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@obergodmar/coc-svelte-language-tools

obergodmar

Svelte and SvelteKit language support for coc.nvim, maintained with upstream language-tools

Installation CommandVim prompt
:CocInstall @obergodmar/coc-svelte-language-tools
GitHub owner
obergodmar
Version
v0.2.13
Requirements
coc ^0.0.82
License
MIT
Repository
GitHub
npm latest published 2026-10-15Node >=24.12.0Registry summary

Published Package Summary

Svelte language tools for coc.nvim

An independent CoC client maintained in a fork of sveltejs/language-tools. The language server, TypeScript plugin and svelte2tsx are built from the same checkout.

Status

Version 0.2.0. Tested on Linux with Node 24, Neovim 0.12.5, Vim 9.2, a pinned coc.nvim master revision, coc-tsserver 2.4.1, TypeScript 6.0.3, Svelte 4.2.20 / 5.57.1 and SvelteKit 2.70.3. Other coc.nvim revisions and operating systems have not yet been integration-tested.

Available through the Svelte language server:

  • Completion, hover, diagnostics, definitions, references and symbol rename.
  • Formatting, code actions, document/workspace symbols and folding.
  • Semantic tokens, inlay hints, linked editing and call hierarchy, subject to the corresponding CoC settings and server capabilities.
  • HTML, CSS and TypeScript features inside Svelte components, including Svelte 5 runes.

The client adds:

  • A managed service in :CocList services, restart and output logging.
  • Live TS/JS buffer synchronization, including replay after restart and discard on close.
  • TypeScript plugin discovery and configuration through coc-tsserver, including unsaved Svelte props, replay after tsserver restart and discard on buffer close.
  • Import updates for moves performed through CoC's file operations.
  • Reference CodeLens adaptation, compiled JS/CSS previews, extraction and migration commands.
  • Restart after saving Svelte, Vite, TypeScript or Prettier configuration.
  • Automatic tag closing and native Svelte block snippets.
  • SvelteKit route file generation for TypeScript and JavaScript.

Development

Install Nix, devenv 2.1.2 or newer, and direnv with its shell hook. From the fork root:

direnv allow
coc-setup
coc-build
coc-test
coc-test-setup
coc-test-integration
coc-test-vim

Without direnv, prefix each command with devenv shell --. Node, pnpm, Neovim and Vim come from Nix. pnpm is pinned to the upstream packageManager version through a fixed-output Nix derivation; Corepack is not required. JavaScript dependencies use the committed pnpm lockfile. This is a Nix development environment, not an offline Nix derivation of the entire JavaScript dependency graph.

coc-test-setup downloads a checksum-verified coc.nvim snapshot and installs its locked dependencies plus the locked test versions of coc-tsserver and SvelteKit. Integration tests use isolated editor configuration and data directories under .coc-test/; they do not change your Neovim configuration.

Install from npm

:CocInstall @obergodmar/coc-svelte-language-tools

For automatic installation, add '@obergodmar/coc-svelte-language-tools' to g:coc_global_extensions. Keep coc-tsserver for TS/JS integration. Remove session-local registration of the development extension and disable coc-svelte to avoid duplicate providers. Updates use :CocUpdate.

Every successful push to the fork's coc branch publishes an automatically numbered version to npm after the full test suite and offline archive tests pass. These rolling releases use the latest tag. The archive includes the source commit (gitHead) and npm provenance.

Load the development extension

Build first. Disable/uninstall coc-svelte and remove any manually configured Svelte language server to avoid duplicate providers. Install coc-tsserver for Svelte component support in TS/JS buffers.

In Neovim, load the built package using its absolute directory:

:call CocAction('registerExtensions', '/absolute/path/coc-svelte-language-tools/packages/coc-svelte-language-tools')

This registers the extension for the current session. Launch the editor from the development shell so that CoC uses the Nix Node runtime, or set g:coc_node_path to a suitable Node executable. The extension requires Node >=24.12.0. Ensure .svelte buffers have filetype=svelte; do not associate them with HTML. Syntax highlighting and indentation remain the editor's responsibility.

Editing helpers

svelte.autoClosingTags defaults to true. Tag closing uses upstream's html/tag request, respects void elements, and discards replies after further edits, cursor movement or leaving insert mode. Disable it if another plugin already closes tags.

Type s- at the beginning of a line to complete s-if, s-each, s-await, s-key, s-snippet, s-render, s-script or s-style. CoC handles snippet placeholders; coc-snippets is not required. Disable completion with svelte.snippets.enable: false. :CocCommand svelte.insertSnippet also opens a picker and supports inserting a selected block at the cursor.

:CocCommand svelte.createRouteFile asks for an absolute route directory, file kind and TS/JS language. It supports page, layout, their universal/server load files, endpoints and error pages. Existing files are never overwritten. Custom route directories, route groups and dynamic parameter directories are supported. Templates target Svelte 5 and SvelteKit >=2.16; run your project's svelte-kit sync to generate $types. The generator does not install SvelteKit.

Build and verify an installable archive

coc-build
coc-pack
pnpm --filter @obergodmar/coc-svelte-language-tools test:package
COC_TEST_EDITOR=vim pnpm --filter @obergodmar/coc-svelte-language-tools test:package

The archive is written to artifacts/obergodmar-coc-svelte-language-tools-0.2.0.tgz. It bundles runtime dependencies, including the server patches from this checkout. The package test installs it offline using an empty npm cache, then runs the same headless editor tests against the installed extension.

Publish only the verified archive. A direct publish from the workspace package is blocked because it could substitute unpatched npm releases for workspace dependencies. No npm release has been published yet.

Current boundaries

  • Unsaved Svelte buffers are forwarded to the bundled TypeScript plugin. A separately installed, unpatched upstream plugin does not implement this extension protocol.
  • External filesystem moves do not carry a reliable rename event; import updates require a move performed through CoC. Complex simultaneous folder moves need more coverage.
  • Previews open in a separate read-only scratch window named [Svelte compiled]. JS/CSS filetypes are set explicitly; no virtual URI or file on disk is needed. Close the window with :close. Previews are snapshots; run the command again after editing.
  • SvelteKit $types and $lib, multiple workspace roots, Svelte 4/5 and Vim are integration-tested. SvelteKit 3, macOS and Windows remain outside the tested matrix.
  • Tailwind and ESLint require their own providers. Avoid multiple formatting providers or HTML auto-close plugins acting on the same Svelte buffer.

The automated integration suite currently exercises completion, runes, diagnostics, cross-file definitions, semantic tokens, formatting, unsaved TS/Svelte changes, server restarts, plugin toggling, coc-tsserver component resolution, import updates, compiled preview, tag closing, snippets, route generation and overwrite protection. It also runs SvelteKit sync and verifies generated props, $lib definitions and Svelte 4/5 isolation in three workspace roots, in both Vim and Neovim.

Run :CocCommand svelte.showEnvironment from the affected project buffer to open a copyable report in Svelte Environment. It distinguishes project package resolution, bundled server dependencies, configured paths and the last launched process. It also works with svelte.enable: false and does not start servers or execute project configuration. Project resolution is an on-disk check, not a claim about modules already loaded by a custom server.

Read the complete README
  • Svelte and SvelteKit language support for coc.nvim, maintained with upstream language-tools
Activation Events
  • onLanguage:svelte
  • onLanguage:javascript
  • onLanguage:javascriptreact
  • onLanguage:typescript
  • onLanguage:typescriptreact
  • onCommand:svelte.showEnvironment
  • onCommand:svelte.restartLanguageServer
  • onCommand:svelte.typescript.findFileReferences
  • onCommand:svelte.typescript.findComponentReferences
  • onCommand:svelte.showCompiledCode
  • onCommand:svelte.showCompiledCSS
  • onCommand:svelte.extractComponent
  • onCommand:svelte.migrate_to_svelte_5
  • onCommand:svelte.insertSnippet
  • onCommand:svelte.createRouteFile
Developer Resources

Want to build, test, or contribute to coc.nvim extensions? Explore our official SDK and testing toolkits.

Open Developer Guide

Version History

Published with @obergodmar/coc-svelte-language-tools@0.2.13 as node_modules/svelte-language-server/CHANGELOG.md.

Open source file

Changelog

0.18.4

Patch Changes

  • fix: don't log an error for vite configs without a Svelte plugin (#3091)

  • fix: handle SvelteKit 3 having its config merged at the top level (#3104)

  • Updated dependencies [820daab]:

    • svelte2tsx@0.7.61

0.18.3

Patch Changes

  • fix: load esm version of Vite (#3065)

  • perf: remove lodash (#3038)

  • feat: provide utils for svelte-check tsgo integration (#3036)

  • Updated dependencies [7a3464b, a2561fc, 459d031]:

    • @sveltejs/load-config@0.2.0
    • svelte2tsx@0.7.57

0.18.2

Patch Changes

  • fix: don't show type inlay hint for component inside snippets (#3041)

  • fix: correct 'occured' typo in svelte:boundary onerror description (shown in editor IntelliSense) (#3039)

  • feat: support reading Svelte config from vite.config.js/ts (#3031)

  • fix: mark optional members with a trailing ? in completion labels (#3044)

