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🤖 Migrate syntax highlighting to Shiki for performance (#342)
## Summary Replace per-line Prism highlighting with chunk-based Shiki highlighting, adding lazy language loading and fixing review note bugs. ## Key Changes ### 1. Chunk-Based Highlighting (Performance) Old approach highlighted each line individually with Prism, causing 100-400ms for 200-line diffs. New approach groups consecutive lines by type (add/remove/context) and highlights each chunk once with Shiki, reducing time to 10-75ms (3-10x faster). ### 2. Lazy Language Loading Shiki supports 306 languages vs Prism's 19. Languages load on-demand when first used - initialization takes 13ms, with 1-4ms per new language on first use. All 306 languages available without startup penalty. ### 3. Fixed Review Note Bug Review notes were sending empty content to chat because the `content` field was set to empty string but still used. Now extracts content from the lines array. Also added line elision for long selections (shows first/last lines with "..." for >3 lines). ### 4. Fixed HTML Line Extraction Regex for extracting lines from Shiki's HTML output broke on nested spans. Replaced with split-on-newlines approach that finds the last closing tag properly. ## Implementation - `shikiHighlighter.ts`: Lazy-loaded singleton with race-safe initialization - `diffChunking.ts`: Groups consecutive diff lines by type - `highlightDiffChunk.ts`: Async chunk highlighting with on-demand language loading - `DiffRenderer.tsx`: Fixed review note content extraction, added line elision ## Testing - Added 15 integration tests for chunk-based highlighting - Added 9 integration tests for review notes - All tests use real Shiki (no mocks) - Verified race-safe concurrent language loading ## Performance **Before (Prism, per-line):** - 100-400ms for 200-line diff - 19 languages supported **After (Shiki, chunk-based):** - 10-75ms for 200-line diff (3-10x faster) - 306 languages supported - 13ms initialization (0 languages preloaded) - 1-4ms per new language on first use ## Dependencies Kept `react-syntax-highlighter` for chat message code blocks in MarkdownComponents. Diff rendering now uses Shiki directly. _Generated with `cmux`_
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‎bun.lock‎

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@@ -8,6 +8,7 @@
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"@ai-sdk/openai": "^2.0.52",
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"@emotion/react": "^11.14.0",
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"@emotion/styled": "^11.14.1",
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"@types/react-syntax-highlighter": "^15.5.13",
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"ai": "^5.0.72",
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"ai-tokenizer": "^1.0.3",
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"cmdk": "^1.0.0",
@@ -32,6 +33,7 @@
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"rehype-sanitize": "^6.0.0",
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"remark-gfm": "^4.0.1",
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"remark-math": "^6.0.0",
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"shiki": "^3.13.0",
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"source-map-support": "^0.5.21",
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"undici": "^7.16.0",
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"write-file-atomic": "^6.0.0",
@@ -58,7 +60,6 @@
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"@types/minimist": "^1.2.5",
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"@types/react": "^18.2.0",
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"@types/react-dom": "^18.2.0",
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"@types/react-syntax-highlighter": "^15.5.13",
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"@types/write-file-atomic": "^4.0.3",
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"@typescript-eslint/eslint-plugin": "^8.44.1",
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"@typescript-eslint/parser": "^8.44.1",
