fix: preserve parentheses around {#each} TypeScript as assertions

.changeset/each-as-assertion-parens.md

@@ -0,0 +1,5 @@
+---
+'prettier-plugin-svelte': patch
+---
+
+fix: preserve parentheses around `{#each}` expressions that use `as` type assertions

src/print/index.ts

@@ -502,7 +502,12 @@ export function print(path: AstPath, options: ParserOptions, print: PrintFn): Do
             return group([def, breakParent]);
         }
         case 'EachBlock': {
-            const def: Doc[] = ['{#each ', printJS(path, print, 'expression')];
+            const expression = printJS(path, print, 'expression');
+            const def: Doc[] = [
+                '{#each ',
+                // Wrap TS `as` so it isn't parsed as the `{#each}` context.
+                node.expression.type === 'TSAsExpression' ? ['(', expression, ')'] : expression,
+            ];
 
             if (node.context) {
                 def.push(' as', expandNode(node.context, options.originalText));

test/printer/samples/each-block-type-assertion.html

@@ -0,0 +1,13 @@
+<script lang="ts"></script>
+
+{#each (Object.entries(modes) as [Mode, string][]) as [id, name]}
+    <button>{name}</button>
+{/each}
+
+{#each (items as Item[]) as item}
+    {item}
+{/each}
+
+{#each (["a"] as const) as item}
+    {item}
+{/each}