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Author: baseballyama

Diff for: src/parser/converts/attr.ts

@@ -34,6 +34,7 @@ import { ParseError } from "../../errors";
 import type { ScriptLetCallback } from "../../context/script-let";
 import type { AttributeToken } from "../html";
 import { svelteVersion } from "../svelte-version";
+import { hasTypeInfo } from "../../utils";
 
 /** Convert for Attributes */
 export function* convertAttributes(
@@ -923,7 +924,7 @@ function buildProcessExpressionForExpression(
 ): (expression: ESTree.Expression) => ScriptLetCallback<ESTree.Expression>[] {
   return (expression) => {
     if (hasTypeInfo(expression)) {
-      return ctx.scriptLet.addExpression(expression, directive);
+      return ctx.scriptLet.addExpression(expression, directive, null);
     }
     return ctx.scriptLet.addExpression(expression, directive, typing);
   };
@@ -944,22 +945,3 @@ function buildExpressionTypeChecker<T extends ESTree.Expression>(
     }
   };
 }
-
-function hasTypeInfo(element: any): boolean {
-  if (element.type?.startsWith("TS")) {
-    return true;
-  }
-  for (const key of Object.keys(element)) {
-    if (key === "parent") continue;
-    const value = element[key];
-    if (value == null) continue;
-    if (typeof value === "object") {
-      if (hasTypeInfo(value)) return true;
-    } else if (Array.isArray(value)) {
-      for (const v of value) {
-        if (typeof v === "object" && hasTypeInfo(v)) return true;
-      }
-    }
-  }
-  return false;
-}

Diff for: src/parser/converts/mustache.ts

@@ -6,6 +6,8 @@ import type {
 } from "../../ast";
 import type { Context } from "../../context";
 import type * as SvAST from "../svelte-ast-types";
+import { hasTypeInfo } from "../../utils";
+
 /** Convert for MustacheTag */
 export function convertMustacheTag(
   node: SvAST.MustacheTag,
@@ -76,8 +78,14 @@ function convertMustacheTag0<T extends SvelteMustacheTag>(
     parent,
     ...ctx.getConvertLocation(node),
   } as T;
-  ctx.scriptLet.addExpression(node.expression, mustache, typing, (es) => {
-    mustache.expression = es;
-  });
+
+  ctx.scriptLet.addExpression(
+    node.expression,
+    mustache,
+    hasTypeInfo(node.expression) ? null : typing,
+    (es) => {
+      mustache.expression = es;
+    },
+  );
   return mustache;
 }

Diff for: src/utils/index.ts

@@ -59,3 +59,22 @@ export function sortedLastIndex<T>(
 
   return upper;
 }
+
+export function hasTypeInfo(element: any): boolean {
+  if (element.type?.startsWith("TS")) {
+    return true;
+  }
+  for (const key of Object.keys(element)) {
+    if (key === "parent") continue;
+    const value = element[key];
+    if (value == null) continue;
+    if (typeof value === "object") {
+      if (hasTypeInfo(value)) return true;
+    } else if (Array.isArray(value)) {
+      for (const v of value) {
+        if (typeof v === "object" && hasTypeInfo(v)) return true;
+      }
+    }
+  }
+  return false;
+}

Diff for: tests/fixtures/parser/ast/svelte5/ts-event08-input.svelte

@@ -0,0 +1,9 @@
+<script lang="ts">
+	let count = $state(0);
+</script>
+
+<button onclick={(event: number) => {
+    count += event;
+}}>
+	clicks: {count}
+</button>