feat: add ephemeral attribute support

empiricaly / empirica

Open source project to tackle the problem of long development cycles required to produce software to conduct multi-participant and real-time human experiments online.

Apache License 2.0

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Add ephemeral attribute support.

This allows you to define attributes that are not persisted to the database, but are available to the client and server while the server is still running. These attributes will sync with all players as normal attributes. This is useful for data that that would be unreasonable to persist to the database due to size or volatility, but is still useful to share between clients and the server.

For example, you could use this to sync the mouse movements of the players.

player.set("mouse", { x: 123, y: 456 }, { ephemeral: true });
player.get("mouse"); // { x: 123, y: 456 }

empiricaly / empirica

feat: add ephemeral attribute support #533

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