx = yjsBindingContext.get(this)\n\n          if (shouldReplicateToYjs(ctx)) {\n            const { yjsText } = this\n            if (isYjsValueDeleted(yjsText)) {\n              throw failure(\"cannot reapply deltas to deleted Yjs.Text\")\n            }\n\n            ctx.yjsDoc.transact(() => {\n              newDeltas.forEach((frozenDeltas) => {\n                yjsText.applyDelta(frozenDeltas.data)\n              })\n            }, ctx.yjsOrigin)\n          }\n        }\n      } finally {\n        reapplyDeltasToYjsText = false\n        newDeltas.length = 0\n      }\n    })\n\n    const diposeYjsTextChangedAtom = hookYjsTextChangedAtom(\n      () => this.yjsText,\n      this.yjsTextChangedAtom\n    )\n\n    return () => {\n      disposeOnSnapshot()\n      disposeReactionToDeltaListRefChange()\n      disposeObserveDeltaList?.()\n      disposeObserveDeltaList = undefined\n\n      diposeYjsTextChangedAtom()\n    }\n  }\n}\n\n// we use this trick just to avoid a babel bug that causes classes used inside classes not to be overriden\n// by the decorator\nconst DecoratedYjsTextModel = YjsTextModel\n\nfunction hookYjsTextChangedAtom(getYjsText: () => Y.Text, textChangedAtom: IAtom) {\n  let disposeObserveYjsText: (() => void) | undefined\n\n  const observeFn = () => {\n    textChangedAtom.reportChanged()\n  }\n\n  const disposeReactionToYTextChange = reaction(\n    () => {\n      try {\n        const yjsText = getYjsText()\n        return isYjsValueDeleted(yjsText) ? undefined : yjsText\n      } catch {\n        return undefined\n      }\n    },\n    (yjsText) => {\n      disposeObserveYjsText?.()\n      disposeObserveYjsText = undefined\n\n      if (yjsText) {\n        yjsText.observe(observeFn)\n\n        disposeObserveYjsText = () => {\n          yjsText.unobserve(observeFn)\n        }\n      }\n\n      textChangedAtom.reportChanged()\n    },\n    {\n      fireImmediately: true,\n    }\n  )\n\n  return () => {\n    disposeReactionToYTextChange()\n    disposeObserveYjsText?.()\n    disposeObserveYjsText = undefined\n  }\n}\n","import * as Y from \"yjs\"\n\n/**\n * WeakMap that tracks which snapshot each Y.js container was last synced from.\n * This is used during reconciliation to skip containers that are already up-to-date.\n *\n * The key is the Y.js container (Y.Map or Y.Array).\n * The value is the snapshot (plain object or array) that was last synced to it.\n */\nexport const yjsContainerToSnapshot = new WeakMap<Y.Map<any> | Y.Array<any>, unknown>()\n\n/**\n * Updates the snapshot tracking for a Y.js container.\n * Call this after syncing a snapshot to a Y.js container.\n */\nexport function setYjsContainerSnapshot(\n  container: Y.Map<any> | Y.Array<any>,\n  snapshot: unknown\n): void {\n  yjsContainerToSnapshot.set(container, snapshot)\n}\n\n/**\n * Gets the last synced snapshot for a Y.js container.\n * Returns undefined if the container has never been synced.\n */\nexport function getYjsContainerSnapshot(container: Y.Map<any> | Y.Array<any>): unknown {\n  return yjsContainerToSnapshot.get(container)\n}\n\n/**\n * Checks if a Y.js container is up-to-date with the given snapshot.\n * Uses reference equality to check if the snapshot is the same.\n */\nexport function isYjsContainerUpToDate(\n  container: Y.Map<any> | Y.Array<any>,\n  snapshot: unknown\n): boolean {\n  return yjsContainerToSnapshot.get(container) === snapshot\n}\n","import { frozenKey, modelTypeKey, SnapshotOutOf } from \"mobx-keystone\"\nimport * as Y from \"yjs\"\nimport { PlainArray, PlainObject, PlainPrimitive, PlainValue } from \"../plainTypes\"\nimport { YjsData } from \"./convertYjsDataToJson\"\nimport { YjsTextModel, yjsTextModelId } from \"./YjsTextModel\"\nimport { isYjsContainerUpToDate, setYjsContainerSnapshot } from \"./yjsSnapshotTracking\"\n\n/**\n * Options for applying JSON data to Y.js data structures.\n */\nexport interface ApplyJsonToYjsOptions {\n  /**\n   * The mode to use when applying JSON data to Y.js data structures.