There is no UUID in the Kotlin standard library, and the fixes differ per platform
Random is seeded differently per target and is not secure anywhere. An id generator is a security decision.
kmp
41 posts
@Preview is Android-only, and your shared UI has no preview at all
The annotation lives in an Android artifact, so commonMain cannot use it — and that shapes how you write composables.
The desktop target is the cheapest bug oracle you are not using
It builds in seconds, runs real Compose, and needs no device.
A version catalog is a contract, and a transitive bump breaks it quietly
Declared versions are requests, not guarantees. Resolution picks the highest.
A shared ViewModel has no lifecycle, so you have to give it one
androidx.lifecycle.ViewModel is Android's. The shared class needs an explicit clear() and two platforms that call it.
A Flow is cold, and that is why your ViewModel fires three network calls
Each collector re-runs the producer. Two UI observers plus a test is three executions.
There is no Logcat in commonMain, and println is not a logger
Five targets, five sinks, and one of them discards your output silently.
runTest skips your delays, which is why the flaky test passed
Virtual time makes a 30-second timeout instant — and makes a real-dispatcher leak invisible.
Source sets are a graph, and iosMain is not where you think it is
The default hierarchy creates intermediate source sets you never declared.
StateFlow drops what you needed and keeps what you didn't
Conflation turns two identical emissions into one, so a repeated event vanishes.
One failed child cancelled the whole screen, and the scope was the reason
Structured concurrency propagates failure upward by design. SupervisorJob is how you declare independence.
commonTest runs on every target, which is the point and the cost
One test, five executions. That is how you find platform bugs — and how one flaky test fails five jobs.