An NPM multi-package project that holds an interactive coding environment for JavaScript (and Typescript), resembling Jupyter Notebook. Written in Typescript, using React.js and Redux on the client-side, and Node.js and express on the server-side. Code transpiling+bundling is performed directly in the browser using ESBuild, via Web Assembly , and all changes are saved to a local file. Package management and deployment are handled with Lerna CLI.