three.js/src/cameras/Camera.d.ts

import { Matrix4 } from './../math/Matrix4';
import { Vector3 } from './../math/Vector3';
import { Object3D } from './../core/Object3D';

// Cameras ////////////////////////////////////////////////////////////////////////////////////////

/**
 * Abstract base class for cameras. This class should always be inherited when you build a new camera.
 */
export class Camera extends Object3D {
  /**
   * This constructor sets following properties to the correct type: matrixWorldInverse, projectionMatrix and projectionMatrixInverse.
   */
  constructor();

  /**
   * This is the inverse of matrixWorld. MatrixWorld contains the Matrix which has the world transform of the Camera.
   */
  matrixWorldInverse: Matrix4;

  /**
   * This is the matrix which contains the projection.
   */
  projectionMatrix: Matrix4;

  isCamera: true;

  copy(source: Camera, recursive?: boolean): this;

  getWorldDirection(target: Vector3): Vector3;

  updateMatrixWorld(force?: boolean): void;
}