lsp-types 0.12.5

Zero-dependency Python library for Language Server Protocol types

LSP Types

Publish the excellent work of Sublime LSP as a PyPI package.

LSP Types is a Python package that aims to provide a fully typed interface to Language Server Protocol (LSP) interactions. It can be used to simply utilize the types, or to interact with an LSP server over stdio.

It is a goal to maintain zero-dependency status for as long as possible.

Installation

pip install lsp-types

Usage

Using the LSP types:

import lsp_types

# Use the types

Using an LSP process through stdio:

[!TIP] Recommend using basedpyright for extended features.

from lsp_types.process import LSPProcess, ProcessLaunchInfo

process_info = ProcessLaunchInfo(cmd=[
    "pyright-langserver", "--stdio"
])

async with LSPProcess(process_info) as process:
    # Initialize the process
    ...

    # Grab a typed listener
    diagnostics_listener = process.notify.on_publish_diagnostics(timeout=1.0)

    # Send a notification (`await` is optional. It ensures messages have been drained)
    await process.notify.did_open_text_document(...)

    # Wait for diagnostics to come in
    diagnostics = await diagnostics_listener

LSPs

The following LSPs are available out of the box:

• Pyright
• Pyrefly

Pyright Example

async def test_pyright_session():
    code = """\
def greet(name: str) -> str:
    return 123
"""

    pyright_session = await Session.create(PyrightBackend(), initial_code=code)
    diagnostics = await pyright_session.get_diagnostics()

    assert diagnostics != []

    code = """\
def greet(name: str) -> str:
    return f"Hello, {name}"
"""

    assert await pyright_session.update_code(code) == 2

    diagnostics = await pyright_session.get_diagnostics()
    assert diagnostics == []

Development

• Requires Python 3.12+.
• Requires uv for dev dependencies.

Generate latest types in one go:

make generate-latest-types

Download the latest json schema:

make download-schemas

Generate the types:

make generate-schemas

Copy the lsp_types/types.py file to your project.

NOTE: Do not import types that begin with __. These types are internal types and are not meant to be used.

TODOs

• Support server request handlers.