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A simple JavaScript script for understanding the JavaScript runtime. It functions as a poor man's JavaScript runtime environment.

I wrote it as a way to understand how node.js works and to answer the question: is it possible to have a completely single-threaded implementation of node.js. The answer, as it turns out, is yes and the implementation is quite simple.

This script runs in Mozilla's Rhino JavaScript implementation which can be download at http://www.mozilla.org/rhino/download.html.

The code is written for clarity, not efficiency. It uses no locks and is single threaded. Don't write anything CPU intensive because even a simple setTimeout operation uses 100% CPU.

As of this first version, the interpreter quits if there are no more tasks.

Execution

At the command prompt:

$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details

  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided runtime using the functions defined in lib.js.

License

The code is in public domain. Do what you will. As with all other Free Software licences, it comes with NO WARRANTY. Use at your own peril.

About

A simple JavaScript runtime that runs in JavaScript

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3 stars

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1 watching

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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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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
Stars
3 stars
Watchers
1 watching
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0 forks
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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('^' + ".*" + '

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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
Stars
3 stars
Watchers
1 watching
Forks
0 forks
Report repository
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Packages
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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('^' + ".*" + '

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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
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3 stars
Watchers
1 watching
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0 forks
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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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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
Stars
3 stars
Watchers
1 watching
Forks
0 forks
Report repository
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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('^' + ".*" + '

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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
Stars
3 stars
Watchers
1 watching
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0 forks
Report repository
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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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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
Stars
3 stars
Watchers
1 watching
Forks
0 forks
Report repository
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Packages
Contributors
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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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A simple JavaScript script for understanding the JavaScript runtime.
It functions as a poor man's JavaScript runtime environment.
I wrote it as a way to understand how node.js works and to answer the
question: is it possible to have a completely single-threaded
implementation of node.js. The answer, as it turns out, is yes and
the implementation is quite simple.
This script runs in Mozilla's Rhino JavaScript implementation which
can be download at http://www.mozilla.org/rhino/download.html.
The code is written for clarity, not efficiency. It uses no locks and
is single threaded. Don't write anything CPU intensive because even a
simple setTimeout operation uses 100% CPU.
As of this first version, the interpreter quits if there are no more
tasks.
Execution
At the command prompt:
$ java -jar js.jar -e "load('runtime.js'); load('lib.js'); load('example.js');"

Details
  • runtime.js - contains the core event loop. Really short.
  • lib.js - contains a few "libraries" built on top of the runtime.
  • example.js - a few simple examples that execute in the provided
runtime using the functions defined in lib.js.
License
The code is in public domain. Do what you will. As with all other
Free Software licences, it comes with NO WARRANTY. Use at your own
peril.
About
A simple JavaScript runtime that runs in JavaScript
Resources
Readme
Activity
Stars
3 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages