refactor(language_server): use minimal text edit for `ServerFormatter` #13960

Sysix · 2025-09-20T18:45:09Z

The Server now computed the minimal Span range, which is modified and send it to the client.
This is helpful for big files where only one little change happened.
Instead of sending the full text, the server sends only the minimal change.

Sysix · 2025-09-20T18:45:25Z

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codspeed-hq · 2025-09-20T18:50:07Z

CodSpeed Instrumentation Performance Report

Merging #13960 will not alter performance

_{Comparing 09-20-refactor_language_server_use_minimal_text_edit_for_serverformatter_ (0c93f33) with main (2a7d5d3)¹}

Summary

✅ 37 untouched

No successful run was found on main (0c93f33) during the generation of this report, so 2a7d5d3 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

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Pull Request Overview

This PR refactors the ServerFormatter to compute and send minimal text edits instead of replacing the entire file content. This optimization improves performance for large files where only small changes occur during formatting.

Implements a compute_minimal_text_edit function that finds the smallest diff between original and formatted text
Updates the formatter to use precise byte ranges and positions instead of replacing the entire file
Adds comprehensive test coverage for the minimal text edit algorithm

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
crates/oxc_language_server/src/formatter/server_formatter.rs	Implements minimal text edit computation and updates formatter to use precise ranges
crates/oxc_language_server/Cargo.toml	Adds dependency on oxc_data_structures with rope feature for text positioning

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crates/oxc_language_server/src/formatter/server_formatter.rs

camc314 · 2025-09-21T17:21:00Z

Merge activity

Sep 21, 5:20 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
Sep 21, 5:21 PM UTC: camc314 added this pull request to the Graphite merge queue.
Sep 21, 5:33 PM UTC: Merged by the Graphite merge queue.

#13960) closes #13629 The Server now computed the minimal Span range, which is modified and send it to the client. This is helpful for big files where only one little change happened. Instead of sending the full text, the server sends only the minimal change.

## [1.17.0] - 2025-09-23 ### 🚀 Features - f47f978 linter/plugins: Add `definePlugin` API (#14008) (overlookmotel) - 3e117c6 linter/plugins: Add `defineRule` API (#13945) (overlookmotel) - 2dc8adb linter/plugins: Add `createOnce` API (#13944) (overlookmotel) - bef8753 linter/plugins: ESTree-compatible AST for JS plugins (#13942) (overlookmotel) - 55c2e11 editor: Add `oxc.fmt.experimental` flag (#13923) (Sysix) - a21ff54 language_server: Introduce `ServerFormatter` (#13700) (Sysix) - a14aa79 npm/oxlint: Convert to ES modules (#13876) (Boshen) - 15eb326 linter: Add `vue/no-required-prop-with-default` rule (#13613) (yefan) - 5d3ba00 linter: Add `vue/require-typed-ref` rule (#13857) (yefan) - b52389a node: Bump `engines` field to require Node.js 20.19.0+ for ESM support (#13879) (Copilot) - 8221a01 linter: Add `eslint/no-misleading-character-class` (#13365) (Sysix) - c75ae8c linter/plugins: Add options to `Context` (#13810) (overlookmotel) - 53d04dd linter: Convert `oxlint` to NAPI app (#13723) (overlookmotel) ### 🐛 Bug Fixes - 1f4be38 napi/parser: Generate `.d.mts` extension for types (#14038) (Daniel Roe) - a018756 linter/plugins: Pin `tsdown` dependency to 0.15.1 (#14005) (overlookmotel) - b8790c2 language_server: Output correct position for parser & semantic errors (#14010) (Sysix) - 4d3c6e1 linter: Support let-chains in codegen node type detection (#14006) (camc314) - a34918a linter/plugins: Avoid lint warnings compiling WASM or big-endian (#13968) (overlookmotel) - 27022ab linter/switch-case-braces: Add support for string including colon on case expression (#13687) (Lukinoh) - dd3843f linter: Set package version in `package.json` (#13890) (overlookmotel) - fa866b3 linter: Sort optimized/unoptimized diagnostics before comparison (#13850) (camc314) - fac7624 linter/plugins: Improve error for no JS plugins (#13858) (overlookmotel) ### 🚜 Refactor - bb040bc parser, linter: Replace `.mjs` files with `.js` (#14045) (overlookmotel) - b353750 linter/plugins: Remove unnecessary `Serialize` derives (#14031) (overlookmotel) - 0d48511 linter/plugins: Improve handling `Context` method calls in `createOnce` (#14032) (overlookmotel) - 36ac0fb language_server: Don't create `mpsc` channel (#14011) (Sysix) - 2e9ae3f linter: Make disable directives own the rule name (#13987) (camc314) - 6bc7664 oxlint: Run oxlint before tsgolint (#13519) (camc314) - 0c93f33 language_server: Use minimal text edit for `ServerFormatter` (#13960) (Sysix) - 823cb57 langauge_server: Move `Backend` into own file (#13955) (Sysix) - dc700f5 language_server: Introduce `LSPFileSystem` (#13731) (Sysix) - 42e2c1d linter: Remove `Rc` from `DisableDirectives` (#13924) (camc314) - ac3e9e9 napi/parser: Move JS code into `src-js` directory (#13899) (overlookmotel) - e90bfe3 linter: Remove double reference in unicorn/error-message (#13916) (camc314) - 83791a0 linter: Remove double reference in vue/jsx-no-undef (#13915) (camc314) - ebd22de linter: Remove double reference in vue/require-typed-ref (#13914) (camc314) - 873e231 language_server: Move `needs_linter_restart` to `ServerLinter` (#13834) (Sysix) - 7e0d736 linter/plugins: Rename `--experimental-js-plugins` to `--js-plugins` (#13860) (overlookmotel) - 6245c8c linter/plugins: Make `Context` properties getters (#13809) (overlookmotel) - a2342a6 linter/plugins: Import named in tests (#13807) (overlookmotel) ### 📚 Documentation - 601c876 linter: Add comment explaining why Mimalloc is feature-gated (#14037) (overlookmotel) ### ⚡ Performance - 4d04c6e linter/plugins: Flatten `LintFileResult` fields (#14033) (overlookmotel) - 06363e0 linter: Add node type codegen support for `match node.kind()` (#13736) (camchenry) - a79af0a linter: Replace `for (... of ...)` loops (#13913) (overlookmotel) - b53292d linter: Use unstable sort where possible (#13818) (sapphi-red) ### 🎨 Styling - 8083740 linter: Import `Serialize` at top level (#14030) (overlookmotel) ### 🧪 Testing - b807b6f language_server: Skip formatter test on windows (#13986) (Sysix) - 2600858 language_server: Add Tester for ServerFormatter (#13969) (Sysix) - 37aadf0 language_server: Add `test_and_snapshot_multiple_file` (#13966) (Sysix) - ad14a41 editor: Fix test setup (#13929) (Sysix) - f51240e linter/plugins: Tests for different import styles (#13859) (overlookmotel) - 407c95e linter/plugins: Check `this` is undefined in visit functions (#13811) (overlookmotel) - f023a22 linter/plugins: Include stack trace in plugin loading errors (#13808) (overlookmotel) ### 💼 Other - 0630d68 linter: Build `oxlint` locally with Mimalloc in release mode (#14034) (overlookmotel) Co-authored-by: camc314 <18101008+camc314@users.noreply.github.com>

