ma-ecs

ma-ecs is

• tiny: adds ~3kb (minified) to your bundle when fully utilized
• precise: schedule systems and groups of systems
• familiar: use any value as data
• replicable: replicate entities and events with a built-in, extensible arraybuffer protocol

Installation

npm i ma-ecs

Other stuff

Complex type rules used for both querying and network replication

let Player = create_type(
  // Match entities that...
  any_of(
    // have a changed position, velocity, or rotation
    has_changed(Position),
    has_changed(Velocity),
    has_changed(Rotation),
  ),
  // have a team
  one_of(TeamA, TeamB),
  // and are alive
  not(Dead),
)

let write_stream_reliable = use_const(Stream.create_write_stream)
let write_stream_unreliable = use_const(Stream.create_write_stream)
let query = use_query(Player)
let encode = use_encode(Player)

query((p, v, r, t) => {})

// bifurcate the stream into reliable (ops) and unreliable (updates) streams
encode(write_stream_reliable, write_stream_unreliable)

// or, just write everything reliably
encode(write_stream_reliable)

// filter per-entity
encode(write_stream_reliable, (entity, world) => /* */)

Extending the network protocol

App.add_plugin(app, app => {
  let protocol = app.get_resource(Protocol)
  Protocol.extend(protocol, MY_MESSAGE_ID, read_stream => {
    // decode message
  })
})

Constraints

An entity cannot have more than 255 components included in the same update.