This folder contains the capnp configuration, JavaScript mocks for certain APIs which communicates with a Fuzzilli.

The base configuration can be found in worker.js and config.capnp. The folder contains a config-full.capnp`` and worker-full.jsfile which imports the to-date fuzzed APIs. To test a certain API import it in the used.js` file.

The main execution looks as follows:

• Fuzzilli starts workerd.
• Workerd will read in the capnp configuration, pointing to a script that imports the custom API endpoints, e.g. (workerd config, worker.js).
• Workerd will import the dependencies and call Stdin.reprl
• Workerd then opens the pipes and a shared memory sending a HELO to Fuzzilli, which responds with a HELO back.
• Fuzzilli sends the exec command, the length of the script to execute and the script itself.
• Workerd will then compile and execute the script similar to the eval command in a separate scope

bazel test --config=fuzzilli //src/workerd/tests:test-reprl-kj --action_env=CC=/usr/bin/clang-19 --test_timeout=5 --test_output=all

From the Fuzzilli directory test if the REPRL interface works by running:

# in Fuzzilli folder
swift run REPRLRun <path-to-workerd> fuzzilli <path-to-capnp-config> --experimental

swift run -c release FuzzilliCli --inspect=all --profile=workerd <path-to-workerd-root>/bazel-bin/src/workerd/server/workerd --additionalArguments=<path-to-workerd-root>/samples/reprl/config-full.capnp,--experimental --storagePath=fs-new --jobs=30 --importCorpus=<path-to-corpus> --corpusImportMode=full --staticCorpus