KMP-IMPACT

Analyzing a bump locally

Run the pipeline against any Kotlin Multiplatform repository on your machine. Useful for triaging a real Dependabot PR before the CI workflow finishes, or for experimenting with a bump that has not been raised yet.

Prerequisites

KMP-IMPACT installed in editable mode (see Installation).
A KMP project that keeps its versions in gradle/libs.versions.toml.
For the dynamic phase: JDK 21, the Android SDK, and a running emulator.

Static-only analysis

The fastest mode. Skips Phase 3 entirely.

kmp-impact analyze \
  --repo /path/to/your/kmp/project \
  --dependency io.ktor \
  --before-version 2.3.8 \
  --after-version 2.3.11 \
  --output-dir output \
  --skip-dynamic

--dependency accepts a Maven group prefix (io.ktor) or a full coordinate substring (io.ktor:ktor-client-core). The analyzer resolves it to one or more Kotlin package roots through the internal mapping table.

Full analysis with the dynamic phase

Drop --skip-dynamic. The pipeline will:

Build ./gradlew :<android-module>:assembleDebug on the BEFORE state.
Build the same target on the AFTER state.
Launch DroidBot against each APK and diff the resulting UTGs.

kmp-impact analyze \
  --repo /path/to/your/kmp/project \
  --dependency io.ktor \
  --before-version 2.3.8 \
  --after-version 2.3.11 \
  --output-dir output-full

If either APK fails to compile, the pipeline emits a BLOCKED Phase 3 with the Gradle log attached. The static phase still completes.

Opening the report

open output/report/index.html         # macOS
xdg-open output/report/index.html     # Linux
start  output/report/index.html       # Windows

The six tabs are documented in Guides → Reading the Report.

Re-running a single phase

Each phase reads the previous phase’s JSON from disk, so you can re-run a single phase by pointing the CLI at an existing output/ directory. This is useful when iterating on phase4_consolidate or phase5_visualize without re-running the expensive static scan.

kmp-impact analyze \
  --repo /path/to/project \
  --dependency io.ktor \
  --before-version 2.3.8 \
  --after-version 2.3.11 \
  --output-dir output \
  --skip-dynamic \
  --keep-shadows

--keep-shadows retains phase1/before/ and phase1/after/, which lets you re-execute Phase 2 against the same shadow copies.