@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\nimport { deepEqualsInternal, isTemporal } from './utils'\n\n// Resolve draft handles before calling native Map/Set membership methods.\nconst draftCopies = new WeakMap<object, object>()\nfunction defineDataProperty(\n object: object,\n key: PropertyKey,\n value: unknown,\n): void {\n if (key !== `__proto__`) {\n ;(object as Record<PropertyKey, unknown>)[key] = value\n return\n }\n Object.defineProperty(object, key, {\n value,\n enumerable: true,\n configurable: true,\n writable: true,\n })\n}\n\nfunction unwrapDraft(value: unknown): unknown {\n return value !== null && typeof value === `object`\n ? (draftCopies.get(value) ?? value)\n : value\n}\n\n/**\n * Array and typed-array methods that modify the value in place.\n */\nconst ARRAY_MODIFYING_METHODS = new Set([\n `pop`,\n `push`,\n `shift`,\n `unshift`,\n `splice`,\n `sort`,\n `reverse`,\n `fill`,\n `copyWithin`,\n `set`,\n])\n\n/**\n * Set of Map/Set iterator methods.\n */\nconst MAP_SET_ITERATOR_METHODS = new Set([\n `entries`,\n `keys`,\n `values`,\n `forEach`,\n])\n\n/**\n * Check if a value is a proxiable object (not Date, RegExp, or Temporal)\n */\nfunction isProxiableObject(\n value: unknown,\n): value is Record<string | symbol, unknown> {\n return (\n value !== null &&\n typeof value === `object` &&\n !((value as any) instanceof Date) &&\n !((value as any) instanceof RegExp) &&\n !isTemporal(value)\n )\n}\n\n/**\n * Creates a wrapper for methods that modify a collection (array, Map, Set).\n * The wrapper calls the method and marks the change tracker as modified.\n */\nfunction createModifyingMethodHandler<T extends object>(\n methodFn: (...args: Array<unknown>) => unknown,\n changeTracker: ChangeTracker<T>,\n markChanged: (tracker: ChangeTracker<T>) => void,\n receiver: unknown,\n): (...args: Array<unknown>) => unknown {\n return function (...args: Array<unknown>) {\n const result = methodFn.apply(changeTracker.copy_, args)\n markChanged(changeTracker)\n // A method that returns the value itself returns the draft.\n return result === changeTracker.copy_ ? receiver : result\n }\n}\n\n/**\n * Use the native live iterator, but expose tracked values. Editing an entry\n * changes its owned draft copy in place; it must not delete/reinsert a Set slot.\n */\nfunction createMapSetIteratorHandler<T extends object>(\n methodName: string,\n prop: string | symbol,\n changeTracker: ChangeTracker<T>,\n collectionProxy: unknown,\n memoizedCreateChangeProxy: (\n obj: Record<string | symbol, unknown>,\n parent?: ChangeParent,\n ) => { proxy: Record<string | symbol, unknown> },\n): ((...args: Array<unknown>) => unknown) | undefined {\n if (!MAP_SET_ITERATOR_METHODS.has(methodName) && prop !== Symbol.iterator) {\n return undefined\n }\n\n return (...args) => {\n const copy = changeTracker.copy_ as Map<unknown, unknown> | Set<unknown>\n const isMap = copy instanceof Map\n if (isMap && methodName === `keys`) return copy.keys()\n\n const track = (value: unknown) =>\n isProxiableObject(value)\n ? memoizedCreateChangeProxy(value, {\n tracker: changeTracker as unknown as ChangeTracker<\n Record<string | symbol, unknown>\n >,\n prop: ``,\n retainIdentity: true,\n }).proxy\n : value\n\n if (methodName === `forEach`) {\n const callback = args[0]\n if (typeof callback !== `function`)\n throw new TypeError(`forEach callback must be a function`)\n return copy.forEach((value, key) => {\n const tracked = track(value)\n callback.call(args[1], tracked, isMap ? key : tracked, collectionProxy)\n })\n }\n\n const entries = copy.entries()\n const pairs =\n methodName === `entries` || (isMap && prop === Symbol.iterator)\n return {\n next() {\n const result = entries.next()\n if (result.done) return result\n const [key, value] = result.value\n const tracked = track(value)\n return {\n done: false,\n value: pairs ? [isMap ? key : tracked, tracked] : tracked,\n }\n },\n [Symbol.iterator]() {\n return this\n },\n }\n }\n}\n\n// Update type for ChangeTracker\ninterface ChangeParent {\n tracker: ChangeTracker<Record<string | symbol, unknown>>\n prop: string | symbol\n // Map/Set entries already belong to the parent's private copy.