Bad error message when target is not exported

[deciduously]

Reproduction:

export default tg.target(() => notExported());
const notExported = tg.target(() => 5);

Result:

info target tgt_01wccy0aj43eckt8z4wnr2qtzsf335d97jz1m66r6q8bhxdc7j8x80
info build bld_00069s46bbd5xf34k4zhan5300wr
<unknown>
error failed to run the command
-> Uncaught TypeError: Cannot convert undefined or null to object
-> the build failed
error: script "tgr" exited with code 1