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@tanstack/db

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A reactive client store for building super fast apps on sync

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{"version":3,"file":"proxy.cjs","sources":["../../src/proxy.ts"],"sourcesContent":["/**\n * A utility for creating a proxy that captures changes to an object\n * and provides a way to retrieve those changes.\n */\n\n/**\n * Simple debug utility that only logs when debug mode is enabled\n * Set DEBUG to true in localStorage to enable debug logging\n */\nfunction debugLog(...args: Array<unknown>): void {\n // Check if we're in a browser environment\n const isBrowser =\n typeof window !== `undefined` && typeof localStorage !== `undefined`\n\n // In browser, check localStorage for debug flag\n if (isBrowser && localStorage.getItem(`DEBUG`) === `true`) {\n console.log(`[proxy]`, ...args)\n }\n // In Node.js environment, check for environment variable (though this is primarily for browser)\n else if (\n // true\n !isBrowser &&\n typeof process !== `undefined` &&\n process.env.DEBUG === `true`\n ) {\n console.log(`[proxy]`, ...args)\n }\n}\n\n// Add TypedArray interface with proper type\ninterface TypedArray {\n length: number\n [index: number]: number\n}\n\n// Update type for ChangeTracker\ninterface ChangeTracker<T extends object> {\n originalObject: T\n modified: boolean\n copy_: T\n proxyCount: number\n assigned_: Record<string | symbol, boolean>\n parent?:\n | {\n tracker: ChangeTracker<Record<string | symbol, unknown>>\n prop: string | symbol\n }\n | {\n tracker: ChangeTracker<Record<string | symbol, unknown>>\n prop: string | symbol\n updateMap: (newValue: unknown) => void\n }\n | {\n tracker: ChangeTracker<Record<string | symbol, unknown>>\n prop: unknown\n updateSet: (newValue: unknown) => void\n }\n target: T\n}\n\n/**\n * Deep clones an object while preserving special types like Date and RegExp\n */\n\nfunction deepClone<T extends unknown>(\n obj: T,\n visited = new WeakMap<object, unknown>()\n): T {\n // Handle null and undefined\n if (obj === null || obj === undefined) {\n return obj\n }\n\n // Handle primitive types\n if (typeof obj !== `object`) {\n return obj\n }\n\n // If we've already cloned this object, return the cached clone\n if (visited.has(obj as object)) {\n return visited.get(obj as object) as T\n }\n\n if (obj instanceof Date) {\n return new Date(obj.getTime()) as unknown as T\n }\n\n if (obj instanceof RegExp) {\n return new RegExp(obj.source, obj.flags) as unknown as T\n }\n\n if (Array.isArray(obj)) {\n const arrayClone = [] as Array<unknown>\n visited.set(obj as object, arrayClone)\n obj.forEach((item, index) => {\n arrayClone[index] = deepClone(item, visited)\n })\n return arrayClone as unknown as T\n }\n\n // Handle TypedArrays\n if (ArrayBuffer.isView(obj) && !(obj instanceof DataView)) {\n // Get the constructor to create a new instance of the same type\n const TypedArrayConstructor = Object.getPrototypeOf(obj).constructor\n const clone = new TypedArrayConstructor(\n (obj as unknown as TypedArray).length\n ) as unknown as TypedArray\n visited.set(obj as object, clone)\n\n // Copy the values\n for (let i = 0; i < (obj as unknown as TypedArray).length; i++) {\n clone[i] = (obj as unknown as TypedArray)[i]!\n }\n\n return clone as unknown as T\n }\n\n if (obj instanceof Map) {\n const clone = new Map() as Map<unknown, unknown>\n visited.set(obj as object, clone)\n obj.forEach((value, key) => {\n clone.set(key, deepClone(value, visited))\n })\n return clone as unknown as T\n }\n\n if (obj instanceof Set) {\n const clone = new Set()\n visited.set(obj as object, clone)\n obj.forEach((value) => {\n clone.add(deepClone(value, visited))\n })\n return clone as unknown as T\n }\n\n const clone = {} as Record<string | symbol, unknown>\n visited.set(obj as object, clone)\n\n for (const key in obj) {\n if (Object.prototype.hasOwnProperty.call(obj, key)) {\n clone[key] = deepClone(\n (obj as Record<string | symbol, unknown>)[key],\n visited\n )\n }\n }\n\n const symbolProps = Object.getOwnPropertySymbols(obj)\n for (const sym of symbolProps) {\n clone[sym] = deepClone(\n (obj as Record<string | symbol, unknown>)[sym],\n visited\n )\n }\n\n return clone as T\n}\n\n/**\n * Deep equality check that handles special types like Date, RegExp, Map, and Set\n */\nfunction deepEqual<T>(a: T, b: T): boolean {\n // Handle primitive types\n if (a === b) return true\n\n // If either is null or not an object, they're not equal\n if (\n a === null ||\n b === null ||\n typeof a !== `object` ||\n typeof b !== `object`\n ) {\n return false\n }\n\n // Handle Date objects\n if (a instanceof Date && b instanceof Date) {\n return a.getTime() === b.getTime()\n }\n\n // Handle RegExp objects\n if (a instanceof RegExp && b instanceof RegExp) {\n return a.source === b.source && a.flags === b.flags\n }\n\n // Handle Map objects\n if (a instanceof Map && b instanceof Map) {\n if (a.size !== b.size) return false\n\n const entries = Array.from(a.entries())\n for (const [key, val] of entries) {\n if (!b.has(key) || !deepEqual(val, b.get(key))) {\n return false\n }\n }\n\n return true\n }\n\n // Handle Set objects\n if (a instanceof Set && b instanceof Set) {\n if (a.size !== b.size) return false\n\n // Convert to arrays for comparison\n const aValues = Array.from(a)\n const bValues = Array.from(b)\n\n // Simple comparison for primitive values\n if (aValues.every((val) => typeof val !== `object`)) {\n return aValues.every((val) => b.has(val))\n }\n\n // For objects in sets, we need to do a more complex comparison\n // This is a simplified approach and may not work for all cases\n return aValues.length === bValues.length\n }\n\n // Handle arrays\n if (Array.isArray(a) && Array.isArray(b)) {\n if (a.length !== b.length) return false\n\n for (let i = 0; i < a.length; i++) {\n if (!deepEqual(a[i], b[i])) return false\n }\n\n return true\n }\n\n // Handle TypedArrays\n if (\n ArrayBuffer.isView(a) &&\n ArrayBuffer.isView(b) &&\n !(a instanceof DataView) &&\n !(b instanceof DataView)\n ) {\n const typedA = a as unknown as TypedArray\n const typedB = b as unknown as TypedArray\n if (typedA.length !== typedB.length) return false\n\n for (let i = 0; i < typedA.length; i++) {\n if (typedA[i] !== typedB[i]) return false\n }\n\n return true\n }\n\n // Handle plain objects\n const keysA = Object.keys(a as object)\n const keysB = Object.keys(b as object)\n\n if (keysA.length !== keysB.length) return false\n\n return keysA.every(\n (key) =>\n Object.prototype.hasOwnProperty.call(b, key) &&\n deepEqual((a as any)[key], (b as any)[key])\n )\n}\n\nlet count = 0\nfunction getProxyCount() {\n count += 1\n return count\n}\n\n/**\n * Creates a proxy that tracks changes to the target object\n *\n * @param target The object to proxy\n * @param parent Optional parent information\n * @returns An object containing the proxy and a function to get the changes\n */\nexport function createChangeProxy<\n T extends Record<string | symbol, any | undefined>,\n>(\n target: T,\n parent?: {\n tracker: ChangeTracker<Record<string | symbol, unknown>>\n prop: string | symbol\n }\n): {\n proxy: T\n\n getChanges: () => Record<string | symbol, any>\n} {\n const changeProxyCache = new Map<object, object>()\n\n function memoizedCreateChangeProxy<\n TInner extends Record<string | symbol, any | undefined>,\n >(\n innerTarget: TInner,\n innerParent?: {\n tracker: ChangeTracker<Record<string | symbol, unknown>>\n prop: string | symbol\n }\n ): {\n proxy: TInner\n getChanges: () => Record<string | symbol, any>\n } {\n debugLog(`Object ID:`, innerTarget.constructor.name)\n if (changeProxyCache.has(innerTarget)) {\n return changeProxyCache.get(innerTarget) as {\n proxy: TInner\n getChanges: () => Record<string | symbol, any>\n }\n } else {\n const