\n retainIdentity?: boolean\n}\n\ninterface ChangeTracker<T extends object> {\n valueCopies: WeakMap<object, unknown>\n originalObject: T\n modified: boolean\n copy_: T\n assigned_: Record<string | symbol, boolean>\n parent?: ChangeParent\n target: T\n}\n\n/**\n * Deep clones an object while preserving special types like Date and RegExp\n */\n\ninterface TypedArray {\n length: number\n set: (source: TypedArray) => void\n}\n\nfunction deepClone<T extends unknown>(\n obj: T,\n visited = new WeakMap<object, unknown>(),\n detach = false,\n): T {\n // A draft handle and its underlying copy must share one cycle identity.\n obj = unwrapDraft(obj) as 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 const clone = new Date(obj.getTime())\n visited.set(obj, clone)\n return clone as T\n }\n\n if (obj instanceof RegExp) {\n const clone = new RegExp(obj.source, obj.flags)\n clone.lastIndex = obj.lastIndex\n visited.set(obj, clone)\n return clone as T\n }\n\n if (obj instanceof URL) {\n const clone = new URL(obj.href)\n visited.set(obj, clone)\n return clone as T\n }\n\n if (Array.isArray(obj)) {\n const arrayClone = new Array<unknown>(obj.length)\n visited.set(obj as object, arrayClone)\n obj.forEach((item, index) => {\n arrayClone[index] = deepClone(item, visited, detach)\n })\n return arrayClone as unknown as T\n }\n\n // Handle TypedArrays\n if (ArrayBuffer.isView(obj) && !(obj instanceof DataView)) {\n // Create an instance of the same type by length, then copy the values.\n // A subclass constructor need not forward a source array to super.\n const TypedArrayConstructor = Object.getPrototypeOf(obj).constructor\n const clone = new TypedArrayConstructor(\n (obj as unknown as TypedArray).length,\n ) as TypedArray\n visited.set(obj as object, clone)\n clone.set(obj as unknown as TypedArray)\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, detach))\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, detach))\n })\n return clone as unknown as T\n }\n\n // Handle Temporal objects\n if (isTemporal(obj)) {\n // Temporal objects are immutable, so we can return them directly\n // This preserves all their internal state correctly\n return obj\n }\n\n // Arbitrary instances may carry private/native state we cannot reconstruct.\n // Keep them by reference at publication, rather than silently flattening them.\n if (detach) {\n const prototype = Object.getPrototypeOf(obj)\n if (prototype !== Object.prototype && prototype !== null) return obj\n }\n\n const clone = {} as Record<string | symbol, unknown>\n visited.set(obj as object, clone)\n\n // Own enumerable string keys and every own symbol key, in native order.\n for (const key of Reflect.ownKeys(obj)) {\n if (\n typeof key === `symbol` ||\n Object.prototype.propertyIsEnumerable.call(obj, key)\n ) {\n // Copy data properties without invoking Object.prototype.__proto__.\n defineDataProperty(\n clone,\n key,\n deepClone(\n (obj as Record<string | symbol, unknown>)[key],\n visited,\n detach,\n ),\n )\n }\n }\n\n return clone as T\n}\n\n// Generic value equality intentionally ignores some native state. Draft\n// assignments must also preserve Set contents/order and RegExp match position.\nfunction draftValuesEqual(\n left: unknown,\n right: unknown,\n paired?: Map<object, object>,\n): boolean {\n return deepEqualsInternal(left, right, paired, true)\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?: ChangeParent,\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?: ChangeParent,\n ): {\n proxy: TInner\n getChanges: () => Record<string | symbol, any>\n } {\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 // Existing values share one private copy per row. Newly inserted objects\n // retain normal references during the callback; the result is detached below.\n const valueCopies =\n parent?.tracker.valueCopies ?? new WeakMap<object, unknown>()\n const changeTracker: ChangeTracker<T> = {\n valueCopies,\n copy_: parent\n ? ((valueCopies.get(target) ?? target) as T)\n : deepClone(target, valueCopies),\n // The root target is the stored row, which the draft never writes, so it\n // is its own baseline. A nested target is a draft copy that writes reach.\n originalObject: parent ? deepClone(target) : target,\n modified: false,\n assigned_: Object.create(null),\n parent,\n target, // Store reference to the target object\n }\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 if (\n !state.parent.retainIdentity &&\n state.parent.tracker.copy_[state.parent.prop] === state.copy_\n ) {\n // Only mark an edge that still points to this child. A retained handle\n // must not reinstall itself after the callback replaces or deletes it.