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perf(effect): optimize effect trigger for array length mutation (#761)

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guaijie 2020-02-22 12:17:30 +08:00 committed by GitHub
parent e9024bf1b7
commit 76c7f54269
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1 changed files with 8 additions and 7 deletions
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15
packages/reactivity/src/effect.ts
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@ -176,17 +176,18 @@ export function trigger(
}
const effects = new Set<ReactiveEffect>()
const computedRunners = new Set<ReactiveEffect>()
if (
type === TriggerOpTypes.CLEAR ||
(key === 'length' &&
isArray(target) &&
(newValue as number) < (oldValue as number))
) {
// collection being cleared or Array length mutation
if (type === TriggerOpTypes.CLEAR) {
// collection being cleared
// trigger all effects for target
depsMap.forEach(dep => {
addRunners(effects, computedRunners, dep)
})
} else if (key === 'length' && isArray(target)) {
depsMap.forEach((dep, key) => {
if (key === 'length' || key >= (newValue as number)) {
addRunners(effects, computedRunners, dep)
}
})
} else {
// schedule runs for SET | ADD | DELETE
if (key !== void 0) {