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"@shikijs/core": ["@shikijs/core@3.13.0", "", { "dependencies": { "@shikijs/types": "3.13.0", "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4", "hast-util-to-html": "^9.0.5" } }, "sha512-3P8rGsg2Eh2qIHekwuQjzWhKI4jV97PhvYjYUzGqjvJfqdQPz+nMlfWahU24GZAyW1FxFI1sYjyhfh5CoLmIUA=="],
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"@shikijs/engine-javascript": ["@shikijs/engine-javascript@3.13.0", "", { "dependencies": { "@shikijs/types": "3.13.0", "@shikijs/vscode-textmate": "^10.0.2", "oniguruma-to-es": "^4.3.3" } }, "sha512-Ty7xv32XCp8u0eQt8rItpMs6rU9Ki6LJ1dQOW3V/56PKDcpvfHPnYFbsx5FFUP2Yim34m/UkazidamMNVR4vKg=="],
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"@shikijs/engine-oniguruma": ["@shikijs/engine-oniguruma@3.13.0", "", { "dependencies": { "@shikijs/types": "3.13.0", "@shikijs/vscode-textmate": "^10.0.2" } }, "sha512-O42rBGr4UDSlhT2ZFMxqM7QzIU+IcpoTMzb3W7AlziI1ZF7R8eS2M0yt5Ry35nnnTX/LTLXFPUjRFCIW+Operg=="],
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"@shikijs/langs": ["@shikijs/langs@3.13.0", "", { "dependencies": { "@shikijs/types": "3.13.0" } }, "sha512-672c3WAETDYHwrRP0yLy3W1QYB89Hbpj+pO4KhxK6FzIrDI2FoEXNiNCut6BQmEApYLfuYfpgOZaqbY+E9b8wQ=="],
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"@shikijs/themes": ["@shikijs/themes@3.13.0", "", { "dependencies": { "@shikijs/types": "3.13.0" } }, "sha512-Vxw1Nm1/Od8jyA7QuAenaV78BG2nSr3/gCGdBkLpfLscddCkzkL36Q5b67SrLLfvAJTOUzW39x4FHVCFriPVgg=="],
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"@shikijs/types": ["@shikijs/types@3.13.0", "", { "dependencies": { "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4" } }, "sha512-oM9P+NCFri/mmQ8LoFGVfVyemm5Hi27330zuOBp0annwJdKH1kOLndw3zCtAVDehPLg9fKqoEx3Ht/wNZxolfw=="],
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"@shikijs/vscode-textmate": ["@shikijs/vscode-textmate@10.0.2", "", {}, "sha512-83yeghZ2xxin3Nj8z1NMd/NCuca+gsYXswywDy5bHvwlWL8tpTQmzGeUuHd9FC3E/SBEMvzJRwWEOz5gGes9Qg=="],
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"@sideway/address": ["@sideway/address@4.1.5", "", { "dependencies": { "@hapi/hoek": "^9.0.0" } }, "sha512-IqO/DUQHUkPeixNQ8n0JA6102hT9CmaljNTPmQ1u8MEhBo/R4Q8eKLN/vGZxuebwOroDB4cbpjheD4+/sKFK4Q=="],
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"@sideway/formula": ["@sideway/formula@3.0.1", "", {}, "sha512-/poHZJJVjx3L+zVD6g9KgHfYnb443oi7wLu/XKojDviHy6HOEOA6z1Trk5aR1dGcmPenJEgb2sK2I80LeS3MIg=="],
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"hast-util-sanitize": ["hast-util-sanitize@5.0.2", "", { "dependencies": { "@types/hast": "^3.0.0", "@ungap/structured-clone": "^1.0.0", "unist-util-position": "^5.0.0" } }, "sha512-3yTWghByc50aGS7JlGhk61SPenfE/p1oaFeNwkOOyrscaOkMGrcW9+Cy/QAIOBpZxP1yqDIzFMR0+Np0i0+usg=="],
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"hast-util-to-html": ["hast-util-to-html@9.0.5", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "ccount": "^2.0.0", "comma-separated-tokens": "^2.0.0", "hast-util-whitespace": "^3.0.0", "html-void-elements": "^3.0.0", "mdast-util-to-hast": "^13.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0", "stringify-entities": "^4.0.0", "zwitch": "^2.0.4" } }, "sha512-OguPdidb+fbHQSU4Q4ZiLKnzWo8Wwsf5bZfbvu7//a9oTYoqD/fWpe96NuHkoS9h0ccGOTe0C4NGXdtS0iObOw=="],
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"hast-util-to-jsx-runtime": ["hast-util-to-jsx-runtime@2.3.6", "", { "dependencies": { "@types/estree": "^1.0.0", "@types/hast": "^3.0.0", "@types/unist": "^3.0.0", "comma-separated-tokens": "^2.0.0", "devlop": "^1.0.0", "estree-util-is-identifier-name": "^3.0.0", "hast-util-whitespace": "^3.0.0", "mdast-util-mdx-expression": "^2.0.0", "mdast-util-mdx-jsx": "^3.0.0", "mdast-util-mdxjs-esm": "^2.0.0", "property-information": "^7.0.0", "space-separated-tokens": "^2.0.0", "style-to-js": "^1.0.0", "unist-util-position": "^5.0.0", "vfile-message": "^4.0.0" } }, "sha512-zl6s8LwNyo1P9uw+XJGvZtdFF1GdAkOg8ujOw+4Pyb76874fLps4ueHXDhXWdk6YHQ6OgUtinliG7RsYvCbbBg=="],
