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DOCSENGINEGAMEPLAY AND SCRIPTINGGAMEPLAY PROGRAMMINGJAVASCRIPT LIFECYCLE AND API 1.0

JavaScript lifecycle and API 1.0

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JavaScript assigns the same lifecycle to globalThis.behavior:

javascript
globalThis.behavior = {
  Start() { rustic.log("info", "started"); },
  FixedUpdate(dt) {
    const [x, y, z] = rustic.get_translation();
    rustic.set_translation(x + dt, y, z);
  },
  Update(dt) {},
  OnDestroy() {},
};

Lua and JavaScript behaviors can be attached to the same entity. They share engine state rather than VM values. The JavaScript bridge exposes time, entity identity, translation, typed public properties, action-state snapshots, logging, and enabled state. Generated declarations live at .rustic/generated/programming/rustic_api.d.ts.