src: make compile cache zstd dictionary reproducible - #17

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src: make compile cache zstd dictionary reproducible#17
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@lemirelemire commented Jun 14, 2026•
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src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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src: make compile cache zstd dictionary reproducible - #17
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lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
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@lemirelemire
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Jun 14, 2026•

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@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
src: make compile cache zstd dictionary reproducible - #17
Open
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
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@lemirelemire
commented
Jun 14, 2026•

edited

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@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
src: make compile cache zstd dictionary reproducible - #17
Open
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Conversation
@lemire
@lemirelemire
commented
Jun 14, 2026•

edited

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@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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src: make compile cache zstd dictionary reproducible - #17
Open
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Conversation
@lemire
@lemirelemire
commented
Jun 14, 2026•

edited

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Collaborator
self-explanatory
@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
src: make compile cache zstd dictionary reproducible - #17
Open
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
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@lemire
@lemirelemire
commented
Jun 14, 2026•

edited

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Collaborator
self-explanatory
@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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1 participant

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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src: make compile cache zstd dictionary reproducible - #17
Open
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
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@lemirelemire
commented
Jun 14, 2026•

edited

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self-explanatory
@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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src: make compile cache zstd dictionary reproducible - #17
Open
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
Open
src: make compile cache zstd dictionary reproducible#17
lemire wants to merge 1 commit into
anonrig:compile-cache-perffrom 
lemire:compile-cache-dict-repro
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@lemire
@lemirelemire
commented
Jun 14, 2026•

edited

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self-explanatory
@lemire
src: make compile cache zstd dictionary reproducible
65031d6
Add tools/train_compile_cache_dict.mjs, a maintainer tool that
regenerates src/compile_cache_zstd.dict end to end, and replace the
embedded dictionary with its byte-for-byte reproducible output.
The script walks a fixed in-tree corpus, harvests a V8 code cache from
each module via vm.compileFunction with produceCachedData (the same
shape the CommonJS loader produces at runtime), feeds the blobs to
`zstd --train`, and writes the 16 KiB dictionary in place. The output
is byte-for-byte stable when node is run with --predictable (the script
re-execs itself with it, since V8 otherwise randomizes the string hash
seed and that seed leaks into cachedData), the corpus and its sorted
order are fixed, and the node build is fixed.
This documents and makes reproducible exactly how the embedded
dictionary was created, so a future maintainer can regenerate it (e.g.
after a V8 or corpus change) and review the resulting diff.
Refs: nodejs#63861
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