\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 // assigned_ keys are always strings: traps record `prop.toString()`.\n function checkIfReverted(\n state: ChangeTracker<Record<string | symbol, unknown>>,\n ): boolean {\n if (state.copy_ instanceof Map || state.copy_ instanceof Set) {\n // Compare entry contents: these containers have no assigned properties.\n return draftValuesEqual(\n Array.from(state.copy_),\n Array.from(\n state.originalObject as unknown as\n | Map<unknown, unknown>\n | Set<unknown>,\n ),\n )\n }\n for (const prop in state.assigned_) {\n // false marks a deletion, which always differs from the original. A key\n // added with the value undefined differs from an absent key.\n if (\n !state.assigned_[prop] ||\n Object.hasOwn(state.copy_, prop) !==\n Object.hasOwn(state.originalObject, prop) ||\n !draftValuesEqual(\n state.copy_[prop],\n (state.originalObject as any)[prop],\n )\n ) {\n return false\n }\n }\n return true\n }\n\n // Update parent status based on child changes\n function checkParentStatus(\n parentState: ChangeTracker<Record<string | symbol, unknown>>,\n ) {\n // Check if all properties of the parent are reverted\n const isReverted = checkIfReverted(parentState)\n\n if (isReverted) {\n // If everything is reverted, clear the tracking\n parentState.modified = false\n parentState.assigned_ = Object.create(null)\n\n // Continue up the chain. The parent's edge to this object no longer\n // counts as a change when the parent's value equals its original; a\n // replaced object can revert to its own snapshot and still differ.\n const edge = parentState.parent\n if (edge) {\n if (\n draftValuesEqual(\n edge.tracker.copy_[edge.prop],\n edge.tracker.originalObject[edge.prop],\n )\n )\n delete edge.tracker.assigned_[edge.prop]\n checkParentStatus(edge.tracker)\n }\n }\n }\n\n // Create a proxy for the target object.\n // Use the unfrozen copy_ as the proxy target to avoid Proxy invariant violations\n // when the original target is frozen (e.g., from Immer)\n // Whether a value equals the original's own value for a field.\n function isOriginalValue(prop: string | symbol, value: unknown): boolean {\n const original = changeTracker.originalObject\n return (\n Object.hasOwn(original, prop) &&\n draftValuesEqual(value, original[prop as keyof T])\n )\n }\n\n // Records a write the draft now holds. Assignment and defineProperty share\n // it so they report the same change.\n function recordWrite(prop: string | symbol, reverted: boolean) {\n if (reverted) {\n delete changeTracker.assigned_[prop.toString()]\n // Some properties may still be changed; checkParentStatus clears\n // tracking here and up the chain once everything is reverted.\n changeTracker.modified = true\n checkParentStatus(changeTracker)\n } else {\n changeTracker.assigned_[prop.toString()] = true\n markChanged(changeTracker)\n }\n }\n\n const proxy = new Proxy(changeTracker.copy_, {\n get(ptarget, prop, receiver) {\n const value = changeTracker.copy_[prop as keyof T]\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 // The Proxy invariants require a read-only non-configurable value as\n // stored, as after Object.freeze. A raw object can still be written\n // through, so its key counts as changed.\n if (desc?.configurable === false && !desc.writable) {\n if (isProxiableObject(value)) {\n changeTracker.assigned_[String(prop)] = true\n markChanged(changeTracker)\n }\n return value\n }\n\n // If the value is a function, bind it to the ptarget\n if (typeof value === `function`) {\n // A function stored as data is returned as stored, like any value. A\n // call then sees the draft as `this`, so its writes are tracked. A\n // constructor is not a method. Only inherited methods (Array, Map,\n // Set) need the handling below.\n if (Object.hasOwn(ptarget, prop) || prop === `constructor`) return value\n\n const methodName = prop.toString()\n\n // A subarray shares the buffer, so it is a draft whose writes mark\n // this value changed, like a Map value.\n if (methodName === `subarray` && ArrayBuffer.isView(ptarget)) {\n return (...args: Array<unknown>) =>\n memoizedCreateChangeProxy(value.apply(ptarget, args), {\n tracker: changeTracker,\n prop: ``,\n retainIdentity: true,\n }).proxy\n }\n\n // Array and typed-array methods that modify the value in place\n if (\n ARRAY_MODIFYING_METHODS.has(methodName) &&\n (Array.isArray(ptarget) || ArrayBuffer.isView(ptarget))\n ) {\n return createModifyingMethodHandler(\n value,\n changeTracker,\n markChanged,\n receiver,\n )\n }\n\n if (Array.isArray(ptarget)) {\n // Other methods, iterators included, read through the draft\n // itself, so returned and callback elements are drafts and searches\n // find them. This also tracks the callback array and implicit\n // reduce seed.