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"hast-util-to-parse5": ["hast-util-to-parse5@8.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "comma-separated-tokens": "^2.0.0", "devlop": "^1.0.0", "property-information": "^6.0.0", "space-separated-tokens": "^2.0.0", "web-namespaces": "^2.0.0", "zwitch": "^2.0.0" } }, "sha512-3KKrV5ZVI8if87DVSi1vDeByYrkGzg4mEfeu4alwgmmIeARiBLKCZS2uw5Gb6nU9x9Yufyj3iudm6i7nl52PFw=="],
@@ -2043,6 +2060,10 @@
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"onetime": ["onetime@5.1.2", "", { "dependencies": { "mimic-fn": "^2.1.0" } }, "sha512-kbpaSSGJTWdAY5KPVeMOKXSrPtr8C8C7wodJbcsd51jRnmD+GZu8Y0VoU6Dm5Z4vWr0Ig/1NKuWRKf7j5aaYSg=="],
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"oniguruma-parser": ["oniguruma-parser@0.12.1", "", {}, "sha512-8Unqkvk1RYc6yq2WBYRj4hdnsAxVze8i7iPfQr8e4uSP3tRv0rpZcbGUDvxfQQcdwHt/e9PrMvGCsa8OqG9X3w=="],
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"oniguruma-to-es": ["oniguruma-to-es@4.3.3", "", { "dependencies": { "oniguruma-parser": "^0.12.1", "regex": "^6.0.1", "regex-recursion": "^6.0.2" } }, "sha512-rPiZhzC3wXwE59YQMRDodUwwT9FZ9nNBwQQfsd1wfdtlKEyCdRV0avrTcSZ5xlIvGRVPd/cx6ZN45ECmS39xvg=="],
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"open": ["open@8.4.2", "", { "dependencies": { "define-lazy-prop": "^2.0.0", "is-docker": "^2.1.1", "is-wsl": "^2.2.0" } }, "sha512-7x81NCL719oNbsq/3mh+hVrAWmFuEYUqrq/Iw3kUzH8ReypT9QQ0BLoJS7/G9k6N81XjW4qHWtjWwe/9eLy1EQ=="],
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"optionator": ["optionator@0.9.4", "", { "dependencies": { "deep-is": "^0.1.3", "fast-levenshtein": "^2.0.6", "levn": "^0.4.1", "prelude-ls": "^1.2.1", "type-check": "^0.4.0", "word-wrap": "^1.2.5" } }, "sha512-6IpQ7mKUxRcZNLIObR0hz7lxsapSSIYNZJwXPGeF0mTVqGKFIXj1DQcMoT22S3ROcLyY/rz0PWaWZ9ayWmad9g=="],
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"refractor": ["refractor@3.6.0", "", { "dependencies": { "hastscript": "^6.0.0", "parse-entities": "^2.0.0", "prismjs": "~1.27.0" } }, "sha512-MY9W41IOWxxk31o+YvFCNyNzdkc9M20NoZK5vq6jkv4I/uh2zkWcfudj0Q1fovjUQJrNewS9NMzeTtqPf+n5EA=="],
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"regex": ["regex@6.0.1", "", { "dependencies": { "regex-utilities": "^2.3.0" } }, "sha512-uorlqlzAKjKQZ5P+kTJr3eeJGSVroLKoHmquUj4zHWuR+hEyNqlXsSKlYYF5F4NI6nl7tWCs0apKJ0lmfsXAPA=="],
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"regex-recursion": ["regex-recursion@6.0.2", "", { "dependencies": { "regex-utilities": "^2.3.0" } }, "sha512-0YCaSCq2VRIebiaUviZNs0cBz1kg5kVS2UKUfNIx8YVs1cN3AV7NTctO5FOKBA+UT2BPJIWZauYHPqJODG50cg=="],
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"regex-utilities": ["regex-utilities@2.3.0", "", {}, "sha512-8VhliFJAWRaUiVvREIiW2NXXTmHs4vMNnSzuJVhscgmGav3g9VDxLrQndI3dZZVVdp0ZO/5v0xmX516/7M9cng=="],
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"regexp.prototype.flags": ["regexp.prototype.flags@1.5.4", "", { "dependencies": { "call-bind": "^1.0.8", "define-properties": "^1.2.1", "es-errors": "^1.3.0", "get-proto": "^1.0.1", "gopd": "^1.2.0", "set-function-name": "^2.0.2" } }, "sha512-dYqgNSZbDwkaJ2ceRd9ojCGjBq+mOm9LmtXnAnEGyHhN/5R7iDW2TRw3h+o/jCFxus3P2LfWIIiwowAjANm7IA=="],
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"rehype-katex": ["rehype-katex@7.0.1", "", { "dependencies": { "@types/hast": "^3.0.0", "@types/katex": "^0.16.0", "hast-util-from-html-isomorphic": "^2.0.0", "hast-util-to-text": "^4.0.0", "katex": "^0.16.0", "unist-util-visit-parents": "^6.0.0", "vfile": "^6.0.0" } }, "sha512-OiM2wrZ/wuhKkigASodFoo8wimG3H12LWQaH8qSPVJn9apWKFSH3YOCtbKpBorTVw/eI7cuT21XBbvwEswbIOA=="],
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"shell-quote": ["shell-quote@1.8.3", "", {}, "sha512-ObmnIF4hXNg1BqhnHmgbDETF8dLPCggZWBjkQfhZpbszZnYur5DUljTcCHii5LC3J5E0yeO/1LIMyH+UvHQgyw=="],
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"shiki": ["shiki@3.13.0", "", { "dependencies": { "@shikijs/core": "3.13.0", "@shikijs/engine-javascript": "3.13.0", "@shikijs/engine-oniguruma": "3.13.0", "@shikijs/langs": "3.13.0", "@shikijs/themes": "3.13.0", "@shikijs/types": "3.13.0", "@shikijs/vscode-textmate": "^10.0.2", "@types/hast": "^3.0.4" } }, "sha512-aZW4l8Og16CokuCLf8CF8kq+KK2yOygapU5m3+hoGw0Mdosc6fPitjM+ujYarppj5ZIKGyPDPP1vqmQhr+5/0g=="],
