Refactor some screen compatibility code (#14465)

These changes were extracted from our work on a `screen()` function for
CSS — we've decided to move those changes to a code mod instead of
implementing support for `screen()` in the compiler — but the
refactoring around the changes still makes sense to do so I'm landing
that here separately.

---------

Co-authored-by: Philipp Spiess <hello@philippspiess.com>

packages/tailwindcss/src/compat/config/resolve-config.ts

@@ -203,4 +203,19 @@ function mergeTheme(ctx: ResolutionContext) {
   for (let key in ctx.theme) {
     ctx.theme[key] = resolveValue(ctx.theme[key])
   }
+
+  // Turn {min: '123px'} into '123px' in screens
+  if (ctx.theme.screens && typeof ctx.theme.screens === 'object') {
+    for (let key of Object.keys(ctx.theme.screens)) {
+      let screen = ctx.theme.screens[key]
+      if (!screen) continue
+      if (typeof screen !== 'object') continue
+
+      if ('raw' in screen) continue
+      if ('max' in screen) continue
+      if (!('min' in screen)) continue
+
+      ctx.theme.screens[key] = screen.min
+    }
+  }
 }

packages/tailwindcss/src/compat/screens-config.test.ts

@@ -457,7 +457,7 @@ describe('complex screen configs', () => {
               md: [
                 //
                 { min: '668px', max: '767px' },
-                { min: '868px' },
+                '868px',
               ],
               lg: { min: '868px' },
               xl: { min: '1024px', max: '1279px' },
@@ -468,15 +468,14 @@ describe('complex screen configs', () => {
       }),
     })
 
-    expect(
-      compiler.build(['min-sm:flex', 'min-md:flex', 'min-lg:flex', 'min-xl:flex', 'min-tall:flex']),
-    ).toBe('')
+    expect(compiler.build(['min-sm:flex', 'min-md:flex', 'min-xl:flex', 'min-tall:flex'])).toBe('')
 
     expect(
       compiler.build([
         'sm:flex',
         'md:flex',
         'lg:flex',
+        'min-lg:flex',
         'xl:flex',
         'tall:flex',
 
@@ -485,22 +484,27 @@ describe('complex screen configs', () => {
       ]),
     ).toMatchInlineSnapshot(`
       ".lg\\:flex {
-        @media (min-width: 868px) {
+        @media (width >= 868px) {
+          display: flex;
+        }
+      }
+      .min-lg\\:flex {
+        @media (width >= 868px) {
           display: flex;
         }
       }
       .sm\\:flex {
-        @media (max-width: 639px) {
+        @media (639px >= width) {
           display: flex;
         }
       }
       .md\\:flex {
-        @media (min-width: 668px and max-width: 767px), (min-width: 868px) {
+        @media (767px >= width >= 668px), (width >= 868px) {
           display: flex;
         }
       }
       .xl\\:flex {
-        @media (min-width: 1024px and max-width: 1279px) {
+        @media (1279px >= width >= 1024px) {
           display: flex;
         }
       }

packages/tailwindcss/src/compat/screens-config.ts

@@ -31,24 +31,14 @@ export function registerScreensConfig(userConfig: ResolvedConfig, designSystem:
       continue
     }
 
-    let query: string | undefined
     let deferInsert = true
+
     if (typeof value === 'string') {
-      query = `(width >= ${value})`
       deferInsert = false
-    } else if (typeof value === 'object' && value !== null) {
-      if (Array.isArray(value)) {
-        query = value.map(ruleForComplexScreenValue).join(', ')
-      } else {
-        query = ruleForComplexScreenValue(value) ?? ''
-        if ('min' in value && !('max' in value)) {
-          deferInsert = false
-        }
-      }
-    } else {
-      continue
     }
 
+    let query = buildMediaQuery(value)
+
     function insert(order: number) {
       // `min-*` and `max-*` rules do not need to be reconfigured, as they are
       // reading the latest values from the theme.
@@ -87,19 +77,47 @@ export function registerScreensConfig(userConfig: ResolvedConfig, designSystem:
   }
 }
 
-function ruleForComplexScreenValue(value: object): string | null {
-  let query = null
-  if ('raw' in value && typeof value.raw === 'string') {
-    query = value.raw
-  } else {
-    let rules: string[] = []
+export function buildMediaQuery(values: unknown) {
+  type ScreenDescriptor = {
+    min?: string
+    max?: string
+    raw?: string
+  }
 
-    if ('min' in value) rules.push(`min-width: ${value.min}`)
-    if ('max' in value) rules.push(`max-width: ${value.max}`)
+  let list: unknown[] = Array.isArray(values) ? values : [values]
+  return list
+    .map((value): ScreenDescriptor | null => {
+      if (typeof value === 'string') {
+        return { min: value }
+      }
 
-    if (rules.length !== 0) {
-      query = `(${rules.join(' and ')})`
-    }
-  }
-  return query
+      if (value && typeof value === 'object') {
+        return value
+      }
+
+      return null
+    })
+    .map((screen) => {
+      if (screen === null) return null
+
+      if ('raw' in screen) {
+        return screen.raw
+      }
+
+      let query = ''
+
+      if (screen.max !== undefined) {
+        query += `${screen.max} >= `
+      }
+
+      query += 'width'
+
+      if (screen.min !== undefined) {
+        query += ` >= ${screen.min}`
+      }
+
+      return `(${query})`
+    })
+    .filter(Boolean)
+    .join(', ')
 }

packages/tailwindcss/src/css-functions.ts

@@ -19,9 +19,13 @@ export function substituteFunctions(ast: AstNode[], resolveThemeValue: ResolveTh
       if (
         node.selector[0] === '@' &&
         (node.selector.startsWith('@media ') ||
+          node.selector.startsWith('@media(') ||
           node.selector.startsWith('@custom-media ') ||
+          node.selector.startsWith('@custom-media(') ||
           node.selector.startsWith('@container ') ||
-          node.selector.startsWith('@supports ')) &&
+          node.selector.startsWith('@container(') ||
+          node.selector.startsWith('@supports ') ||
+          node.selector.startsWith('@supports(')) &&
         node.selector.includes(THEME_FUNCTION_INVOCATION)
       ) {
         node.selector = substituteFunctionsInValue(node.selector, resolveThemeValue)