Plugin Official

TypeScript LSP

TypeScript/JavaScript language server for Claude Code: code intelligence and diagnostics for .ts files.

Author: Anthropic
Works with: Claude Code
License: Apache-2.0
Documented: Oct 2, 2026

What TypeScript LSP is

typescript-lsp connects the TypeScript/JavaScript language server to Claude Code, giving it code intelligence and diagnostics for ts, .tsx, .js, .jsx, .mts, .cts, .mjs, .cjs files. The plugin only wires up the server; the server binary must be installed separately.

What it does

Where TypeScript LSP runs and what it adds, from its documentation

Registers the typescript-language-server language server (command: typescript-language-server --stdio) via the marketplace lspServers entry
Maps file extensions to the language: .ts, ..tsx, ..js, ..jsx, ..mts, ..cts, ..mjs, ..cjs
Gives Claude Code code intelligence and diagnostics for TypeScript/JavaScript projects

When to use it

Good fit

Working in a TypeScript/JavaScript codebase where Claude Code should use real language-server analysis
Wanting diagnostics and navigation from typescript-language-server without leaving Claude Code

Not for

Projects in other languages (it only maps the extensions listed)
Setups where you cannot install the typescript-language-server binary on PATH

How to install TypeScript LSP

You need: Claude Code; typescript-language-server binary on PATH; Node.js / npm (or yarn)

Install the language server binary first (the plugin does not bundle it):
npm install -g typescript-language-server typescript
Or: yarn global add typescript-language-server typescript
Install the plugin: /plugin install typescript-lsp@claude-plugins-official

Permissions and security

What it can access

Launches the typescript-language-server process locally and reads the project files it analyzes

Security notes from the maintainers

Marketplace README: make sure you trust a plugin before installing, updating, or using it

Review the source before granting an agent access to credentials or production systems. We document what the maintainers state; we do not audit code.

Limitations

Requires the language server to be installed separately; the plugin does not install it

Tools it extends

Coding

Claude Code

Web · Desktop

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Anthropic's agentic coding tool that reads your codebase, edits files and runs commands from the terminal, IDEs, desktop app or browser.

Watch out: Not included in the Free Claude plan, and usage on subscriptions is capped by plan limits.

Listed Not yet reviewed

Verified Sep 29, 2026 code.claude.com (opens Claude Code website in a new tab)

From $20/mo US · checked Sep 29

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Frequently asked questions

How do I install the typescript-lsp plugin for Claude Code?

Install the language server first, then run /plugin install typescript-lsp@claude-plugins-official. source

Which file extensions does the typescript-lsp plugin support?

.ts, ..tsx, ..js, ..jsx, ..mts, ..cts, ..mjs, ..cjs. source

Does the typescript-lsp plugin install typescript-language-server for me?

No. The README lists install commands for the server itself; the plugin only registers it with Claude Code. source

Related guides

Claude Code plugins and marketplace: 40 profiled in 2026

Sources and gaps

https://raw.githubusercontent.com/anthropics/claude-plugins-official/main/plugins/typescript-lsp/README.md readme, checked Oct 2, 2026
https://raw.githubusercontent.com/anthropics/claude-plugins-official/main/.claude-plugin/marketplace.json registry, checked Oct 2, 2026
https://raw.githubusercontent.com/anthropics/claude-plugins-official/main/README.md readme, checked Oct 2, 2026
https://github.com/typescript-language-server/typescript-language-server docs, checked Oct 2, 2026

Not stated by the maintainers: last_release not visible.