[bug]: Imperative .start() doesn't account for delay

[varunarora]

Which react-spring target are you using?

• [X] @react-spring/web
• [ ] @react-spring/three
• [ ] @react-spring/native
• [ ] @react-spring/konva
• [ ] @react-spring/zdog

What version of react-spring are you using?

9.0.0

What's Wrong?

I have a spring which should be delayed when called through the imperative .start(). But it seems like the delay value gets ignored. Is this expected? Is this by design?

To Reproduce

const [springProps, animate] = useSpring(() => ({
   from: { opacity: 0 },
   to: { opacity: 1 },
   delay: 5000
})

// Bunch of code later

animate.start()

Expected Behaviour

When .start() is called, a delay happens before the animation triggers.

Link to repo

[joshuaellis]

Hey, does this still happen with the latest version?

Also, please provide a codesandbox repro of the issue you're facing.

[varunarora]

Haven't tried with the latest version, Joshua. Will make a codesandbox for it.

[varunarora]

Still happens with the latest version.

Code sandbox is here: https://codesandbox.io/s/amazing-moon-kf0wop?file=/src/App.js

This might not be a bug. I may have misunderstood .start(). I thought it preserved the original props (not just from and to, but also things like delay and config), and merged in new props. But it seems like it will only work when I re-introduce the delay prop value in the mergeable object.