Svelte 5: Certain patterns of lazily loaded components fail

[Conduitry]

Describe the bug

The particular pattern below of lazily loading components fails, telling me that the lazily loaded component variable is not a function. This works in v4 and worked in previous versions of v5 (although I haven't checked when exactly it broke).

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACpWRW0vEMBCF_8oQH7aFpX3vDcTX_QdWJOYiwTQJzVSpof_dxLAX2CL4OJPvnEPOBCKVFp40z4EYOgnSkEfnyJHg6tLgP4VGEWdvl5mlTefZrBwOoxlRCwSuvNN0fWV2ctYIg9CDpNqL9kyc6LfS68lSLvjTmYqvXX21MuFByXuvLXl0uwZQR11oREzK1NuCaA1Y0zCt2EcfqF8Ng6KEfoCQkBGZNd5qUWn7Xuy6lm0G9yN7KOgXVQgqbmaE4lDVt2SV6zqUZcWFpIvG9p-5e23ivOQyt21IMrioujp_OjVRKxl7iJeaLFdSCU6aJNyOl8PeBv95YTdkFPQvC-ya54b7hJftByHNHTxGAgAA

Interestingly, this works: https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACpWRy2rEMAxFf0V1F5PAkOyTTGDodv6gKcX1o5g6tomVltTk32vXzAMmFLqUdHQlXQUilRaeNM-BGDoK0pCjc2RPcHEp8J9Co4ixt_PEUqbzbFIO-8EMqAUCV95purwyOzprhEE4gKTai_ZMnOi30svJUi7405mK1a6-SpnwqCQ83ImtSaR7mxGtAWsaphX7OATqF8OgKOHQQ0jIgMwab7WotH0vNieWbQY3i3Hpgn5RhaBiZkIodlV9S1bZiV1ZVlxIOmts_zl3yyic5uzTuvapDS5dXZ2PjuaERkQ7sxPby9eJqpWMTHzVaLmSSnDSJPl1f_nsbfOfL3Z9RkH_ssCuW7n-fsLL-gOK5_fWRwIAAA== - works, so it has something to do with the order that stuff is in the template it looks like.

Logs

Uncaught TypeError: LazilyLoadedComponent is not a function

  in App.svelte
    App playground:output:2662
    consequent_effect playground:output:2556
    update_reaction playground:output:1229
    update_effect playground:output:1401
    create_effect playground:output:407
    branch playground:output:539
    if_block playground:output:2556
    update_reaction playground:output:1229
    update_effect playground:output:1401
    process_effects playground:output:1562
    flush_queued_root_effects playground:output:1450
    process_deferred playground:output:1498
    App playground:output:2662
    consequent_effect playground:output:2556
    update_reaction playground:output:1229
    update_effect playground:output:1401
    create_effect playground:output:407
    branch playground:output:539
    if_block playground:output:2556
    update_reaction playground:output:1229
    update_effect playground:output:1401
    process_effects playground:output:1562
    flush_queued_root_effects playground:output:1450
    process_deferred playground:output:1498

System Info

REPL

Severity

annoyance

[dummdidumm]

Will be fixed by #12646, if we go that route (else we need to extract that fix out)

[Conduitry]

Ah, cool, yup, can confirm that this works: https://svelte-5-preview-okqvr9dmb-svelte.vercel.app/#H4sIAAAAAAAACpWRW0vEMBCF_8oQH7aFpX3vDcTX_QdWJOYiwTQJzVSpof_dxLAX2CL4OJPvnEPOBCKVFp40z4EYOgnSkEfnyJHg6tLgP4VGEWdvl5mlTefZrBwOoxlRCwSuvNN0fWV2ctYIg9CDpNqL9kyc6LfS68lSLvjTmYqvXX21MuFByXuvLXl0uwZQR11oREzK1NuCaA1Y0zCt2EcfqF8Ng6KEfoCQkBGZNd5qUWn7Xuy6lm0G9yN7KOgXVQgqbmaE4lDVt2SV6zqUZcWFpIvG9p-5e23ivOQyt21IMrioujp_OjVRKxl7iJeaLFdSCU6aJNyOl8PeBv95YTdkFPQvC-ya54b7hJftByHNHTxGAgAA

[Conduitry]

This has been fixed in next 203.