changeProxy = createChangeProxy(innerTarget, innerParent)\n changeProxyCache.set(innerTarget, changeProxy)\n return changeProxy\n }\n }\n // Create a WeakMap to cache proxies for nested objects\n // This prevents creating multiple proxies for the same object\n // and handles circular references\n const proxyCache = new Map<object, object>()\n\n // Create a change tracker to track changes to the object\n const changeTracker: ChangeTracker<T> = {\n copy_: deepClone(target),\n originalObject: deepClone(target),\n proxyCount: getProxyCount(),\n modified: false,\n assigned_: {},\n parent,\n target, // Store reference to the target object\n }\n\n debugLog(\n `createChangeProxy called for target`,\n target,\n changeTracker.proxyCount\n )\n // Mark this object and all its ancestors as modified\n // Also propagate the actual changes up the chain\n function markChanged(state: ChangeTracker<object>) {\n if (!state.modified) {\n state.modified = true\n }\n\n // Propagate the change up the parent chain\n if (state.parent) {\n debugLog(`propagating change to parent`)\n\n // Check if this is a special Map parent with updateMap function\n if (`updateMap` in state.parent) {\n // Use the special updateMap function for Maps\n state.parent.updateMap(state.copy_)\n } else if (`updateSet` in state.parent) {\n // Use the special updateSet function for Sets\n state.parent.updateSet(state.copy_)\n } else {\n // Update parent's copy with this object's current state\n state.parent.tracker.copy_[state.parent.prop] = state.copy_\n state.parent.tracker.assigned_[state.parent.prop] = true\n }\n\n // Mark parent as changed\n markChanged(state.parent.tracker)\n }\n }\n\n // Check if all properties in the current state have reverted to original values\n function checkIfReverted(\n state: ChangeTracker<Record<string | symbol, unknown>>\n ): boolean {\n debugLog(\n `checkIfReverted called with assigned keys:`,\n Object.keys(state.assigned_)\n )\n\n // If there are no assigned properties, object is unchanged\n if (\n Object.keys(state.assigned_).length === 0 &&\n Object.getOwnPropertySymbols(state.assigned_).length === 0\n ) {\n debugLog(`No assigned properties, returning true`)\n return true\n }\n\n // Check each assigned regular property\n for (const prop in state.assigned_) {\n // If this property is marked as assigned\n if (state.assigned_[prop] === true) {\n const currentValue = state.copy_[prop]\n const originalValue = (state.originalObject as any)[prop]\n\n debugLog(\n `Checking property ${String(prop)}, current:`,\n currentValue,\n `original:`,\n originalValue\n )\n\n // If the value is not equal to original, something is still changed\n if (!deepEqual(currentValue, originalValue)) {\n debugLog(`Property ${String(prop)} is different, returning false`)\n return false\n }\n } else if (state.assigned_[prop] === false) {\n // Property was deleted, so it's different from original\n debugLog(`Property ${String(prop)} was deleted, returning false`)\n return false\n }\n }\n\n // Check each assigned symbol property\n const symbolProps = Object.getOwnPropertySymbols(state.assigned_)\n for (const sym of symbolProps) {\n if (state.assigned_[sym] === true) {\n const currentValue = (state.copy_ as any)[sym]\n const originalValue = (state.originalObject as any)[sym]\n\n // If the value is not equal to original, something is still changed\n if (!deepEqual(currentValue, originalValue)) {\n debugLog(`Symbol property is different, returning false`)\n return false\n }\n } else if (state.assigned_[sym] === false) {\n // Property was deleted, so it's different from original\n debugLog(`Symbol property was deleted, returning false`)\n return false\n }\n }\n\n debugLog(`All properties match original values, returning true`)\n // All assigned properties match their original values\n return true\n }\n\n // Update parent status based on child changes\n function checkParentStatus(\n parentState: ChangeTracker<Record<string | symbol, unknown>>,\n childProp: string | symbol | unknown\n ) {\n debugLog(`checkParentStatus called for child prop:`, childProp)\n\n // Check if all properties of the parent are reverted\n const isReverted = checkIfReverted(parentState)\n debugLog(`Parent checkIfReverted returned:`, isReverted)\n\n if (isReverted) {\n debugLog(`Parent is fully reverted, clearing tracking`)\n // If everything is reverted, clear the tracking\n parentState.modified = false\n parentState.assigned_ = {}\n\n // Continue up the chain\n if (parentState.parent) {\n debugLog(`Continuing up the parent chain`)\n checkParentStatus(parentState.parent.tracker, parentState.parent.prop)\n }\n }\n }\n\n // Create a proxy for the target object\n function createObjectProxy<TObj extends object>(obj: TObj): TObj {\n debugLog(`createObjectProxy`, obj)\n // If we've already created a proxy for this object, return it\n if (proxyCache.has(obj)) {\n debugLog(`proxyCache found match`)\n return proxyCache.get(obj) as TObj\n }\n\n // Create a proxy for the object\n const proxy = new Proxy(obj, {\n get(ptarget, prop) {\n debugLog(`get`, ptarget, prop)\n const value =\n changeTracker.copy_[prop as keyof T] ??\n changeTracker.originalObject[prop as keyof T]\n\n const originalValue = changeTracker.originalObject[prop as keyof T]\n\n debugLog(`value (at top of proxy get)`, value)\n\n // If it's a getter, return the value directly\n const desc = Object.getOwnPropertyDescriptor(ptarget, prop)\n if (desc?.get) {\n return value\n }\n\n // If the value is a function, bind it to the ptarget\n if (typeof value === `function`) {\n // For Array methods that modify the array\n if (Array.isArray(ptarget)) {\n const methodName = prop.toString()\n const modifyingMethods = new Set([\n `pop`,\n `push`,\n `shift`,\n `unshift`,\n `splice`,\n `sort`,\n `reverse`,\n `fill`,\n `copyWithin`,\n ])\n\n if (modifyingMethods.has(methodName)) {\n return function (...args: Array<unknown>) {\n const result = value.apply(changeTracker.copy_, args)\n markChanged(changeTracker)\n return result\n }\n }\n }\n\n // For Map and Set methods that modify the collection\n if (ptarget instanceof Map || ptarget instanceof Set) {\n const methodName = prop.toString()\n const modifyingMethods = new Set([\n `set`,\n `delete`,\n `clear`,\n `add`,\n `pop`,\n `push`,\n `shift`,\n `unshift`,\n `splice`,\n `sort`,\n `reverse`,\n ])\n\n if (modifyingMethods.has(methodName)) {\n return function (...args: Array<unknown>) {\n const result = value.apply(changeTracker.copy_, args)\n markChanged(changeTracker)\n return result\n }\n }\n\n // Handle iterator methods for Map and Set\n const iteratorMethods = new Set([\n `entries`,\n `keys`,\n `values`,\n `forEach`,\n Symbol.iterator,\n ])\n\n if (iteratorMethods.has(methodName) || prop === Symbol.iterator) {\n return function (this: unknown, ...args: Array<unknown>) {\n const result = value.apply(changeTracker.copy_, args)\n\n // For forEach, we need to wrap the callback to track changes\n if (methodName === `forEach`) {\n const callback = args[0]\n if (typeof callback === `function`) {\n // Replace the original callback with our wrapped version\n const wrappedCallback = function (\n this: unknown,\n // eslint-disable-next-line\n value: unknown,\n key: unknown,\n collection: unknown\n ) {\n // Call the original callback\n const cbresult = callback.call(\n this,\n value,\n key,\n collection\n )\n // Mark as changed since the callback might have modified the value\n markChanged(changeTracker)\n return cbresult\n }\n // Call forEach with our wrapped callback\n return value.apply(ptarget, [\n wrappedCallback,\n ...args.slice(1),\n ])\n }\n }\n\n // For iterators (entries, keys, values, Symbol.iterator)\n if (\n methodName === `entries` ||\n methodName === `values` ||\n methodName === Symbol.iterator.toString() ||\n prop === Symbol.iterator\n ) {\n // If it's an iterator, we need to wrap the returned iterator\n // to