fix(file): preserve validation for malformed content

Author: mzxchandra

apps/sim/blocks/blocks/file.ts

@@ -1964,8 +1964,8 @@ export const FileV5Block: BlockConfig<FileParserV3Output> = {
            * Explicitly clear unused Content because the executor merges these params
            * over the original inputs. Preserve empty text when no file is selected.
            */
-          const contentText = typeof params.content === 'string' ? params.content : undefined
-          const omitContent = Boolean(fileInput) && !contentText
+          const omitContent =
+            Boolean(fileInput) && (params.content == null || params.content === '')
           return {
             fileName: params.fileName,
             folderPath: optionalText(params.writeFolderRef),

apps/sim/executor/handlers/generic/file-write.test.ts

@@ -69,6 +69,21 @@ describe('File Write executor inputs', () => {
     ])
   })
 
+  it.each([0, false, { text: 'invalid' }, ['invalid']])(
+    'rejects non-string Content %j alongside a file',
+    async (content) => {
+      const result = await executeWrite({ content, writeFileInput: generatedFile })
+
+      expect(result.success).toBe(false)
+      if (result.success) throw new Error('Expected malformed Content to fail validation')
+      expect(result.error.issues).toEqual(
+        expect.arrayContaining([
+          expect.objectContaining({ path: ['content'], code: 'invalid_type' }),
+        ])
+      )
+    }
+  )
+
   it.each(['', 'text'])('preserves text-only Content %j', async (content) => {
     const result = await executeWrite({ content })