KMP-IMPACT

Quickstart

End-to-end run on a Kotlin Multiplatform project in under five minutes. We will analyse a Ktor 2.3.8 → 2.3.11 bump on a sample project and open the HTML report.

1. Pick a project

Any KMP project that:

• keeps its versions in gradle/libs.versions.toml,
• has at least one Kotlin source file that imports the dependency you want to bump,
• builds with the Gradle wrapper.

For this walkthrough we’ll use the demo Pokedex KMP app:

git clone https://github.com/EstebanCastel/KMP-IMPACT-Pokedex-with-tool.git ~/pokedex-kmp

2. Run a static analysis

kmp-impact analyze \
  --repo ~/pokedex-kmp \
  --dependency io.ktor \
  --before-version 2.3.8 \
  --after-version 2.3.11 \
  --output-dir output \
  --skip-dynamic

The first run is the slowest because Gradle resolves dependencies for both BEFORE and AFTER shadow copies. Subsequent runs reuse the Gradle cache.

3. Open the report

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

You will see six tabs:

Tab	What it shows
Summary	Bump, impact counts, risk level, recommendation.
Static impact	List of .kt files marked direct (level 2) or transitive (level 1).
UI impact	DroidBot UTG diff. Empty when --skip-dynamic.
Traceability	File → Screen mapping with sticky header.
Visualization	Propagation tree (BFS, interactive) and CodeCharta JSON download.
Raw artifacts	Links to phase2/impact_graph.json, phase4/consolidated.json, etc.

4. (Optional) Add the dynamic phase

Re-run without --skip-dynamic, with the Android SDK and an emulator available:

kmp-impact analyze \
  --repo ~/pokedex-kmp \
  --dependency io.ktor \
  --before-version 2.3.8 \
  --after-version 2.3.11 \
  --output-dir output-full

The pipeline will:

1. Build :android:assembleDebug on the BEFORE state.
2. Build the same target on the AFTER state.
3. Launch DroidBot against each APK and diff the resulting UTGs.

If either APK fails to build, the report will mark the dynamic phase BLOCKED with the compilation log attached. The static report is still produced.

5. Where to go next

• Adapt your own KMP repo with the Preparing an existing KMP project checklist before wiring it up.
• Plug it into a real PR flow with the GitHub Action guide.
• Read the Pipeline overview to understand what each phase contributes.
• Browse the Presets for ready-to-fork examples per KMP project.

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