\n return value.bind(receiver)\n }\n\n // For Map and Set methods that modify the collection\n if (ptarget instanceof Map || ptarget instanceof Set) {\n const resolveValue = (entry: unknown) => {\n const raw = unwrapDraft(entry)\n return raw !== null && typeof raw === `object`\n ? (valueCopies.get(raw) ?? raw)\n : raw\n }\n\n if (\n methodName === `has` ||\n methodName === `delete` ||\n methodName === `add` ||\n methodName === `set`\n ) {\n return (...args: Array<unknown>) => {\n if (ptarget instanceof Set) args[0] = resolveValue(args[0])\n else if (methodName === `set`) args[1] = resolveValue(args[1])\n const result = value.apply(ptarget, args)\n if (methodName !== `has`) markChanged(changeTracker)\n return result === ptarget ? receiver : result\n }\n }\n\n if (ptarget instanceof Map && methodName === `get`) {\n return (key: unknown) => {\n const entry = ptarget.get(key)\n return isProxiableObject(entry)\n ? memoizedCreateChangeProxy(entry, {\n tracker: changeTracker,\n prop: ``,\n retainIdentity: true,\n }).proxy\n : entry\n }\n }\n\n if (methodName === `clear`) {\n return createModifyingMethodHandler(\n value,\n changeTracker,\n markChanged,\n receiver,\n )\n }\n\n // Handle iterator methods for Map and Set\n const iteratorHandler = createMapSetIteratorHandler(\n methodName,\n prop,\n changeTracker,\n receiver,\n memoizedCreateChangeProxy,\n )\n if (iteratorHandler) {\n return iteratorHandler\n }\n }\n return value.bind(ptarget)\n }\n\n // If the value is an object (but not Date, RegExp, or Temporal), create a proxy for it\n if (isProxiableObject(value)) {\n // Create a parent reference for the nested object\n const nestedParent = {\n tracker: changeTracker,\n prop: String(prop),\n }\n\n // Create (or reuse) the proxy for the nested object\n return memoizedCreateChangeProxy(value, nestedParent).proxy\n }\n\n return value\n },\n\n set(ptarget, prop, value) {\n // An accessor the callback defined behaves as on a plain object; a\n // getter without a setter rejects even a write of its own value.\n if (Reflect.getOwnPropertyDescriptor(ptarget, prop)?.get) {\n return Reflect.set(ptarget, prop, value)\n }\n const currentValue = changeTracker.copy_[prop as keyof T]\n\n // Only track the change if the value is actually different\n if (\n !Object.hasOwn(changeTracker.copy_, prop) ||\n !draftValuesEqual(currentValue, value)\n ) {\n const reverted = isOriginalValue(prop, value)\n // A revert restores a copy so the draft never aliases the row.\n changeTracker.copy_[prop as keyof T] = reverted\n ? deepClone(changeTracker.originalObject[prop as keyof T])\n : value\n recordWrite(prop, reverted)\n }\n\n return true\n },\n\n defineProperty(ptarget, prop, descriptor) {\n // Forward the defineProperty to the target to maintain Proxy invariants\n // This allows Object.seal() and Object.freeze() to work on the proxy\n const result = Reflect.defineProperty(ptarget, prop, descriptor)\n // A value or an accessor changes what the key reads, counted by the\n // value it reads as an assignment would be. Sealing does not.\n if (\n result &&\n (`value` in descriptor || descriptor.get || descriptor.set)\n ) {\n recordWrite(prop, isOriginalValue(prop, Reflect.get(ptarget, prop)))\n }\n return result\n },\n\n getOwnPropertyDescriptor(ptarget, prop) {\n // Forward to target to maintain Proxy invariants for seal/freeze\n return Reflect.getOwnPropertyDescriptor(ptarget, prop)\n },\n\n preventExtensions(ptarget) {\n // Forward to target to allow Object.seal() and Object.preventExtensions()\n return Reflect.preventExtensions(ptarget)\n },\n\n isExtensible(ptarget) {\n // Forward to target to maintain consistency\n return Reflect.isExtensible(ptarget)\n },\n\n deleteProperty(dobj, prop) {\n const stringProp = typeof prop === `symbol` ? prop.toString() : prop\n\n if (Object.hasOwn(dobj, prop)) {\n // A hidden original field is not row data, so as with a plain\n // delete of it, removing it is not a change.