svelte cli: error when converting typescript with angle-brackets casting

[werner-drklein]

Describe the bug

sv migrate svelte-5

fails with an error like

Error while migrating Svelte code [InternalCompileError: Unexpected token `}`. Did you mean `}` or `{"}"}`?] {

when typescript code contains casting using angle-brackets. (<>)

Reproduction

in typescript code use angle-brackets casting:

const variable = <string>somevar;

If you instead cast using the as keyword, it works as expected:

const variable = somevar as string;

Logs

No response

System Info

sv 0.6.6


  System:
    OS: macOS 14.7.1
    CPU: (14) arm64 Apple M3 Max
    Memory: 104.59 MB / 36.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.9.0 - /usr/local/bin/node
    Yarn: 1.22.22 - /opt/homebrew/bin/yarn
    npm: 10.9.2 - /opt/homebrew/bin/npm
    pnpm: 9.12.2 - ~/Library/pnpm/pnpm
  Browsers:
    Chrome: 131.0.6778.108
    Edge: 131.0.2903.70
    Safari: 18.1.1

Severity

annoyance

[paoloricciuti]

This is a known issue with acorn typescript...thanks for reporting tho!

closing as duplicate of #13179