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Calva uses a mix of static and dynamic analysis to power the experience. A lot of the static abilities come from clojure-lsp. This enables you to check something up in a project, with a lot of navigational and contextual support, without starting a REPL for it. (And once you do start a REPL you'll get even more capabilities, enabled by the dynamic analysis.)

Starting the LSP server

You don't need to do anything to start clojure-lsp. No install, no commands, no nothing. It does take a while for clojure-lsp to start, though, especially the first time for a new project, when clojure-lsp (via clj-kondo) indexes the project files.

Calva will show a progress notification while the server is starting, which will go away once the LSP is ready to serve. However: Most of Calva's functionality is available regardless of the LSP server, so please start using Calva while this server is starting.

Ignoring LSP cache files

clojure-lsp stores its project analysis information in your project. Git users can add these lines to their project root directory .gitignore:


See also: