Validate body

packages/builder/src/components/common/CodeEditor/CodeEditor.svelte

@@ -296,9 +296,19 @@
               return
             }
 
-            const { arguments: expectedArguments = [] } =
+            const { arguments: expectedArguments = [], requiresBlock } =
               validations[helperName]
 
+            if (requiresBlock && !isBlockStatement(node)) {
+              diagnostics.push({
+                from,
+                to,
+                severity: "error",
+                message: `Helper "${helperName}" requires a body.`,
+              })
+              return
+            }
+
             const providedParams = node.params
 
             if (providedParams.length !== expectedArguments.length) {

packages/builder/src/components/common/CodeEditor/index.ts

@@ -84,6 +84,7 @@ const helpersToCompletion = (
     return {
       label: helperName,
       args: helper.args,
+      requiresBlock: helper.requiresBlock,
       info: () => buildHelperInfoNode(helper),
       type: "helper",
       section: helperSection,

packages/builder/src/components/common/bindings/BindingPanel.svelte

@@ -113,6 +113,7 @@
     ...helperOptions.reduce<CodeValidator>((validations, option) => {
       validations[option.label] = {
         arguments: option.args,
+        requiresBlock: option.requiresBlock,
       }
       return validations
     }, {}),

packages/builder/src/types/bindings.ts

@@ -7,11 +7,13 @@ export type BindingCompletion = (context: CompletionContext) => {
 
 export interface BindingCompletionOption extends Completion {
   args?: any[]
+  requiresBlock?: boolean
 }
 
 export type CodeValidator = Record<
   string,
   {
     arguments?: any[]
+    requiresBlock?: boolean
   }
 >

packages/types/src/ui/bindings/helper.ts

@@ -2,4 +2,5 @@ export interface Helper {
   example: string
   description: string
   args: any[]
+  requiresBlock?: boolean
 }