Example Camera

types/entity.d.ts

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+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+// ---------------------------------------------------------------------------
+// Component (generic base returned by entity.add() for untyped components)
+// ---------------------------------------------------------------------------
+
+/** Base component returned by entity.add() for component types without a specific module. */
+interface Component {
+  /** Entity ID this component belongs to. */
+  readonly entity: number;
+  /** Component slot ID. */
+  readonly id: number;
+  toString(): string;
+}
+
+interface ComponentConstructor {
+  /** Sentinel value for an invalid component ID. */
+  readonly INVALID: number;
+
+  // Component type constants (generated from componentlist.h)
+  readonly POSITION: number;
+  readonly CAMERA: number;
+  readonly RENDERABLE: number;
+  readonly PHYSICS: number;
+  readonly TRIGGER: number;
+  readonly OVERWORLD: number;
+  readonly PLAYER: number;
+  readonly INTERACTABLE: number;
+  readonly OVERWORLD_CAMERA: number;
+  readonly OVERWORLD_TRIGGER: number;
+
+  new(): never;
+}
+
+declare var Component: ComponentConstructor;
+
+// ---------------------------------------------------------------------------
+// Position
+// ---------------------------------------------------------------------------
+
+/** Position/rotation/scale transform component with optional parent hierarchy. */
+interface Position extends Component {
+  /**
+   * Local-space position. Assigning a Vec3 writes to the C transform and
+   * marks the world transform dirty. Reading returns a fresh Vec3 copy.
+   */
+  localPosition: Vec3;
+  /** World-space position (accounts for all parent transforms). */
+  worldPosition: Vec3;
+  /** Local-space euler rotation in radians (XYZ). */
+  localRotation: Vec3;
+  /** World-space euler rotation in radians. */
+  worldRotation: Vec3;
+  /** Local-space scale. */
+  localScale: Vec3;
+  /** World-space scale. */
+  worldScale: Vec3;
+  /**
+   * Orients the transform to look at a world-space target point.
+   * Uses the current local position as the eye. Optionally specify an up
+   * vector (defaults to Y-up).
+   */
+  lookAt(target: Vec3, up?: Vec3): void;
+  /**
+   * Sets this component's parent in the transform hierarchy.
+   * Pass `null` or `undefined` to detach.
+   */
+  setParent(parent: Position | null | undefined): void;
+  toString(): string;
+}
+
+interface PositionConstructor {
+  new(): never;
+}
+
+declare var Position: PositionConstructor;
+
+// ---------------------------------------------------------------------------
+// Camera
+// ---------------------------------------------------------------------------
+
+/** Camera projection component. */
+interface Camera extends Component {
+  /** Field of view in radians (perspective projections only). */
+  fov: number;
+  /** Near clip plane distance. */
+  nearClip: number;
+  /** Far clip plane distance. */
+  farClip: number;
+  /** Projection type — one of the Camera.PERSPECTIVE / Camera.ORTHOGRAPHIC constants. */
+  projType: number;
+  toString(): string;
+}
+
+interface CameraConstructor {
+  readonly PERSPECTIVE: number;
+  readonly PERSPECTIVE_FLIPPED: number;
+  readonly ORTHOGRAPHIC: number;
+  new(): never;
+}
+
+declare var Camera: CameraConstructor;
+
+// ---------------------------------------------------------------------------
+// Entity
+// ---------------------------------------------------------------------------
+
+interface Entity {
+  /** Add a component of the given type and return a typed instance. */
+  add(type: CameraConstructor["PERSPECTIVE"] | number): Component;
+  toString(): string;
+}
+
+interface EntityConstructor {
+  /** Sentinel value for an invalid entity ID. */
+  readonly INVALID: number;
+  /** Creates a new entity and returns it. Returns Entity.INVALID slot if the pool is full. */
+  create(): Entity;
+  /** Disposes the entity and all its components. */
+  dispose(entity: Entity): void;
+  new(): never;
+}
+
+declare var Entity: EntityConstructor;