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"side-channel": ["side-channel@1.1.0", "", { "dependencies": { "es-errors": "^1.3.0", "object-inspect": "^1.13.3", "side-channel-list": "^1.0.0", "side-channel-map": "^1.0.1", "side-channel-weakmap": "^1.0.2" } }, "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw=="],
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"side-channel-list": ["side-channel-list@1.0.0", "", { "dependencies": { "es-errors": "^1.3.0", "object-inspect": "^1.13.3" } }, "sha512-FCLHtRD/gnpCiCHEiJLOwdmFP+wzCmDEkc9y7NsYxeF4u7Btsn1ZuwgwJGxImImHicJArLP4R0yX4c2KCrMrTA=="],

‎jest.config.js‎

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},
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],
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},
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// Transform ESM modules (like shiki) to CommonJS for Jest
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transformIgnorePatterns: ["node_modules/(?!(shiki)/)"],
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// Run tests in parallel (use 50% of available cores, or 4 minimum)
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maxWorkers: "50%",
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// Force exit after tests complete to avoid hanging on lingering handles

‎package.json‎

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"@ai-sdk/openai": "^2.0.52",
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"@emotion/react": "^11.14.0",
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"@emotion/styled": "^11.14.1",
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"@types/react-syntax-highlighter": "^15.5.13",
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"ai": "^5.0.72",
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"ai-tokenizer": "^1.0.3",
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"cmdk": "^1.0.0",
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"rehype-sanitize": "^6.0.0",
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"remark-gfm": "^4.0.1",
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"remark-math": "^6.0.0",
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"shiki": "^3.13.0",
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"source-map-support": "^0.5.21",
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"undici": "^7.16.0",
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"write-file-atomic": "^6.0.0",
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"@types/minimist": "^1.2.5",
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"@types/react": "^18.2.0",
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"@types/react-dom": "^18.2.0",
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"@types/react-syntax-highlighter": "^15.5.13",
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"@types/write-file-atomic": "^4.0.3",
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"@typescript-eslint/eslint-plugin": "^8.44.1",
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"@typescript-eslint/parser": "^8.44.1",

‎src/components/RightSidebar/CodeReview/UntrackedStatus.tsx‎

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return () => {
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cancelled = true;
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};
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// eslint-disable-next-line react-hooks/exhaustive-deps
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}, [workspaceId, workspacePath, refreshTrigger]);
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// Close tooltip when clicking outside

‎src/components/shared/DiffRenderer.test.tsx‎

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/**
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* Tests for DiffRenderer components
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*
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* These are integration tests that verify the review note feature works end-to-end.
