feat: Add max-width container query support

- Allow configuration of max-width container queries using object syntax
- Support both string values (min-width) and object values with max/min properties
- Sort max-width queries in descending order
- Maintain backward compatibility with original string-based configuration
- Add proper TypeScript type definitions

src/index.ts

@@ -1,8 +1,33 @@
 import plugin from 'tailwindcss/plugin'
 
+type ContainerValue = string | { min?: string; max?: string }
+type QueryType = 'min-width' | 'max-width'
+
 export = plugin(
   function containerQueries({ matchUtilities, matchVariant, theme }) {
-    let values: Record<string, string> = theme('containers') ?? {}
+    let values: Record<string, ContainerValue> = theme('containers') ?? {}
+
+    // Process the container values to support both string and object formats
+    let processedValues: Record<string, string> = {}
+    let queryTypes: Record<string, QueryType> = {}
+
+    // Transform the theme values into a format we can use
+    for (const [key, value] of Object.entries(values)) {
+      if (typeof value === 'string') {
+        // String value - use as min-width (original behavior)
+        processedValues[key] = value
+        queryTypes[key] = 'min-width'
+      } else if (typeof value === 'object' && value !== null) {
+        // Object with min/max properties
+        if (value.min) {
+          processedValues[key] = value.min
+          queryTypes[key] = 'min-width'
+        } else if (value.max) {
+          processedValues[key] = value.max
+          queryTypes[key] = 'max-width'
+        }
+      }
+    }
 
     function parseValue(value: string) {
       let numericValue = value.match(/^(\d+\.\d+|\d+|\.\d+)\D+/)?.[1] ?? null
@@ -34,18 +59,39 @@ export = plugin(
       (value = '', { modifier }) => {
         let parsed = parseValue(value)
 
-        return parsed !== null ? `@container ${modifier ?? ''} (min-width: ${value})` : []
+        // Find the key for this value to determine query type
+        const key = Object.keys(processedValues).find(k => processedValues[k] === value)
+        const queryType = key ? queryTypes[key] : 'min-width'
+
+        return parsed !== null ? `@container ${modifier ?? ''} (${queryType}: ${value})` : []
       },
       {
-        values,
+        values: processedValues,
         sort(aVariant, zVariant) {
           let a = parseFloat(aVariant.value)
           let z = parseFloat(zVariant.value)
 
           if (a === null || z === null) return 0
 
-          // Sort values themselves regardless of unit
-          if (a - z !== 0) return a - z
+          // Find keys to determine query types
+          const aKey = Object.keys(processedValues).find(k => processedValues[k] === aVariant.value)
+          const zKey = Object.keys(processedValues).find(k => processedValues[k] === zVariant.value)
+
+          const aType = aKey ? queryTypes[aKey] : 'min-width'
+          const zType = zKey ? queryTypes[zKey] : 'min-width'
+
+          // If they have different types, sort max-width first
+          if (aType !== zType) {
+            return aType === 'max-width' ? -1 : 1
+          }
+
+          // For max-width queries, we want descending order
+          if (aType === 'max-width') {
+            if (a - z !== 0) return z - a
+          } else {
+            // Original sort logic for min-width
+            if (a - z !== 0) return a - z
+          }
 
           let aLabel = aVariant.modifier ?? ''
           let zLabel = zVariant.modifier ?? ''