  • Updated dependencies [151cf45]:

    • @sveltejs/load-config@0.1.1

0.18.1

Patch Changes

  • feat: add support for svelte config ts/mts files (#3009)

  • feat: support CSS completions in nested style tags (#3022)

  • fix: support prettier.useEditorConfig setting (#3026)

  • fix: prevent > in expression affects HTML folding (#3029)

  • Updated dependencies [86fafb1, 6bd8b17, 4a064e5, e9f4ce9, 3474048]:

    • svelte2tsx@0.7.56

0.18.0

Minor Changes

  • feat: typescript 6.0 support (#2985)

Patch Changes

  • Updated dependencies [29e2894]:
    • svelte2tsx@0.7.55

0.17.31

Patch Changes

  • fix: prevent duplicate diagnostics (#3000)

  • fix: properly place svelte-ignore comment in quickfix when <script module> presents (#3011)

  • fix: prevent incorrect $types imports being injected when moving +page.svelte files (#3010)

  • fix: prevent extra script indentation when inserting svelte-ignore comments (#3011)

  • fix: provide tsconfig.json diagnostics for svelte-check (#3005)

  • Updated dependencies [8b103ba]:

    • svelte2tsx@0.7.54

0.17.30

Patch Changes

  • perf: micro-optimizations in hot paths (#2960)

  • fix: prevent config loading message in svelte-check --incremental (#2974)

  • perf: enable incremental TypeScript reparsing via getChangeRange (#2961)

  • perf: various optimization with ast walk (#2969)

  • feat: pull diagnostics support (#2978)

  • fix: prevent error with escape sequence in attribute (#2968)

  • fix: typescript 6.0 compatibility (#2988)

  • Updated dependencies [5b9a4ac]:

    • svelte2tsx@0.7.53

0.17.29

Patch Changes

  • fix: pass filename to warningFilter (#2959)

0.17.28

Patch Changes

  • feat: support for comments in tags (#2944)

0.17.27

Patch Changes

  • fix: handle relative imports reaching outside working directory when using --incremental/--tsgo flags (#2942)

  • fix: extract style/script tag followed by destructuring in the template (#2921)

  • fix: support SvelteKit zero types in svelte-check --incremental (#2939)

  • Updated dependencies [6a04679, b914d01]:

    • svelte2tsx@0.7.49

0.17.26

Patch Changes

  • feat: add links to diagnostic error codes via codeDescription (#2936)

  • chore: provide utils for svelte-check (#2932)

  • Updated dependencies [0b8af82]:

    • svelte2tsx@0.7.48

0.17.25

Patch Changes

  • fix: apply text synchronize change in order (#2927)

0.17.24

Patch Changes

  • perf: only parse html once in a batch update (#2923)

  • feat: support emmet.extensionsPath config (#2918)

  • feat: custom element JSDoc documentation for completion/hover (#2879)

  • fix: compatibility with prettier-plugin-tailwindcss in monorepo (#2925)

  • Updated dependencies [e2f09eb]:

    • svelte2tsx@0.7.47

0.17.23

Patch Changes

  • perf: move return statement in getCompletions so it returns immediately if possible (#2899)

  • perf: avoid global completion in component start tag (#2904)

  • perf: optimize path normalization (#2907)

  • perf: optimize module resolution cache invalidation check (#2902)

  • fix: add some limit to store auto-import (#2909)

  • [perf]: avoid re-reacting completion items for svelte syntax every time getCompletionsWithRegardToTriggerCharacter is called (#2900)

  • Updated dependencies [b6ebbd8]:

    • svelte2tsx@0.7.46

0.17.22

Patch Changes

  • feat: support hierarchical document symbols (#2817)

  • fix: use moustache for svelte5 onhandler completion (#2883)

  • feat: quick fix for adding lang="ts" (#2882)

  • fix: support for @nativescript-community/svelte-native (#2867)

  • fix: always treat a script tag as top-level if it's the first tag in the file (#2886)

  • fix: restrict emmet completion with emmet specific triggerCharacter (#2873)

  • fix: support experimental feature in "Show compiled Code" (#2884)

  • feat: implement 'source.removeUnusedImports' code action (#2875)

0.17.21

Patch Changes

  • perf: check if file content changed in tsconfig file watch (#2859)

  • Updated dependencies [7468286]:

    • svelte2tsx@0.7.45

0.17.20

Patch Changes

  • perf: tweak some snapshot hot paths (#2852)

  • perf: more precise module cache invalidation (#2853)

  • Updated dependencies [f799839, dec37ea]:

    • svelte2tsx@0.7.44

See https://github.com/sveltejs/language-tools/releases