\n const hadPropertyInOriginal =\n Object.prototype.propertyIsEnumerable.call(\n changeTracker.originalObject,\n prop,\n )\n\n // Forward the delete to the target using Reflect\n // This respects Object.seal/preventExtensions constraints\n const result = Reflect.deleteProperty(dobj, prop)\n\n if (result) {\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.assigned_[stringProp]\n\n // Deleting an added key is a revert. Like the set trap, clear\n // tracking here and up the chain once everything is reverted.\n changeTracker.modified = true\n checkParentStatus(changeTracker)\n } else {\n // Mark this property as deleted\n changeTracker.assigned_[stringProp] = false\n markChanged(changeTracker)\n }\n }\n\n return result\n }\n\n return true\n },\n })\n draftCopies.set(proxy, changeTracker.copy_)\n\n // Return the proxy and a function to get the changes\n return {\n proxy,\n getChanges: () => {\n // First, check if the object is still considered modified\n if (!changeTracker.modified) {\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 const mayHaveChangedAliases = Object.keys(changeTracker.assigned_).some(\n (key) =>\n typeof changeTracker.copy_[key] === `object` ||\n typeof changeTracker.originalObject[key] === `object`,\n )\n const pairedRoots = new Map<object, object>([\n [changeTracker.copy_, changeTracker.originalObject],\n ])\n\n // Iterate through keys in keyObj\n for (const key in changeTracker.copy_) {\n const value: unknown = changeTracker.copy_[key]\n const original: unknown = changeTracker.originalObject[key]\n // Compare child contents, stopping only at paired root backedges. A\n // child's own changes still count even when it also points to this row.\n if (\n changeTracker.assigned_[key] === true ||\n (mayHaveChangedAliases &&\n !draftValuesEqual(\n value instanceof Set ? Array.from(value) : value,\n original instanceof Set ? Array.from(original) : original,\n pairedRoots,\n ))\n ) {\n defineDataProperty(result, key, changeTracker.copy_[key])\n }\n }\n\n for (const key of Object.keys(changeTracker.assigned_)) {\n if (changeTracker.assigned_[key] === false) {\n defineDataProperty(result, key, undefined)\n }\n }\n\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 deepClone(getChanges(), undefined, true)\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 deepClone(getChanges(), undefined, true)\n}\n\n// Whether every own field of a plain object holds a primitive or a function.\nfunction isFlatPlainObject(value: object): boolean {\n const prototype = Object.getPrototypeOf(value)\n if (prototype !== Object.prototype && prototype !== null) return false\n for (const key in value) {\n // A getter may return a new value on each read; the proxy reads it once.\n const { value: field, get } = Object.getOwnPropertyDescriptor(value, key)!\n if (get || (field !== null && typeof field === `object`)) return false\n }\n return Object.getOwnPropertySymbols(value).length === 0\n}\n\n/**\n * Change tracking for flat rows without proxies. A draft is a shallow copy,\n * and its changes are the fields that differ from the row afterwards under\n * the same equality the draft proxy uses for primitives. Returns undefined\n * when any row has a nested object, a getter, a symbol key, or a class\n * prototype, so the caller falls back to the proxy.\n */\nexport function withFlatChangeTracking<T extends object>(\n targets: Array<T>,\n callback: (drafts: Array<T> | T) => void,\n asArray: boolean,\n): Array<Record<string, unknown>> | undefined {\n if (!targets.every(isFlatPlainObject)) return undefined\n const drafts = targets.map((target) => ({ ...target }))\n callback(asArray ? drafts : drafts[0]!)\n return drafts.map((draft, index) => {\n const original = targets[index] as Record<string, unknown>\n const changes: Record<string, unknown> = {}\n let assignedObject = false\n for (const key in draft) {\n const value = (draft as Record<string, unknown>)[key]\n const before = original[key]\n // Only a hidden field can hold an object; compare it as the proxy does.\n if (\n !Object.hasOwn(original, key) ||\n !(\n value === before ||\n Object.is(value, before) ||\n (typeof before === `object` &&\n before !== null &&\n draftValuesEqual(value, before))\n )\n ) {\n defineDataProperty(changes, key, value)\n if (value !== null && typeof value === `object`) assignedObject = true\n }\n }\n for (const key in original) {\n if (!Object.hasOwn(draft, key))\n defineDataProperty(changes, key, undefined)\n }\n // A callback may assign objects; detach them as the proxy path does.\n return assignedObject ? deepClone(changes, undefined, true) : changes\n 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