aiecsjs

TypeScript-first archetype ECS with TypedArray SoA components, command buffers, relations, serialization, and SAB-ready snapshot transport.

Status: 0.5.9 - stable 1.0-track core. Root ECS APIs are stable; worker transport remains adapter-shaped and environment-dependent.

Install

pnpm add aiecsjs

import {
  Types,
  addComponent,
  createEntity,
  createWorld,
  defineComponent,
  forEachEntity,
  getComponent,
} from "aiecsjs";

Quick Start

const Position = defineComponent({ x: Types.f32, y: Types.f32 });
const Velocity = defineComponent({ x: Types.f32, y: Types.f32 });

const world = createWorld({ initialCapacity: 1024 });
const e = createEntity(world);
addComponent(world, e, Position, { x: 0, y: 0 });
addComponent(world, e, Velocity, { x: 1, y: 0 });

forEachEntity(world, [Position, Velocity], (entity) => {
  const pos = getComponent(world, entity, Position);
  const vel = getComponent(world, entity, Velocity);
  pos.x += vel.x;
  pos.y += vel.y;
});

Use defineTag() for marker components and defineObjectComponent() when you need object references instead of TypedArray storage.

Public Surface

| Import | Purpose | | --- | --- | | aiecsjs | World/entity/component/query/system helpers, Types, refs, errors, VERSION. | | aiecsjs/loop | createLoop() for fixed-step style loops. | | aiecsjs/commands | createCommandBuffer(), flush(), withCommandBuffer() for deferred structural changes. | | aiecsjs/observers | onAdd, onRemove, onSet, observe. | | aiecsjs/serialize | Binary/JSON world snapshots and delta serializer. | | aiecsjs/worker | Transfer/adopt/attach helpers for worker snapshots. | | aiecsjs/relations | defineRelation, ChildOf, relation add/remove/read helpers. |

Sharp Edges

• Structural mutation during a query loop is allowed by the library, but app systems should prefer withCommandBuffer() when adding/removing/destroying entities from inside iteration.
• Reactive query buffers are unbounded until drained. Poll and clear them every frame or event tick.
• Query registration currently uses a global module cache; many worlds/components can make structural changes scan more query metadata than expected.
• Exclusive relation cleanup is O(incoming) on destroy — a reverse index touches only the edges pointing at the destroyed entity, not the whole relation capacity.
• Serialization restores capacity with safety clamps, but snapshots from untrusted sources should still be treated as hostile input.
• Worker/SAB helpers depend on the runtime environment. Feature-detect SharedArrayBuffer and cross-origin isolation in browsers.
• pnpm lint currently reports many noExplicitAny warnings. They are not release-blocking, but they add AI-review noise.

AI Context

• Short index: llms.txt
• Full generated context: llms-full.txt
• Stability contract: STABILITY.md
• Current review backlog: REVIEW.md
• Machine-readable API: api.json
• Release history: CHANGELOG.md

License

MIT