A configuration file is json file with following fields. And you can find example configuration files for 4 JS engines.

• engine: Type of JS engine ("Charka", "JSC", "MOZ", "V8").
• engine_path: ABSPATH to engine
• timeout: Timeout for executing a JS code.
• argv: Additional arguments for executing a JS engine.
• env: Additional environment variables for executing a JS engine.
• seed_path: ABSPATH to seed.
• preproc_dir: ABSPATH for saving preprocessing results.
• tmp_dir: ABSPATH for temporarily saving generated JS code.
• bug_dir: ABSPATH for saving JS code which triggered some crash.
• filters: List of symbols to exclude from the code brick pool.
• jobs: The number of jobs (cores) to use for fuzzing.