v0.2

README.md

@@ -4,14 +4,15 @@
 
 **WindCtrl** is a next-generation styling utility that unifies static Tailwind classes and dynamic inline styles into a single, type-safe interface.
 
-It evolves the concept of Variant APIs (like [cva](https://cva.style/)) by introducing **Stackable Traits** to solve combinatorial explosion and **Interpolated Variants** for seamless dynamic value handling—all while maintaining a minimal runtime footprint optimized for Tailwind's JIT compiler.
+It builds on existing variant APIs (like [cva](https://cva.style/)) and introduces **Stackable Traits** to avoid combinatorial explosion, as well as **Interpolated Variants** for seamless dynamic styling.
+All of this is achieved with a minimal runtime footprint and full compatibility with Tailwind's JIT compiler.
 
 ## Features
 
-- 🎨 **Unified API** - Seamlessly blends static Tailwind classes and dynamic inline styles into one cohesive interface.
 - 🧩 **Trait System** - Solves combinatorial explosion by treating states as stackable, non-exclusive layers.
-- 🎯 **Scoped Styling** - Context-aware styling using data attributes - no React Context required (RSC friendly).
+- 🎨 **Unified API** - Seamlessly blends static Tailwind classes and dynamic inline styles into one cohesive interface.
 - ⚡ **JIT Conscious** - Designed for Tailwind JIT: utilities stay as class strings, while truly dynamic values can be expressed as inline styles.
+- 🎯 **Scoped Styling** - Context-aware styling using data attributes - no React Context required (RSC friendly).
 - 🔒 **Type-Safe** - Best-in-class TypeScript support with automatic prop inference.
 - 📦 **Minimal Overhead** - Ultra-lightweight runtime with only `clsx` and `tailwind-merge` as dependencies.
 
@@ -24,7 +25,7 @@ npm install windctrl
 ## Quick Start
 
 ```typescript
-import { windctrl } from "windctrl";
+import { windctrl, dynamic as d } from "windctrl";
 
 const button = windctrl({
   base: "rounded px-4 py-2 font-medium transition duration-200",
@@ -44,8 +45,7 @@ const button = windctrl({
     glass: "backdrop-blur-md bg-white/10 border border-white/20 shadow-xl",
   },
   dynamic: {
-    w: (val) =>
-      typeof val === "number" ? { style: { width: `${val}px` } } : val,
+    w: d.px("width"),
   },
   defaultVariants: {
     intent: "primary",
@@ -70,34 +70,33 @@ button({ w: "w-full" });
 
 ## Core Concepts
 
-### Interpolated Variants (Dynamic Props)
-
-Interpolated variants provide a **Unified API** that bridges static Tailwind classes and dynamic inline styles. A dynamic resolver can return either:
-
-- a **Tailwind class string** (static utility), or
-- an object containing **className and/or style** (inline styles and optional utilities)
+### Variants
 
-This is **JIT-friendly by design**, as long as the class strings you return are statically enumerable (i.e. appear in your source code).
-For truly unbounded values (e.g. pixel sizes), prefer returning style to avoid relying on arbitrary-value class generation.
+Variants represent mutually exclusive design choices (e.g., `primary` vs `secondary`). They serve as the foundation of your component's design system.
 
 ```typescript
 const button = windctrl({
-  dynamic: {
-    // Recommended pattern:
-    // - Numbers -> inline styles (unbounded values)
-    // - Strings -> Tailwind utilities (must be statically enumerable for JIT)
-    w: (val) =>
-      typeof val === "number" ? { style: { width: `${val}px` } } : val,
+  variants: {
+    intent: {
+      primary: "bg-blue-500 text-white hover:bg-blue-600",
+      secondary: "bg-gray-100 text-gray-900 hover:bg-gray-200",
+    },
+    size: {
+      sm: "text-sm h-8 px-3",
+      md: "text-base h-10 px-4",
+      lg: "text-lg h-12 px-6",
+    },
+  },
+  defaultVariants: {
+    intent: "primary",
+    size: "md",
   },
 });
 
