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aint

A collection of common runtime predicates that TypeScript actually understands.

Build Statusnpm version

Features

  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.

Installation

npm install aint

Requirements

  • Node.js v.14+

Quick start

import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>

API

Motivation

It's easy to perform a check using lodash or vanilla JavaScript, e.g.

constarray=[1,2,null].filter(Boolean);

The example above will filter out the null value as expected (because null is considered to be faulty).

However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.

aint provides a simple API to test for predicates, while making TypeScript understand.

Contribute

Source code contributions are most welcome, as long as the linter is satisfied.

We are hiring

Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.

License

MIT

About

No description, website, or topics provided.

Resources

Readme
MIT license
Activity
Custom properties

Stars

10 stars

Watchers

9 watching

Forks

2 forks
Report repository

Releases

Packages

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" + '

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
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" + '

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
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); }
})();
})();

Skip to content
BranchesTags
Repository files navigation
aint
A collection of common runtime predicates that TypeScript actually understands.
Build Statusnpm version
Features
  • Simple API;
  • Extensive tests;
  • Isomorphic library, works on the browser or Node.js.
Installation
npm install aint
Requirements
  • Node.js v.14+
Quick start
import{isNotNull}from'aint';// given an array containing null and number valuesconstarray=[1,2,null];// ts infers Array<null | number>// ...remove null values by using isNotNullconstarrayWithoutNull=array.filter(isNotNull);// ts infers Array<number>
API
Motivation
It's easy to perform a check using lodash or vanilla JavaScript, e.g.
constarray=[1,2,null].filter(Boolean);
The example above will filter out the null value as expected (because null is considered to be faulty).
However, TypeScript will NOT infer the correct type [playground link]. It will understand the type of array as being Array<null | number> instead of Array<number>.
aint provides a simple API to test for predicates, while making TypeScript understand.
Contribute
Source code contributions are most welcome, as long as the linter is satisfied.
We are hiring
Causaly is building the world's largest biomedical knowledge platform, using technologies such as TypeScript, React and Node.js. Find out more about our openings at https://apply.workable.com/causaly/.
License
MIT
About
No description, website, or topics provided.
Resources
Readme
MIT license
Activity
Custom properties
Stars
10 stars
Watchers
9 watching
Forks
2 forks
Report repository
Releases
Packages
Used by
Contributors
Languages