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Decrease expiration time of input updates #19772

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Sep 4, 2020
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Decrease expiration time of input updates #19772

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16 changes: 15 additions & 1 deletion packages/react-reconciler/src/ReactFiberLane.js
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Original file line number Diff line number Diff line change
Expand Up @@ -384,7 +384,21 @@ function computeExpirationTime(lane: Lane, currentTime: number) {
const priority = return_highestLanePriority;
if (priority >= InputContinuousLanePriority) {
// User interactions should expire slightly more quickly.
return currentTime + 1000;
//
// NOTE: This is set to the corresponding constant as in Scheduler.js. When
// we made it larger, a product metric in www regressed, suggesting there's
// a user interaction that's being starved by a series of synchronous
// updates. If that theory is correct, the proper solution is to fix the
// starvation. However, this scenario supports the idea that expiration
// times are an important safeguard when starvation does happen.
//
// Also note that, in the case of user input specifically, this will soon no
// longer be an issue because we plan to make user input synchronous by
// default (until you enter `startTransition`, of course.)
//
// If weren't planning to make these updates synchronous soon anyway, I
// would probably make this number a configurable parameter.
return currentTime + 250;
} else if (priority >= TransitionPriority) {
return currentTime + 5000;
} else {
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