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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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('^' + ".*" + '
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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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('^' + ".*" + '
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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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('^' + ".*" + '
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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

About

The greatest view engine for the modern web

Topics

Resources

Stars

16 stars

Watchers

2 watching

Forks

Releases

Sponsor this project

Used by

Contributors

Languages

, '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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Butterfloat

Butterfloat is a Knockout-inspired view engine using modern ESM via Typescript and pure RxJS observables.

"The greatest view engine the web has ever seen."

Getting Started starts a gentle tour of Butterfloat features.

A Usage Example

A complex component with embedded state may look something like this:

import{ComponentContext,ObservableEvent,butterfly,jsx}from'butterfloat'import{map}from'rxjs'interfaceGardenProps{}interfaceGardenEvents{rake: ObservableEvent<MouseEvent>}functionGarden(props: GardenProps,{ bindEffect, events }: ComponentContext<GardenEvents>,){const[money,setMoney]=butterfly(1)const[labor,setLabor]=butterfly(0)constmoneyPercent=money.pipe(map((money)=>money.toLocaleString(undefined,{style: 'percent '})),)constlaborPercent=labor.pipe(map((labor)=>labor.toLocaleString(undefined,{style: 'percent'})),)bindEffect(events.rake,()=>{setMoney((money)=>money-0.15)setLabor((labor)=>labor+0.3)})return(<divclass="garden"><divclass="stat-label">Money</div><progresstitle="Money"bind={{value: money,innerText: moneyPercent}}/><divclass="stat-label">Labor</div><progresstitle="Labor"bind={{value: labor,innerText: laborPercent}}/><divclass="section-label">Activities</div><buttontype="button"events={{click: events.rake}}>
Rake
</button></div>)}

This may look like React at first glance, especially the intentional surface level resemblance of butterfly to useState and bindEffect to useEffect. This exact example is refactored in ways that a React component can't be (moving the butterfly state to its own "view model") in the State Management documentation, but it is suggested you take the scenic route and start with Getting Started.

Other Examples

Fresh projects built with Butterfloat:

Example projects migrated from Knockout:

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