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* We test the line extraction and formatting logic that ReviewNoteInput uses internally.
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*/
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describe("SelectableDiffRenderer review notes", () => {
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it("should extract correct line content for review notes", () => {
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// Simulate the internal review note building logic
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// This is what happens when user clicks comment button and submits
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const content = "+const x = 1;\n+const y = 2;\n const z = 3;";
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const lines = content.split("\n").filter((line) => line.length > 0);
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// Simulate what ReviewNoteInput does
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const lineData = [
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{ index: 0, type: "add" as const, lineNum: 1 },
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{ index: 1, type: "add" as const, lineNum: 2 },
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{ index: 2, type: "context" as const, lineNum: 3 },
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];
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// Simulate selecting first two lines (the + lines)
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const selectedLines = lineData
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.slice(0, 2)
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.map((lineInfo) => {
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const line = lines[lineInfo.index];
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const indicator = line[0];
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const lineContent = line.slice(1);
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return `${lineInfo.lineNum} ${indicator} ${lineContent}`;
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})
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.join("\n");
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// Verify the extracted content is correct
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expect(selectedLines).toContain("const x = 1");
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expect(selectedLines).toContain("const y = 2");
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expect(selectedLines).not.toContain("const z = 3");
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// Verify format includes line numbers and indicators
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expect(selectedLines).toMatch(/1 \+ const x = 1/);
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expect(selectedLines).toMatch(/2 \+ const y = 2/);
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});
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it("should handle removal lines correctly", () => {
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const content = "-const old = 1;\n+const new = 2;";
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const lines = content.split("\n").filter((line) => line.length > 0);
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const lineData = [
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{ index: 0, type: "remove" as const, lineNum: 10 },
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{ index: 1, type: "add" as const, lineNum: 10 },
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];
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// Extract first line (removal)
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const line = lines[lineData[0].index];
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const indicator = line[0];
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const lineContent = line.slice(1);
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const formattedLine = `${lineData[0].lineNum} ${indicator} ${lineContent}`;
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expect(formattedLine).toBe("10 - const old = 1;");
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expect(lineContent).toBe("const old = 1;");
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});
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it("should handle context lines correctly", () => {
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const content = " unchanged line\n+new line";
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const lines = content.split("\n").filter((line) => line.length > 0);
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const lineData = [
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{ index: 0, type: "context" as const, lineNum: 5 },
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{ index: 1, type: "add" as const, lineNum: 6 },
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];
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// Extract context line
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const line = lines[lineData[0].index];
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const indicator = line[0]; // Should be space
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const lineContent = line.slice(1);
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const formattedLine = `${lineData[0].lineNum} ${indicator} ${lineContent}`;
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expect(formattedLine).toBe("5 unchanged line");
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expect(indicator).toBe(" ");
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});
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it("should handle multiline selection correctly", () => {
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const content = "+line1\n+line2\n+line3\n line4";
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const lines = content.split("\n").filter((line) => line.length > 0);
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const lineData = [
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{ index: 0, type: "add" as const, lineNum: 1 },
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{ index: 1, type: "add" as const, lineNum: 2 },
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{ index: 2, type: "add" as const, lineNum: 3 },
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{ index: 3, type: "context" as const, lineNum: 4 },
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];
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// Simulate selecting lines 0-2 (first 3 additions)
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const selectedLines = lineData
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.slice(0, 3)
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.map((lineInfo) => {
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const line = lines[lineInfo.index];
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const indicator = line[0];
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const lineContent = line.slice(1);
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return `${lineInfo.lineNum} ${indicator} ${lineContent}`;
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})
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.join("\n");
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expect(selectedLines.split("\n")).toHaveLength(3);
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expect(selectedLines).toContain("line1");
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expect(selectedLines).toContain("line2");
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expect(selectedLines).toContain("line3");
