New root component doesn't work with Map

[JonathonRP]

Describe the bug

root component doesn't allow using map, works with object and key but Map is more performant for lookups.

Reproduction

make a map that can return a svelte component
then call with new dynamic element
<map.get(key) />

Logs

No response

System Info

svelte 5

Severity

annoyance

[MotionlessTrain]

Only variable names and object properties are allowed there, not all expressions

You can instead do

{@const Widget = widgets.get(widget)}
<Widget />

Or define Widget within the script tag, if both widgets and widget are available there

[JonathonRP]

yeah currently doing that for workaround, is there a design reason for not allowing maps, do you know?

[MotionlessTrain]

They needed to draw a line somewhere:
#12821 (comment)

[JonathonRP]

yeah, that stinks. I would have said the line should be after maps, they are common but yeah not much to do.