README.md

lsp

lsp is a library for building language servers, handling:

JSON-RPC transport
Keeping track of the document state in memory with the Virtual File System (VFS)
Responding to notifications and requests via handlers
Setting the server capabilities in the initialize request based on registered handlers
Dynamic registration of capabilities
Cancellable requests and progress notifications
Publishing and flushing of diagnostics

It is part of the lsp family of packages, along with lsp-test and lsp-types