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expect(selectedLines).not.toContain("line4");
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});
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it("should format review note with proper structure", () => {
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const filePath = "src/test.ts";
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const lineRange = "10-12";
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const selectedLines = "10 + const x = 1;\n11 + const y = 2;\n12 + const z = 3;";
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const noteText = "These variables should be renamed";
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// This is the format that ReviewNoteInput creates
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const reviewNote = `<review>\nRe ${filePath}:${lineRange}\n\`\`\`\n${selectedLines}\n\`\`\`\n> ${noteText.trim()}\n</review>`;
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expect(reviewNote).toContain("<review>");
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expect(reviewNote).toContain("Re src/test.ts:10-12");
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expect(reviewNote).toContain("const x = 1");
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expect(reviewNote).toContain("const y = 2");
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expect(reviewNote).toContain("const z = 3");
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expect(reviewNote).toContain("These variables should be renamed");
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expect(reviewNote).toContain("</review>");
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});
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describe("line elision for long selections", () => {
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it("should show all lines when selection is ≤3 lines", () => {
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const allLines = ["1 + line1", "2 + line2", "3 + line3"];
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// No elision for 3 lines
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const selectedLines = allLines.join("\n");
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expect(selectedLines).toContain("line1");
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expect(selectedLines).toContain("line2");
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expect(selectedLines).toContain("line3");
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expect(selectedLines).not.toContain("omitted");
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});
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it("should elide middle lines when selection is >3 lines", () => {
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const allLines = ["1 + line1", "2 + line2", "3 + line3", "4 + line4", "5 + line5"];
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// Elide middle 3 lines, show first and last
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const omittedCount = allLines.length - 2;
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const selectedLines = [
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allLines[0],
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` (${omittedCount} lines omitted)`,
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allLines[allLines.length - 1],
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].join("\n");
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expect(selectedLines).toContain("line1");
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expect(selectedLines).not.toContain("line2");
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expect(selectedLines).not.toContain("line3");
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expect(selectedLines).not.toContain("line4");
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expect(selectedLines).toContain("line5");
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expect(selectedLines).toContain("(3 lines omitted)");
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});
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it("should handle exactly 4 lines (edge case)", () => {
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const allLines = [
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"10 + const a = 1;",
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"11 + const b = 2;",
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"12 + const c = 3;",
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"13 + const d = 4;",
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];
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// Should elide 2 middle lines
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const omittedCount = allLines.length - 2;
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const selectedLines = [
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allLines[0],
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` (${omittedCount} lines omitted)`,
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allLines[allLines.length - 1],
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].join("\n");
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expect(selectedLines).toBe("10 + const a = 1;\n (2 lines omitted)\n13 + const d = 4;");
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expect(selectedLines).toContain("const a = 1");
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expect(selectedLines).toContain("const d = 4");
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expect(selectedLines).not.toContain("const b = 2");
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expect(selectedLines).not.toContain("const c = 3");
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expect(selectedLines).toContain("(2 lines omitted)");
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});
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it("should format elision message correctly in review note", () => {
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const filePath = "src/large.ts";
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const lineRange = "10-20";
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const allLines = Array.from({ length: 11 }, (_, i) => `${10 + i} + line${i + 1}`);
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// Elide middle lines
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const omittedCount = allLines.length - 2;
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const selectedLines = [
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allLines[0],
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` (${omittedCount} lines omitted)`,
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allLines[allLines.length - 1],
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].join("\n");
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const noteText = "Review this section";
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const reviewNote = `<review>\nRe ${filePath}:${lineRange}\n\`\`\`\n${selectedLines}\n\`\`\`\n> ${noteText.trim()}\n</review>`;
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expect(reviewNote).toContain("10 + line1");
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expect(reviewNote).toContain("(9 lines omitted)");
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expect(reviewNote).toContain("20 + line11");
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expect(reviewNote).not.toContain("line2");
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expect(reviewNote).not.toContain("line10");
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});
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});
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});

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