provides helpers for building ProseMirror documents for tests

 This module provides helpers for building ProseMirror documents for tests. It's
 main file exports a basic schema with list support, and a number of functions,
 whose name mostly follows the corresponding HTML tag, to create nodes and marks
 in this schema. The prosemirror-test-builder/dist/build module exports a
 function that you can use to create such helpers for your own schema.
 .
 Node.js is an event-based server-side JavaScript engine.