The Compass BSON transpiler plugin allows developers to work in their chosen programming language when using MongoDB Compass, enabling flexibility and ease of use. The plugin leverages the open-source parsing tool ANTLR to minimize complexity and supports multiple input languages (MongoDB Shell, JavaScript, and Python) and output languages (Java, C#, Python, MongoDB Shell, and JavaScript). The transpiler is built as a standalone Node.js module and can be used in any browser-based or Node.js application. It uses a modular design, allowing users to contribute new input and output languages without requiring knowledge of existing languages. The plugin's latest version includes additional features such as support for a wider range of syntax through the use of a symbol table, function calls with arguments, type validation, and informative error messages.