fix: transform everything that is not a selector inside `:global` (#14577)

Fixes #14568

.changeset/red-worms-suffer.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: transform everything that is not a selector inside `:global`

packages/svelte/src/compiler/phases/3-transform/css/index.js

@@ -78,7 +78,7 @@ const visitors = {
 		context.state.code.addSourcemapLocation(node.end);
 		context.next();
 	},
-	Atrule(node, { state, next }) {
+	Atrule(node, { state, next, path }) {
 		if (is_keyframes_node(node)) {
 			let start = node.start + node.name.length + 1;
 			while (state.code.original[start] === ' ') start += 1;
@@ -87,7 +87,7 @@ const visitors = {
 
 			if (node.prelude.startsWith('-global-')) {
 				state.code.remove(start, start + 8);
-			} else {
+			} else if (!is_in_global_block(path)) {
 				state.code.prependRight(start, `${state.hash}-`);
 			}
 
@@ -134,7 +134,7 @@ const visitors = {
 			}
 		}
 	},
-	Rule(node, { state, next, visit }) {
+	Rule(node, { state, next, visit, path }) {
 		if (state.minify) {
 			remove_preceding_whitespace(node.start, state);
 			remove_preceding_whitespace(node.block.end - 1, state);
@@ -154,7 +154,7 @@ const visitors = {
 			return;
 		}
 
-		if (!is_used(node)) {
+		if (!is_used(node) && !is_in_global_block(path)) {
 			if (state.minify) {
 				state.code.remove(node.start, node.end);
 			} else {
@@ -182,20 +182,20 @@ const visitors = {
 					state.code.appendLeft(node.block.end, '*/');
 				}
 
-				// don't recurse into selector or body
+				// don't recurse into selectors but visit the body
+				visit(node.block);
 				return;
 			}
-
-			// don't recurse into body
-			visit(node.prelude);
-			return;
 		}
 
 		next();
 	},
 	SelectorList(node, { state, next, path }) {
-		// Only add comments if we're not inside a complex selector that itself is unused
+		// Only add comments if we're not inside a complex selector that itself is unused or a global block
-		if (!path.find((n) => n.type === 'ComplexSelector' && !n.metadata.used)) {
+		if (
+			!is_in_global_block(path) &&
+			!path.find((n) => n.type === 'ComplexSelector' && !n.metadata.used)
+		) {
 			const children = node.children;
 			let pruning = false;
 			let prune_start = children[0].start;
@@ -359,6 +359,14 @@ const visitors = {
 	}
 };
 
+/**
+ *
+ * @param {Array<Css.Node>} path
+ */
+function is_in_global_block(path) {
+	return path.some((node) => node.type === 'Rule' && node.metadata.is_global_block);
+}
+
 /**
  * @param {Css.PseudoClassSelector} selector
  * @param {Css.Combinator | null} combinator

packages/svelte/tests/css/samples/global-block/expected.css

@@ -69,3 +69,20 @@
 			color: red;
 		}
 	}*/
+	/* :global{*/
+		.x{
+			animation: svelte-xyz-test 1s;
+		}
+
+		@keyframes test-in{
+			to{
+				opacity: 1;
+			}
+		}
+	/*}*/
+
+	@keyframes svelte-xyz-test{
+		to{
+			opacity: 1;
+		}
+	}

packages/svelte/tests/css/samples/global-block/input.svelte

@@ -71,4 +71,21 @@
 			color: red;
 		}
 	}
+	:global{
+		.x{
+			animation: test 1s;
+		}
+
+		@keyframes test-in{
+			to{
+				opacity: 1;
+			}
+		}
+	}
+
+	@keyframes test{
+		to{
+			opacity: 1;
+		}
+	}
 </style>