Viz.js now has first-class support for Web Workers, and returns Promises for all rendering functions, rather than accepting callbacks for some of its utility functions. However, you don't have to use Web Workers: Viz.js still works with just script tags.
API and rendering code have been split into separate files to make it easier to work with Viz.js in bundlers.
New output types: JSON objects and SVG elements. For example, the renderSVGElement function returns the promise of an SVGSVGElement object, ready to insert into the document.
The single Viz() function is now a class and reuses its Emscripten module instance, improving performance across multiple calls.
The API code is now built with Rollup, and the release includes an ES6 module.
Added yInvert option. (Equivalent to the -y command-line option.)
TypeScript declarations have been removed in this release.
Accept a Worker instance for the worker option instead of a string. Add workerURL option for passing the URL of a worker as a string. Less specific detection of worker scope.