repl-sdk

repl-sdk is a runtime compiler library for building fast, extensible REPLs and interactive playgrounds in the browser. Current stable version is 1.6.0, released in April 2026 as part of the ember-repl monorepo. It uses es-module-shims and supports JavaScript, React, Vue, Svelte, Ember, Glimdown, and Mermaid out of the box. Key differentiators: on-demand async compilation (only pay for what you compile for), nested language support within Markdown, and a flexible plugin API for adding custom compilers/renderers. Unlike alternatives like CodeSandbox or RunKit, repl-sdk is designed for embedding in web apps with minimal overhead and full control over the compilation pipeline.