The first exit() call now captures its value/error and initiates teardown
synchronously; subsequent exit() calls are complete no-ops, so waitUntilExit
resolves/rejects with the FIRST value rather than the last. This mirrors
Ink's handleAppExit guard (isUnmounted || isUnmounting → early return).
Previously each exit() queued a microtask that overwrote pendingExitResult/
pendingExitError before resolveExit ran, making it last-wins. An exitInitiated
flag set at the top of exit() now guards the value capture and re-resolve,
while the deferred microtask teardown (needed because exit() is called from
inside the Vue update cycle) is preserved.
Reverses the sweep-1 refutation: exit() was NOT already first-wins guarded.
Also guard unmount-in-progress (isUnmounting parity) + value→error test.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Yunfei He
f78121f6e7