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perf: further tweak accessCache

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This commit is contained in:
Evan You
2019-10-17 22:29:51 -04:00
parent 7305f693b1
commit d179918001
2 changed files with 6 additions and 3 deletions
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7
packages/runtime-core/src/componentProxy.ts
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@@ -56,7 +56,7 @@ const enum AccessTypes {
export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
get(target: ComponentInternalInstance, key: string) {
const { renderContext, data, props, propsProxy, accessCache } = target
const { renderContext, data, props, propsProxy, accessCache, type } = target
// This getter gets called for every property access on the render context
// during render and is a major hotspot. The most expensive part of this
// is the multiple hasOwn() calls. It's much faster to do a simple property
@@ -79,7 +79,10 @@ export const PublicInstanceProxyHandlers: ProxyHandler<any> = {
accessCache[key] = AccessTypes.CONTEXT
return renderContext[key]
} else if (hasOwn(props, key)) {
accessCache[key] = AccessTypes.PROPS
// only cache props access if component has declared (thus stable) props
if (type.props != null) {
accessCache[key] = AccessTypes.PROPS
}
// return the value from propsProxy for ref unwrapping and readonly
return propsProxy![key]
} else if (key === '$el') {