 // Usage
-button({ w: "w-full" }); // -> className includes "w-full" (static utility)
-button({ w: 200 }); // -> style includes { width: "200px" } (dynamic value)
+button({ intent: "primary", size: "lg" });
 ```
 
-> **Note on Tailwind JIT**: Tailwind only generates CSS for class names it can statically detect in your source. Avoid constructing class strings dynamically (e.g. "`w-`" + `size`) unless you safelist them in your Tailwind config.
-
 ### Traits (Stackable States)
 
 Traits are non-exclusive, stackable layers of state. Unlike `variants` (which are mutually exclusive), multiple traits can be active simultaneously. This declarative approach solves the "combinatorial explosion" problem often seen with `compoundVariants`.
@@ -123,55 +122,141 @@ button({ traits: ["loading", "glass"] });
 button({ traits: { loading: isLoading, glass: true } });
 ```
 
-### Scopes (RSC Support)
+### Slots (Compound Components)
 
-Scopes enable **context-aware styling** without relying on React Context or client-side JavaScript. This makes them fully compatible with React Server Components (RSC). They utilize Tailwind's group modifier logic under the hood.
+Slots allow you to define styles for **sub-elements** (e.g., icon, label) within a single component definition. Each slot returns its own class string, enabling clean compound component patterns.
+
+Slots are completely optional and additive. You can start with a single-root component and introduce slots only when needed.
+If a slot is never defined, it simply won't appear in the result.
 
 ```typescript
 const button = windctrl({
-  scopes: {
-    header: "text-sm py-1",
-    footer: "text-xs text-gray-500",
+  base: {
+    root: "inline-flex items-center gap-2 rounded px-4 py-2",
+    slots: {
+      icon: "shrink-0",
+      label: "truncate",
+    },
+  },
+  variants: {
+    size: {
+      sm: {
+        root: "h-8 text-sm",
+        slots: { icon: "h-3 w-3" },
+      },
+      md: {
+        root: "h-10 text-base",
+        slots: { icon: "h-4 w-4" },
+      },
+    },
+  },
+  traits: {
+    loading: {
+      root: "opacity-70 pointer-events-none",
+      slots: { icon: "animate-spin" },
+    },
   },
+  defaultVariants: { size: "md" },
 });
 
 // Usage
-// 1. Wrap the parent with `data-windctrl-scope` and `group/windctrl-scope`
-// 2. The button automatically adapts its style based on the parent
-<div data-windctrl-scope="header" className="group/windctrl-scope">
-  <button className={button().className}>Header Button</button>
-</div>
+const { className, slots } = button({ size: "sm", traits: ["loading"] });
+
+// Apply to elements
+<button className={className}>
+  <Icon className={slots?.icon} />
+  <span className={slots?.label}>Click me</span>
+</button>
 ```
 
-The scope classes are automatically prefixed with `group-data-[windctrl-scope=...]/windctrl-scope:` to target the parent's data attribute.
+Slots follow the same priority rules as root classes: **Base < Variants < Traits**, with `tailwind-merge` handling conflicts.
 
-### Variants
+Unlike slot-based APIs that require declaring all slots upfront, WindCtrl allows slots to emerge naturally from variants and traits.
 
