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type Target,
isReadonly,
isShallow,
reactive,
reactiveMap,
readonly,
readonlyMap,
shallowReactiveMap,
shallowReadonlyMap,
toRaw,
} from './reactive'
import { arrayInstrumentations } from './arrayInstrumentations'
import { ReactiveFlags, TrackOpTypes, TriggerOpTypes } from './constants'
import { ITERATE_KEY, track, trigger } from './dep'
import {
hasChanged,
hasOwn,
isArray,
isIntegerKey,
isObject,
isSymbol,
makeMap,
} from '@vue/shared'
import { isRef } from './ref'
import { warn } from './warning'
const isNonTrackableKeys = /*@__PURE__*/ makeMap(`__proto__,__v_isRef,__isVue`)
const builtInSymbols = new Set(
/*@__PURE__*/
Object.getOwnPropertyNames(Symbol)
// ios10.x Object.getOwnPropertyNames(Symbol) can enumerate 'arguments' and 'caller'
// but accessing them on Symbol leads to TypeError because Symbol is a strict mode
// function
.filter(key => key !== 'arguments' && key !== 'caller')
.map(key => Symbol[key as keyof SymbolConstructor])
.filter(isSymbol),
)
function hasOwnProperty(this: object, key: unknown) {
// #10455 hasOwnProperty may be called with non-string values
if (!isSymbol(key)) key = String(key)
const obj = toRaw(this)
track(obj, TrackOpTypes.HAS, key)
return obj.hasOwnProperty(key as string)
}
class BaseReactiveHandler implements ProxyHandler<Target> {
constructor(
protected readonly _isReadonly = false,
protected readonly _isShallow = false,
) {}
get(target: Target, key: string | symbol, receiver: object): any {
const isReadonly = this._isReadonly,
isShallow = this._isShallow
if (key === ReactiveFlags.IS_REACTIVE) {
return !isReadonly
} else if (key === ReactiveFlags.IS_READONLY) {
return isReadonly
} else if (key === ReactiveFlags.IS_SHALLOW) {
return isShallow
} else if (key === ReactiveFlags.RAW) {
if (
receiver ===
(isReadonly
? isShallow
? shallowReadonlyMap
: readonlyMap
: isShallow
? shallowReactiveMap
: reactiveMap
).get(target) ||
// receiver is not the reactive proxy, but has the same prototype
// this means the receiver is a user proxy of the reactive proxy
Object.getPrototypeOf(target) === Object.getPrototypeOf(receiver)
) {
return target
}
// early return undefined
return
}
const targetIsArray = isArray(target)
if (!isReadonly) {
let fn: Function | undefined
if (targetIsArray && (fn = arrayInstrumentations[key])) {
return fn
}
if (key === 'hasOwnProperty') {
return hasOwnProperty
}
}
const res = Reflect.get(
target,
key,
// if this is a proxy wrapping a ref, return methods using the raw ref
// as receiver so that we don't have to call `toRaw` on the ref in all
// its class methods
isRef(target) ? target : receiver,
)
if (isSymbol(key) ? builtInSymbols.has(key) : isNonTrackableKeys(key)) {
return res
}
if (!isReadonly) {
track(target, TrackOpTypes.GET, key)
}
if (isShallow) {
return res
}
if (isRef(res)) {
// ref unwrapping - skip unwrap for Array + integer key.
return targetIsArray && isIntegerKey(key) ? res : res.value
}
if (isObject(res)) {
// Convert returned value into a proxy as well. we do the isObject check
// here to avoid invalid value warning. Also need to lazy access readonly
// and reactive here to avoid circular dependency.
return isReadonly ? readonly(res) : reactive(res)
}
return res
}
}
class MutableReactiveHandler extends BaseReactiveHandler {
constructor(isShallow = false) {
super(false, isShallow)
}
set(
target: Record<string | symbol, unknown>,
key: string | symbol,
value: unknown,
receiver: object,
): boolean {
let oldValue = target[key]
if (!this._isShallow) {
const isOldValueReadonly = isReadonly(oldValue)
if (!isShallow(value) && !isReadonly(value)) {
oldValue = toRaw(oldValue)
value = toRaw(value)
}
if (!isArray(target) && isRef(oldValue) && !isRef(value)) {
if (isOldValueReadonly) {
return false
} else {
oldValue.value = value
return true
}
}
} else {
// in shallow mode, objects are set as-is regardless of reactive or not
}
const hadKey =
isArray(target) && isIntegerKey(key)
? Number(key) < target.length
: hasOwn(target, key)
const result = Reflect.set(
target,
key,
value,
isRef(target) ? target : receiver,
)
// don't trigger if target is something up in the prototype chain of original
if (target === toRaw(receiver)) {
if (!hadKey) {
trigger(target, TriggerOpTypes.ADD, key, value)
} else if (hasChanged(value, oldValue)) {
trigger(target, TriggerOpTypes.SET, key, value, oldValue)
}
}
return result
}
deleteProperty(
target: Record<string | symbol, unknown>,
key: string | symbol,
): boolean {
const hadKey = hasOwn(target, key)
const oldValue = target[key]
const result = Reflect.deleteProperty(target, key)
if (result && hadKey) {
trigger(target, TriggerOpTypes.DELETE, key, undefined, oldValue)
}
return result
}
has(target: Record<string | symbol, unknown>, key: string | symbol): boolean {
const result = Reflect.has(target, key)
if (!isSymbol(key) || !builtInSymbols.has(key)) {
track(target, TrackOpTypes.HAS, key)
}
return result
}
ownKeys(target: Record<string | symbol, unknown>): (string | symbol)[] {
track(
target,
TrackOpTypes.ITERATE,
isArray(target) ? 'length' : ITERATE_KEY,
)
return Reflect.ownKeys(target)
}
}
class ReadonlyReactiveHandler extends BaseReactiveHandler {
constructor(isShallow = false) {
super(true, isShallow)
}
set(target: object, key: string | symbol) {
if (__DEV__) {
warn(
`Set operation on key "${String(key)}" failed: target is readonly.`,
target,
)
}
return true
}
deleteProperty(target: object, key: string | symbol) {
if (__DEV__) {
warn(
`Delete operation on key "${String(key)}" failed: target is readonly.`,
target,
)
}
return true
}
}
export const mutableHandlers: ProxyHandler<object> =
/*@__PURE__*/ new MutableReactiveHandler()
export const readonlyHandlers: ProxyHandler<object> =
/*@__PURE__*/ new ReadonlyReactiveHandler()
export const shallowReactiveHandlers: MutableReactiveHandler =
/*@__PURE__*/ new MutableReactiveHandler(true)
// Props handlers are special in the sense that it should not unwrap top-level
// refs (in order to allow refs to be explicitly passed down), but should
// retain the reactivity of the normal readonly object.
export const shallowReadonlyHandlers: ReadonlyReactiveHandler =
/*@__PURE__*/ new ReadonlyReactiveHandler(true)
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