Svelte 5 migrate function throws if there's no semicolon at the end of a reactive statement

[tomtiao]

Describe the bug

The migrate function throws an error with the message Error: Cannot overwrite a zero-length range – use appendLeft or prependRight instead. It works fine if there's a semicolon at the end though.

Stack when throws:

Error: Cannot overwrite a zero-length range – use appendLeft or prependRight instead
    at NA.update (compiler/index.js@5.0.0-next.136:1:633353)
    at LabeledStatement (compiler/index.js@5.0.0-next.136:1:678165)
    at next (compiler/index.js@5.0.0-next.136:1:900)
    at _ (compiler/index.js@5.0.0-next.136:1:675892)
    at e (compiler/index.js@5.0.0-next.136:1:871)
    at eval (compiler/index.js@5.0.0-next.136:1:591)
    at Array.forEach (<anonymous>)
    at next (compiler/index.js@5.0.0-next.136:1:540)
    at i (compiler/index.js@5.0.0-next.136:1:309)
    at next (compiler/index.js@5.0.0-next.136:1:900)

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAACk2OzWrDMAzHX0WIHtY10K5HzwmUPUa9w-ooYObIJpYHw_jdh5PS9aif_l8FJ-cpoboW5K-ZUOElRuxQfmM70g95IewwhbzYRnSyi4syGDbiScCGzAI9nAw3NGW24gKDY7vQTCwveyjtY2STHnp4e2-gbo6dgjHkm6fx4x616V7hbFgf_-tY37JIYAisrHf2uy-PkrruWWlSUNaE2uybZTCs4_DIVVCeK6s-xgE7nMPoJkcjKlky1c_6B3LUWlgeAQAA

Logs

index-ZdIW0gts.js:80 Console was cleared
index-ZdIW0gts.js:80 running Svelte compiler version 5.0.0-next.136
index.js@5.0.0-next.136:1  Error while migrating Svelte code
e.migrate @ index.js@5.0.0-next.136:1
d @ index-ijMT1Sp-.js:5
(anonymous) @ index-ijMT1Sp-.js:2

System Info

REPL

Severity

annoyance