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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 32x 32x 32x 32x 32x 32x 32x 32x 32x 32x 2x 247x 247x 247x 247x 247x 247x 2x 2x 2x 2x 2x 2x 247x 25x 25x 25x 9x 25x 247x 247x 247x 247x 247x 247x 247x 62x 62x 246x 11x 11x 185x 8x 8x 8x 13x 22x 15x 22x 2x 7x 4x 5x 1x 1x 13x 174x 165x 114x 114x 165x 51x 92x 92x 92x 92x 92x 92x 92x 92x 92x 92x 92x 92x 79x 13x 92x 92x 92x 92x 51x 166x 1x 1x 1x 247x 67x 67x 67x 67x 247x 247x 25x 25x 12x 12x 25x 247x 6x 6x 6x 6x 6x 6x 247x 8x 239x 247x 237x 237x 233x 237x 7x 7x 237x 159x 159x 159x 128x 113x 4x 109x 159x 153x 153x 153x 153x 153x 153x 153x 153x 153x 15x 138x 1x 137x 153x 153x 153x 134x 19x 153x 153x 153x 153x 153x 225x 70x 70x 237x 247x 233x 233x 247x 247x 208x 39x 247x 247x 299x 299x 25x 16x 25x 9x 9x 25x 25x 299x 247x 247x 247x 247x 247x 196x 16x 196x 180x 180x 247x 29x 50x 22x 22x 247x 247x 247x 247x 247x 2x 421x 421x 421x 421x 421x 240x 240x 367x 421x 2x 2x 179x 179x 418x 6x 418x 101x 180x 180x 169x 10x 24x 10x 72x 58x 75x 75x 58x 13x 9x 9x 13x 58x 179x 179x | import { EMPTY_OBJ, NOOP, hasChanged, isArray, isFunction, isMap, isObject, isPlainObject, isSet, remove, } from '@vue/shared' import { warn } from './warning' import type { ComputedRef } from './computed' import { ReactiveFlags } from './constants' import { type DebuggerOptions, EffectFlags, type EffectScheduler, ReactiveEffect, pauseTracking, resetTracking, } from './effect' import { isReactive, isShallow } from './reactive' import { type Ref, isRef } from './ref' import { getCurrentScope } from './effectScope' // These errors were transferred from `packages/runtime-core/src/errorHandling.ts` // to @vue/reactivity to allow co-location with the moved base watch logic, hence // it is essential to keep these values unchanged. export enum WatchErrorCodes { WATCH_GETTER = 2, WATCH_CALLBACK, WATCH_CLEANUP, } export type WatchEffect = (onCleanup: OnCleanup) => void export type WatchSource<T = any> = Ref<T, any> | ComputedRef<T> | (() => T) export type WatchCallback<V = any, OV = any> = ( value: V, oldValue: OV, onCleanup: OnCleanup, ) => any export type OnCleanup = (cleanupFn: () => void) => void export interface WatchOptions<Immediate = boolean> extends DebuggerOptions { immediate?: Immediate deep?: boolean | number once?: boolean scheduler?: WatchScheduler onWarn?: (msg: string, ...args: any[]) => void /** * @internal */ augmentJob?: (job: (...args: any[]) => void) => void /** * @internal */ call?: ( fn: Function | Function[], type: WatchErrorCodes, args?: unknown[], ) => void } export type WatchStopHandle = () => void export interface WatchHandle extends WatchStopHandle { pause: () => void resume: () => void stop: () => void } // initial value for watchers to trigger on undefined initial values const INITIAL_WATCHER_VALUE = {} export type WatchScheduler = (job: () => void, isFirstRun: boolean) => void const cleanupMap: WeakMap<ReactiveEffect, (() => void)[]> = new WeakMap() let activeWatcher: ReactiveEffect | undefined = undefined /** * Returns the current active effect if there is one. */ export function getCurrentWatcher(): ReactiveEffect<any> | undefined { return activeWatcher } /** * Registers a cleanup callback on the current active effect. This * registered cleanup callback will be invoked right before the * associated effect re-runs. * * @param cleanupFn - The callback function to attach to the effect's cleanup. * @param failSilently - if `true`, will not throw warning when called without * an active effect. * @param owner - The effect that this cleanup function should be attached to. * By default, the current active effect. */ export function onWatcherCleanup( cleanupFn: () => void, failSilently = false, owner: ReactiveEffect | undefined = activeWatcher, ): void { if (owner) { let cleanups = cleanupMap.get(owner) if (!cleanups) cleanupMap.set(owner, (cleanups = [])) cleanups.push(cleanupFn) } else if (__DEV__ && !failSilently) { warn( `onWatcherCleanup() was called when there was no active watcher` + ` to associate with.`, ) } } export function watch( source: WatchSource | WatchSource[] | WatchEffect | object, cb?: WatchCallback | null, options: WatchOptions = EMPTY_OBJ, ): WatchHandle { const { immediate, deep, once, scheduler, augmentJob, call } = options const warnInvalidSource = (s: unknown) => { ;(options.onWarn || warn)( `Invalid watch source: `, s, `A watch source can only be a getter/effect function, a ref, ` + `a reactive object, or an array of these types.