github-actions bot added A-editor Area - Editor and Language Server C-cleanup Category - technical debt or refactoring. Solution not expected to change behavior labels Sep 20, 2025

Sysix force-pushed the 09-20-refactor_language_server_use_minimal_text_edit_for_serverformatter_ branch 3 times, most recently from 44488e8 to 1644eea Compare September 21, 2025 10:22

Sysix marked this pull request as ready for review September 21, 2025 10:23

Sysix requested a review from camc314 as a code owner September 21, 2025 10:23

Sysix requested review from Copilot and removed request for camc314 September 21, 2025 10:23

Copilot AI reviewed Sep 21, 2025

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This was referenced Sep 21, 2025

test(language_server): add test_and_snapshot_multiple_file #13966

Merged

test(language_server): add Tester for ServerFormatter #13969

Merged

Sysix assigned camc314 Sep 21, 2025

Sysix mentioned this pull request Sep 21, 2025

fix(language_server): don't lint file on code action when it is already ignored #13976

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camc314 added the 0-merge Merge with Graphite Merge Queue label Sep 21, 2025

graphite-app bot force-pushed the 09-20-refactor_language_server_use_minimal_text_edit_for_serverformatter_ branch from 1644eea to a96c05f Compare September 21, 2025 17:21

graphite-app bot force-pushed the 09-20-refactor_language_server_use_minimal_text_edit_for_serverformatter_ branch from a96c05f to 0c93f33 Compare September 21, 2025 17:27

graphite-app bot merged commit 0c93f33 into main Sep 21, 2025
27 checks passed

graphite-app bot deleted the 09-20-refactor_language_server_use_minimal_text_edit_for_serverformatter_ branch September 21, 2025 17:33

graphite-app bot removed the 0-merge Merge with Graphite Merge Queue label Sep 21, 2025

Boshen mentioned this pull request Sep 23, 2025

release(oxlint): v1.17.0 #14054

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refactor(language_server): use minimal text edit for `ServerFormatter` #13960

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Sysix commented Sep 20, 2025 •

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refactor(language_server): use minimal text edit for `ServerFormatter` #13960

refactor(language_server): use minimal text edit for `ServerFormatter` #13960

Sysix commented Sep 20, 2025 •

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