track changes when the values are accessed and potentially modified\n const originalIterator = result\n\n // For values() iterator on Maps, we need to create a value-to-key mapping\n const valueToKeyMap = new Map()\n if (methodName === `values` && ptarget instanceof Map) {\n // Build a mapping from value to key for reverse lookup\n // Use the copy_ (which is the current state) to build the mapping\n for (const [\n key,\n mapValue,\n ] of changeTracker.copy_.entries()) {\n valueToKeyMap.set(mapValue, key)\n }\n }\n\n // For Set iterators, we need to create an original-to-modified mapping\n const originalToModifiedMap = new Map()\n if (ptarget instanceof Set) {\n // Initialize with original values\n for (const setValue of changeTracker.copy_.values()) {\n originalToModifiedMap.set(setValue, setValue)\n }\n }\n\n // Create a proxy for the iterator that will mark changes when next() is called\n return {\n next() {\n const nextResult = originalIterator.next()\n\n // If we have a value and it's an object, we need to track it\n if (\n !nextResult.done &&\n nextResult.value &&\n typeof nextResult.value === `object`\n ) {\n // For entries, the value is a [key, value] pair\n if (\n methodName === `entries` &&\n Array.isArray(nextResult.value) &&\n nextResult.value.length === 2\n ) {\n // The value is at index 1 in the [key, value] pair\n if (\n nextResult.value[1] &&\n typeof nextResult.value[1] === `object`\n ) {\n const mapKey = nextResult.value[0]\n // Create a special parent tracker that knows how to update the Map\n const mapParent = {\n tracker: changeTracker,\n prop: mapKey,\n updateMap: (newValue: unknown) => {\n // Update the Map in the copy\n if (changeTracker.copy_ instanceof Map) {\n changeTracker.copy_.set(mapKey, newValue)\n }\n },\n }\n\n // Create a proxy for the value and replace it in the result\n const { proxy: valueProxy } =\n memoizedCreateChangeProxy(\n nextResult.value[1],\n mapParent\n )\n nextResult.value[1] = valueProxy\n }\n } else if (\n methodName === `values` ||\n methodName === Symbol.iterator.toString() ||\n prop === Symbol.iterator\n ) {\n // If the value is an object, create a proxy for it\n if (\n typeof nextResult.value === `object` &&\n nextResult.value !== null\n ) {\n // For Map values(), try to find the key using our mapping\n if (\n methodName === `values` &&\n ptarget instanceof Map\n ) {\n const mapKey = valueToKeyMap.get(nextResult.value)\n if (mapKey !== undefined) {\n // Create a special parent tracker for this Map value\n const mapParent = {\n tracker: changeTracker,\n prop: mapKey,\n updateMap: (newValue: unknown) => {\n // Update the Map in the copy\n if (changeTracker.copy_ instanceof Map) {\n changeTracker.copy_.set(mapKey, newValue)\n }\n },\n }\n\n const { proxy: valueProxy } =\n memoizedCreateChangeProxy(\n nextResult.value,\n mapParent\n )\n nextResult.value = valueProxy\n }\n } else if (ptarget instanceof Set) {\n // For Set, we need to track modifications and update the Set accordingly\n const setOriginalValue = nextResult.value\n const setParent = {\n tracker: changeTracker,\n prop: setOriginalValue, // Use the original value as the prop\n updateSet: (newValue: unknown) => {\n // Update the Set in the copy by removing old value and adding new one\n if (changeTracker.copy_ instanceof Set) {\n changeTracker.copy_.delete(setOriginalValue)\n changeTracker.copy_.add(newValue)\n // Update our mapping for future iterations\n originalToModifiedMap.set(\n setOriginalValue,\n newValue\n )\n }\n },\n }\n\n const { proxy: valueProxy } =\n memoizedCreateChangeProxy(\n nextResult.value,\n setParent\n )\n nextResult.value = valueProxy\n } else {\n // For other cases, use a symbol as a placeholder\n const tempKey = Symbol(`iterator-value`)\n const { proxy: valueProxy } =\n memoizedCreateChangeProxy(nextResult.value, {\n tracker: changeTracker,\n prop: tempKey,\n })\n nextResult.value = valueProxy\n }\n }\n }\n }\n\n return nextResult\n },\n [Symbol.iterator]() {\n return this\n },\n }\n }\n\n return result\n }\n }\n }\n return value.bind(ptarget)\n }\n\n // If the value is an object, create a proxy for it\n if (\n value &&\n typeof value === `object` &&\n !((value as any) instanceof Date) &&\n !((value as any) instanceof RegExp)\n ) {\n // Create a parent reference for the nested object\n const nestedParent = {\n tracker: changeTracker,\n prop: String(prop),\n }\n\n // Create a proxy for the nested object\n const { proxy: nestedProxy } = memoizedCreateChangeProxy(\n originalValue,\n nestedParent\n )\n\n // Cache the proxy\n proxyCache.set(value, nestedProxy)\n\n return nestedProxy\n }\n\n return value\n },\n\n set(_sobj, prop, value) {\n const currentValue = changeTracker.copy_[prop as keyof T]\n debugLog(\n `set called for property ${String(prop)}, current:`,\n currentValue,\n `new:`,\n value\n )\n\n // Only track the change if the value is actually different\n if (!deepEqual(currentValue, value)) {\n // Check if the new value is equal to the original value\n // Important: Use the originalObject to get the true original value\n const originalValue = changeTracker.originalObject[prop as keyof T]\n const isRevertToOriginal = deepEqual(value, originalValue)\n debugLog(\n `value:`,\n value,\n `original:`,\n originalValue,\n `isRevertToOriginal:`,\n isRevertToOriginal\n )\n\n if (isRevertToOriginal) {\n debugLog(`Reverting property ${String(prop)} to original value`)\n // If the value is reverted to its original state, remove it from changes\n delete changeTracker.assigned_[prop.toString()]\n\n // Make sure the copy is updated with the original value\n debugLog(`Updating copy with original value for ${String(prop)}`)\n changeTracker.copy_[prop as keyof T] = deepClone(originalValue)\n\n // Check if all properties in this object have been reverted\n debugLog(`Checking if all properties reverted`)\n const allReverted = checkIfReverted(changeTracker)\n debugLog(`All reverted:`, allReverted)\n\n if (allReverted) {\n debugLog(`All properties reverted, clearing tracking`)\n // If all have been reverted, clear tracking\n changeTracker.modified = false\n changeTracker.assigned_ = {}\n\n // If we're a nested object, check if the parent needs updating\n if (parent) {\n debugLog(`Updating parent for property:`, parent.prop)\n checkParentStatus(parent.tracker, parent.prop)\n }\n } else {\n // Some properties are still changed\n debugLog(`Some properties still changed, keeping modified flag`)\n changeTracker.modified = true\n }\n } else {\n debugLog(`Setting new value for property ${String(prop)}`)\n\n // Set the value on the copy\n changeTracker.copy_[prop as keyof T] = value\n\n // Track that this property was assigned - store using the actual property (symbol or string)\n changeTracker.assigned_[prop.toString()] = true\n\n // Mark this object and its ancestors as modified\n debugLog(`Marking object and ancestors as modified`, changeTracker)\n markChanged(changeTracker)\n }\n } else {\n debugLog(`Value unchanged, not tracking`)\n }\n\n return true\n },\n\n defineProperty(_ptarget, prop, descriptor) {\n // const result = Reflect.defineProperty(\n // changeTracker.copy_,\n // prop,\n // descriptor\n // )\n // if (result) {\n if (`value` in descriptor) {\n changeTracker.copy_[prop as keyof T] = deepClone(descriptor.value)\n changeTracker.assigned_[prop.toString()] = true\n markChanged(changeTracker)\n }\n // }\n // return result\n return true\n },\n\n deleteProperty(dobj, prop) {\n debugLog(`deleteProperty`, dobj, prop)\n const stringProp = typeof prop === `symbol` ? prop.toString() : prop\n\n if (stringProp in dobj) {\n // Check if the property exists in the original object\n const hadPropertyInOriginal =\n stringProp in changeTracker.originalObject\n\n // Delete the property from the copy\n // Use type assertion to tell TypeScript this is allowed\n delete (changeTracker.copy_ as Record<string | symbol, unknown>)[prop]\n\n // If the property didn't exist in the original object, removing it\n // should revert to the original state\n if (!hadPropertyInOriginal) {\n delete changeTracker.copy_[stringProp]\n delete changeTracker.assigned_[stringProp]\n\n // If this is the last change and we're not a nested object,\n // mark the object as unmodified\n if (\n Object.keys(changeTracker.assigned_).length === 0 &&\n Object.getOwnPropertySymbols(changeTracker.assigned_).length === 0\n ) {\n changeTracker.modified = false\n } else {\n // We still have changes, keep as modified\n changeTracker.modified = true\n }\n } else {\n // Mark this property as deleted\n changeTracker.assigned_[stringProp] = false\n changeTracker.copy_[stringProp as keyof T] = undefined as T[keyof T]\n markChanged(changeTracker)\n }\n }\n\n return true\n },\n })\n\n // Cache the proxy\n proxyCache.set(obj, proxy)\n\n return proxy\n }\n\n // Create a proxy for the target object\n const proxy = createObjectProxy(target)\n\n // Return the proxy and a function to get the changes\n return {\n proxy,\n getChanges: () => {\n debugLog(`getChanges called, modified:`, changeTracker.modified)\n debugLog(changeTracker)\n\n // First, check if the object is still considered modified\n if (!changeTracker.modified) {\n debugLog(`Object not modified, returning empty object`)\n return {}\n }\n\n // If we have a copy, return it directly\n // Check if valueObj is actually an object\n if (\n typeof changeTracker.copy_ !== `object` ||\n Array.isArray(changeTracker.copy_)\n ) {\n return changeTracker.copy_\n }\n\n if (Object.keys(changeTracker.assigned_).length === 0) {\n return changeTracker.copy_\n }\n\n const result: Record<string, any | undefined> = {}\n\n // Iterate through keys in keyObj\n for (const key in changeTracker.copy_) {\n // If the key's value is true and the key exists in valueObj\n if (\n changeTracker.assigned_[key] === true &&\n key in changeTracker.copy_\n ) {\n result[key] = changeTracker.copy_[key]\n }\n }\n debugLog(`Returning copy:`, result)\n return result as unknown as Record<string | symbol, unknown>\n },\n }\n}\n\n/**\n * Creates proxies for an array of objects and tracks changes to each\n *\n * @param targets Array of objects to proxy\n * @returns An object containing the array of proxies and a function to get all changes\n */\nexport function createArrayChangeProxy<T extends object>(\n targets: Array<T>\n): {\n proxies: Array<T>\n getChanges: () => Array<Record<string | symbol, unknown>>\n} {\n const proxiesWithChanges = targets.map((target) => createChangeProxy(target))\n\n return {\n proxies: proxiesWithChanges.map((p) => p.proxy),\n getChanges: () => proxiesWithChanges.map((p) => p.getChanges()),\n }\n}\n\n/**\n * Creates a proxy for an object, passes it to a callback function,\n * and returns the changes made by the callback\n *\n * @param target The object to proxy\n * @param callback Function that receives the proxy and can make changes to it\n * @returns The changes made to the object\n */\nexport function withChangeTracking<T extends object>(\n target: T,\n callback: (proxy: T) => void\n): Record<string | symbol, unknown> {\n const { proxy, getChanges } = createChangeProxy(target)\n\n callback(proxy)\n\n return getChanges()\n}\n\n/**\n * Creates proxies for an array of objects, passes them to a callback function,\n * and returns the changes made by the callback for each object\n *\n * @param targets Array of objects to proxy\n * @param callback Function that receives the proxies and can make changes to them\n * @returns Array of changes made to each object\n */\nexport function withArrayChangeTracking<T extends object>(\n targets: Array<T>,\n callback: (proxies: Array<T>) => void\n): Array<Record<string | symbol, unknown>> {\n const { proxies, getChanges } = createArrayChangeProxy(targets)\n\n callback(proxies)\n\n return 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