`, ) } const reactiveGetter = (source: object) => { // traverse will happen in wrapped getter below if (deep) return source // for `deep: false | 0` or shallow reactive, only traverse root-level properties if (isShallow(source) || deep === false || deep === 0) return traverse(source, 1) // for `deep: undefined` on a reactive object, deeply traverse all properties return traverse(source) } let effect: ReactiveEffect let getter: () => any let cleanup: (() => void) | undefined let boundCleanup: typeof onWatcherCleanup let forceTrigger = false let isMultiSource = false if (isRef(source)) { getter = () => source.value forceTrigger = isShallow(source) } else if (isReactive(source)) { getter = () => reactiveGetter(source) forceTrigger = true } else if (isArray(source)) { isMultiSource = true forceTrigger = source.some(s => isReactive(s) || isShallow(s)) getter = () => source.map(s => { if (isRef(s)) { return s.value } else if (isReactive(s)) { return reactiveGetter(s) } else if (isFunction(s)) { return call ? call(s, WatchErrorCodes.WATCH_GETTER) : s() } else { __DEV__ && warnInvalidSource(s) } }) } else if (isFunction(source)) { if (cb) { // getter with cb getter = call ? () => call(source, WatchErrorCodes.WATCH_GETTER) : (source as () => any) } else { // no cb -> simple effect getter = () => { if (cleanup) { pauseTracking() try { cleanup() } finally { resetTracking() } } const currentEffect = activeWatcher activeWatcher = effect try { return call ? call(source, WatchErrorCodes.WATCH_CALLBACK, [boundCleanup]) : source(boundCleanup) } finally { activeWatcher = currentEffect } } } } else { getter = NOOP __DEV__ && warnInvalidSource(source) } if (cb && deep) { const baseGetter = getter const depth = deep === true ? Infinity : deep getter = () => traverse(baseGetter(), depth) } const scope = getCurrentScope() const watchHandle: WatchHandle = () => { effect.stop() if (scope && scope.active) { remove(scope.effects, effect) } } if (once && cb) { const _cb = cb cb = (...args) => { _cb(...args) watchHandle() } } let oldValue: any = isMultiSource ? new Array((source as []).length).fill(INITIAL_WATCHER_VALUE) : INITIAL_WATCHER_VALUE const job = (immediateFirstRun?: boolean) => { if ( !(effect.flags & EffectFlags.ACTIVE) || (!effect.dirty && !immediateFirstRun) ) { return } if (cb) { // watch(source, cb) const newValue = effect.run() if ( deep || forceTrigger || (isMultiSource ? (newValue as any[]).some((v, i) => hasChanged(v, oldValue[i])) : hasChanged(newValue, oldValue)) ) { // cleanup before running cb again if (cleanup) { cleanup() } const currentWatcher = activeWatcher activeWatcher = effect try { const args = [ newValue, // pass undefined as the old value when it's changed for the first time oldValue === INITIAL_WATCHER_VALUE ? undefined : isMultiSource && oldValue[0] === INITIAL_WATCHER_VALUE ? [] : oldValue, boundCleanup, ] call ? call(cb!, WatchErrorCodes.WATCH_CALLBACK, args) : // @ts-expect-error cb!(...args) oldValue = newValue } finally { activeWatcher = currentWatcher } } } else { // watchEffect effect.run() } } if (augmentJob) { augmentJob(job) } effect = new ReactiveEffect(getter) effect.scheduler = scheduler ? () => scheduler(job, false) : (job as EffectScheduler) boundCleanup = fn => onWatcherCleanup(fn, false, effect) cleanup = effect.onStop = () => { const cleanups = cleanupMap.get(effect) if (cleanups) { if (call) { call(cleanups, WatchErrorCodes.WATCH_CLEANUP) } else { for (const cleanup of cleanups) cleanup() } cleanupMap.delete(effect) } } if (__DEV__) { effect.onTrack = options.onTrack effect.onTrigger = options.onTrigger } // initial run if (cb) { if (immediate) { job(true) } else { oldValue = effect.run() } } else if (scheduler) { scheduler(job.bind(null, true), true) } else { effect.run() } watchHandle.pause = effect.pause.bind(effect) watchHandle.resume = effect.resume.bind(effect) watchHandle.stop = watchHandle return watchHandle } export function traverse( value: unknown, depth: number = Infinity, seen?: Set<unknown>, ): unknown { if (depth <= 0 || !isObject(value) || (value as any)[ReactiveFlags.SKIP]) { return value } seen = seen || new Set() if (seen.has(value)) { return value } seen.add(value) depth-- if (isRef(value)) { traverse(value.value, depth, seen) } else if (isArray(value)) { for (let i = 0; i < value.length; i++) { traverse(value[i], depth, seen) } } else if (isSet(value) || isMap(value)) { value.forEach((v: any) => { traverse(v, depth, seen) }) } else if (isPlainObject(value)) { for (const key in value) { traverse(value[key], depth, seen) } for (const key of Object.getOwnPropertySymbols(value)) { if (Object.prototype.propertyIsEnumerable.call(value, key)) { traverse(value[key as any], depth, seen) } } } return value } |