\n   * - `add`: Creates new Y.js containers for objects/arrays (default, backwards compatible)\n   * - `merge`: Recursively merges values, preserving existing container references where possible\n   */\n  mode?: \"add\" | \"merge\"\n}\n\nfunction isPlainPrimitive(v: PlainValue): v is PlainPrimitive {\n  const t = typeof v\n  return t === \"string\" || t === \"number\" || t === \"boolean\" || v === null || v === undefined\n}\n\nfunction isPlainArray(v: PlainValue): v is PlainArray {\n  return Array.isArray(v)\n}\n\nfunction isPlainObject(v: PlainValue): v is PlainObject {\n  return typeof v === \"object\" && v !== null && !Array.isArray(v)\n}\n\n/**\n * Converts a plain value to a Y.js data structure.\n * Objects are converted to Y.Maps, arrays to Y.Arrays, primitives are untouched.\n * Frozen values are a special case and they are kept as immutable plain values.\n */\nexport function convertJsonToYjsData(v: PlainValue): YjsData {\n  if (isPlainPrimitive(v)) {\n    return v\n  }\n\n  if (isPlainArray(v)) {\n    const arr = new Y.Array()\n    applyJsonArrayToYArray(arr, v)\n    return arr\n  }\n\n  if (isPlainObject(v)) {\n    if (v[frozenKey] === true) {\n      // frozen value, save as immutable object\n      return v\n    }\n\n    if (v[modelTypeKey] === yjsTextModelId) {\n      const text = new Y.Text()\n      const yjsTextModel = v as unknown as SnapshotOutOf<YjsTextModel>\n      yjsTextModel.deltaList.forEach((frozenDeltas) => {\n        text.applyDelta(frozenDeltas.data)\n      })\n      return text\n    }\n\n    const map = new Y.Map()\n    applyJsonObjectToYMap(map, v)\n    return map\n  }\n\n  throw new Error(`unsupported value type: ${v}`)\n}\n\n/**\n * Applies a JSON array to a Y.Array, using the convertJsonToYjsData to convert the values.\n *\n * @param dest The destination Y.Array.\n * @param source The source JSON array.\n * @param options Options for applying the JSON data.\n */\nexport const applyJsonArrayToYArray = (\n  dest: Y.Array<any>,\n  source: PlainArray,\n  options: ApplyJsonToYjsOptions = {}\n) => {\n  const { mode = \"add\" } = options\n\n  // In merge mode, check if the container is already up-to-date with this snapshot\n  if (mode === \"merge\" && isYjsContainerUpToDate(dest, source)) {\n    return\n  }\n\n  const srcLen = source.length\n\n  if (mode === \"add\") {\n    // Add mode: just push all items to the end\n    for (let i = 0; i < srcLen; i++) {\n      dest.push([convertJsonToYjsData(source[i])])\n    }\n    return\n  }\n\n  // Merge mode: recursively merge values, preserving existing container references\n  const destLen = dest.length\n\n  // Remove extra items from the end\n  if (destLen > srcLen) {\n    dest.delete(srcLen, destLen - srcLen)\n  }\n\n  // Update existing items\n  const minLen = Math.min(destLen, srcLen)\n  for (let i = 0; i < minLen; i++) {\n    const srcItem = source[i]\n    const destItem = dest.get(i)\n\n    // If both are objects, merge recursively\n    if (isPlainObject(srcItem) && destItem instanceof Y.Map) {\n      applyJsonObjectToYMap(destItem, srcItem, options)\n      continue\n    }\n\n    // If both are arrays, merge recursively\n    if (isPlainArray(srcItem) && destItem instanceof Y.Array) {\n      applyJsonArrayToYArray(destItem, srcItem, options)\n      continue\n    }\n\n    // Skip if primitive value is unchanged (optimization)\n    if (isPlainPrimitive(srcItem) && destItem === srcItem) {\n      continue\n    }\n\n    // Otherwise, replace the item\n    dest.delete(i, 1)\n    dest.insert(i, [convertJsonToYjsData(srcItem)])\n  }\n\n  // Add new items at the end\n  for (let i = destLen; i < srcLen; i++) {\n    dest.push([convertJsonToYjsData(source[i])])\n  }\n\n  // Update snapshot tracking after successful merge\n  setYjsContainerSnapshot(dest, source)\n}\n\n/**\n * Applies a JSON object to a Y.Map, using the convertJsonToYjsData to convert the values.\n *\n * @param dest The destination Y.Map.\n * @param source The source JSON object.\n * @param options Options for applying the JSON data.\n */\nexport const applyJsonObjectToYMap = (\n  dest: Y.Map<any>,\n  source: PlainObject,\n  options: ApplyJsonToYjsOptions = {}\n) => {\n  const { mode = \"add\" } = options\n\n  // In merge mode, check if the container is already up-to-date with this snapshot\n  if (mode === \"merge\" && isYjsContainerUpToDate(dest, source)) {\n    return\n  }\n\n  if (mode === \"add\") {\n    // Add mode: just set all values\n    for (const k of Object.keys(source)) {\n      const v = source[k]\n      if (v !== undefined) {\