AI BriefingAce, CodeMirror, Monaco Compared: Analyzing Browser-Based Code Editors
Key point
Based on a Replit developer's experience, this piece compares the features, strengths, and weaknesses of browser-based code editors such as Ace, Monaco, and CodeMirror.
Details
Replit adopted the Ace editor to support complex programs, moving on from its early simple REPL environment. Ace was a powerful tool with a rich ecosystem and support for various languages, but after Cloud9's acquisition, maintenance stalled and its API became outdated.
This led to a decision to switch to Monaco, the engine behind VSCode. Monaco offers a modern UI and excellent autocomplete functionality, along with an API and extensibility well suited for implementing the LSP (Language Server Protocol).
However, the following technical challenges arose during Monaco's adoption:
- Lack of language modes: With a shortage of language modes that work in the browser environment, the team had to implement and contribute modes for Scala, Julia, and others themselves.
- Build and performance issues: The Webpack configuration is extremely complex, and the pre-compression bundle size reaches about 5MB, making code-splitting and lazy loading difficult.
- Mobile optimization struggles: The intricately tangled codebase made it very difficult to implement behavior for the mobile environment.
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