-Variants represent mutually exclusive design choices (e.g., `primary` vs `secondary`). They serve as the foundation of your component's design system.
+### Interpolated Variants (Dynamic Props)
+
+Interpolated variants provide a **Unified API** that bridges static Tailwind classes and dynamic inline styles. A dynamic resolver can return either:
+
+- a **Tailwind class string** (static utility), or
+- an object containing **className and/or style** (inline styles and optional utilities)
+
+This is **JIT-friendly by design**, as long as the class strings you return are statically enumerable (i.e. appear in your source code).
+For truly unbounded values (e.g. pixel sizes), prefer returning style to avoid relying on arbitrary-value class generation.
+
+#### Dynamic Presets
+
+WindCtrl provides built-in presets for common dynamic patterns:
+
+```typescript
+import { windctrl, dynamic as d } from "windctrl";
+
+const box = windctrl({
+  dynamic: {
+    // d.px() - pixel values (width, height, top, left, etc.)
+    w: d.px("width"),
+    h: d.px("height"),
+
+    // d.num() - unitless numbers (zIndex, flexGrow, order, etc.)
+    z: d.num("zIndex"),
+
+    // d.opacity() - opacity values
+    fade: d.opacity(),
+
+    // d.var() - CSS custom properties
+    x: d.var("--translate-x", { unit: "px" }),
+  },
+});
+
+// Usage
+box({ w: 200 }); // -> style: { width: "200px" }
+box({ w: "w-full" }); // -> className: "w-full"
+box({ z: 50 }); // -> style: { zIndex: 50 }
+box({ fade: 0.5 }); // -> style: { opacity: 0.5 }
+box({ x: 10 }); // -> style: { "--translate-x": "10px" }
+```
+
+#### Custom Resolvers
+
+You can also write custom resolvers for more complex logic:
 
 ```typescript
 const button = windctrl({
-  variants: {
-    intent: {
-      primary: "bg-blue-500 text-white hover:bg-blue-600",
-      secondary: "bg-gray-100 text-gray-900 hover:bg-gray-200",
-    },
-    size: {
-      sm: "text-sm h-8 px-3",
-      md: "text-base h-10 px-4",
-      lg: "text-lg h-12 px-6",
-    },
+  dynamic: {
+    // Custom resolver example
+    w: (val) =>
+      typeof val === "number" ? { style: { width: `${val}px` } } : val,
   },
-  defaultVariants: {
-    intent: "primary",
-    size: "md",
+});
+
+// Usage
+button({ w: "w-full" }); // -> className includes "w-full" (static utility)
+button({ w: 200 }); // -> style includes { width: "200px" } (dynamic value)
+```
+
+> **Note on Tailwind JIT**: Tailwind only generates CSS for class names it can statically detect in your source. Avoid constructing class strings dynamically (e.g. "`w-`" + `size`) unless you safelist them in your Tailwind config.
+
+### Scopes (RSC Support)
+
+Scopes enable **context-aware styling** without relying on React Context or client-side JavaScript. This makes them fully compatible with React Server Components (RSC). They utilize Tailwind's group modifier logic under the hood.
+
+```typescript
+const button = windctrl({
+  scopes: {
+    header: "text-sm py-1",
+    footer: "text-xs text-gray-500",
   },
 });
 
 // Usage
-button({ intent: "primary", size: "lg" });
+// 1. Wrap the parent with `data-windctrl-scope` and `group/windctrl-scope`
+// 2. The button automatically adapts its style based on the parent
+<div data-windctrl-scope="header" className="group/windctrl-scope">
+  <button className={button().className}>Header Button</button>
+</div>
 ```
 
+The scope classes are automatically prefixed with `group-data-[windctrl-scope=...]/windctrl-scope:` to target the parent's data attribute.
+
 ## Gotchas
 
 - **Tailwind JIT:** Tailwind only generates CSS for class names it can statically detect. Avoid constructing class strings dynamically unless you safelist them.

examples/Button.tsx

@@ -1,5 +1,5 @@
 import React from "react";
-import { windctrl } from "../src/index";
+import { windctrl, dynamic as d } from "../src/index";
 import type { ComponentPropsWithoutRef, ElementType } from "react";
 
 const button = windctrl({
@@ -24,10 +24,8 @@ const button = windctrl({
     disabled: "pointer-events-none opacity-50",
   },
   dynamic: {
-    w: (val) =>
-      typeof val === "number" ? { style: { width: `${val}px` } } : `w-${val}`,
-    h: (val) =>
-      typeof val === "number" ? { style: { height: `${val}px` } } : `h-${val}`,
+    w: d.px("width"),
+    h: d.px("height"),
   },
   defaultVariants: {
     intent: "primary",