> [!IMPORTANT]
> This page was copied from https://github.com/dart-lang/sdk/wiki and needs review.
> Please [contribute](../CONTRIBUTING.md) changes to bring it up-to-date -
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---

# Developer notes for working on kernel

## How to test changes on pkg/kernel:

Run dartanalyzer in strong mode:
```
(cd pkg/kernel && dartanalyzer --strong bin lib test)
```

Run unit tests of kernel, front_end, and dart2js that are directly affected:
```
./tools/test.py pkg/kernel -mrelease --checked
./tools/test.py pkg/front_end -mrelease --checked
./tools/test.py dart2js/kernel -mrelease --checked
```

Run end-to-end tests using dartk + VM:
```
./tools/test.py -m release -c dartk language
```

Optionally (this is slow) run end-to-end tests using AOT:
```
./tools/build.py dart_precompiled_runtime
./tools/test.py -cdartkp -rdart_precompiled language co19
```

Comparing the output of compiling dart2js before and after the change. This [script][1] can make it easier to compare the results.

[1]: https://gist.github.com/asgerf/adde37ed58fe984d53b82d362187c777