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Cache

A small, opinionated Swift cache for predictable, testable, pull-based caching.

Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.

Documentation

Why this exists

In production iOS apps, caching sits on the critical path between data correctness and user trust.

Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.

This library is a deliberate response to that trade-off.

It is designed around a small set of constraints:

  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail

You ask for a resource.
You either get it — or you don’t.

What it is

  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:
    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection

What it deliberately avoids

  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs

If something is missing or expired, the cache tells you clearly.

Example

structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")

About

A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage.

Topics

cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable

Resources

Readme
MIT license
Activity

Stars

3 stars

Watchers

1 watching

Forks

1 fork
Report repository

Releases

Packages

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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
Resources
Readme
MIT license
Activity
Stars
3 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
Resources
Readme
MIT license
Activity
Stars
3 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
Resources
Readme
MIT license
Activity
Stars
3 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
Resources
Readme
MIT license
Activity
Stars
3 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
Resources
Readme
MIT license
Activity
Stars
3 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
Resources
Readme
MIT license
Activity
Stars
3 stars
Watchers
1 watching
Forks
1 fork
Report repository
Releases
Packages
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
Cache
A small, opinionated Swift cache for predictable, testable, pull-based caching.
Designed for production iOS apps where correctness, determinism, and clarity matter more than clever eviction strategies.
Documentation
Why this exists
In production iOS apps, caching sits on the critical path between data correctness and user trust.
Over time, I noticed that many caching approaches optimise for convenience or automation at the expense of clarity: background refreshes, implicit invalidation, and time-based heuristics that make behaviour hard to predict or test.
This library is a deliberate response to that trade-off.
It is designed around a small set of constraints:
  • Caching should be explicit
  • Expiry should be modelled, not inferred
  • Behaviour should be deterministic and testable
  • Storage should remain an implementation detail
You ask for a resource.

You either get it — or you don’t.
What it is
  • A generic cache for any Identifiable & Sendable type
  • Two interchangeable backends:

    • VolatileCache — fast, in-memory
    • FileSystemCache — persistent, file-backed
  • First-class expiry with injected time
  • Native async/await
  • Designed to compose cleanly with dependency injection
What it deliberately avoids
  • Background refresh loops
  • Global singletons
  • Heuristic eviction
  • Non-deterministic behaviour
  • “Helpful” fallbacks that hide bugs
If something is missing or expired, the cache tells you clearly.
Example
structCheese:Identifiable,Sendable{letid:Stringletname:String}letcache=VolatileCache<Cheese>()tryawait cache.stash(Cheese(id:"123", name:"Brie"),
duration:.short
)letcheese=tryawait cache.resource(for:"123")
About
A lightweight Swift library for caching Identifiable values with optional expiry, supporting both in-memory and file-backed storage. 
Topics
cachecachingcodabledependency-injectiondisk-cacheexpiryfile-systemin-memory-cacheswiftswift-concurrencyswift-dependenciesswift-packagetestable
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