Add host function registration for Node.js#31
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simongdavies merged 1 commit intomainfrom Mar 3, 2026
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Add support for registering host-side JavaScript callbacks that guest sandboxed code can call via ES module imports. New APIs: - proto.hostModule(name) - Create a builder for registering functions - builder.register(name, callback) - Register a host function - proto.register(module, fn, callback) - Convenience method Guest code imports host modules as 'import * as math from "host:math"' and calls functions like math.add(1, 2). Arguments are JSON-serialized across the sandbox boundary. Both sync and async callbacks are supported. Changes: - hyperlight-js: Add register_raw() for dynamic NAPI scenarios - js-host-api: Add HostModule wrapper, ThreadsafeFunction bridge - js-host-api: Update Cargo.toml to use tokio_rt feature - Add comprehensive tests (22 new JS tests, 4 new Rust tests) - Add host-functions.js example - Update README with Host Functions documentation Signed-off-by: Simon Davies <simongdavies@users.noreply.github.com>
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Add support for registering host-side JavaScript callbacks that guest sandboxed code can call via ES module imports.
New APIs:
Guest code imports host modules as 'import * as math from "host:math"' and calls functions like math.add(1, 2). Arguments are JSON-serialized across the sandbox boundary. Both sync and async callbacks are supported.
Changes: