perspective-viewer 4.4.0

A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
Documentation 
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// ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
// ┃ This file is part of the Perspective library, distributed under the terms ┃
// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

//! Engine-handle types for the four major state singletons.
//!
//! These are the async-machinery halves of the engine/value split described in
//! the props modules.  They own JS object handles, draw locks, async
//! subscriptions, and PubSub channels — i.e. anything that cannot be cheaply
//! cloned into a plain `PartialEq` prop.
//!
//! **Current status (Step 3 of the migration):** Each `*Engine` type is a thin
//! type alias for the existing `Rc<*Handle>` wrapper.  They will be replaced
//! with true struct types in later migration steps once the component tree has
//! been updated to consume value-semantic props instead of the old handles.

pub use crate::dragdrop::DragDrop as DragDropEngine;
pub use crate::presentation::Presentation as PresentationEngine;
pub use crate::renderer::Renderer as RendererEngine;
pub use crate::session::Session as SessionEngine;