make interface simpler

apps/sim/blocks/blocks/google_slides.ts

@@ -962,16 +962,10 @@ export const GoogleSlidesV2Block: BlockConfig<GoogleSlidesResponse> = {
 
         if (params.operation === 'add_image') {
           const imageInput = params.imageFile || params.imageFileReference || params.imageSource
-          const normalizedFiles = normalizeFileInput(imageInput)
-          if (!normalizedFiles || normalizedFiles.length === 0) {
+          const fileObject = normalizeFileInput(imageInput, { single: true })
+          if (!fileObject) {
             throw new Error('Image file is required.')
           }
-          if (normalizedFiles.length > 1) {
-            throw new Error(
-              'File reference must be a single file, not an array. Use <block.files[0]> to select one file.'
-            )
-          }
-          const fileObject = normalizedFiles[0]
           const imageUrl = resolveHttpsUrlFromFileInput(fileObject)
           if (!imageUrl) {
             throw new Error('Image file must include a https URL.')

apps/sim/blocks/blocks/linear.ts

@@ -1775,17 +1775,15 @@ Return ONLY the date string in YYYY-MM-DD format - no explanations, no quotes, n
               throw new Error('Issue ID is required.')
             }
             // Normalize file inputs - handles JSON stringified values from advanced mode
-            // Take the first file from whichever input has data (Linear only accepts single file)
             const attachmentFile =
-              normalizeFileInput(params.attachmentFileUpload, { single: true }) ||
-              normalizeFileInput(params.file, { single: true })
-            // Check for multiple files
-            if (
-              (normalizedUpload && normalizedUpload.length > 1) ||
-              (normalizedFile && normalizedFile.length > 1)
-            ) {
-              throw new Error('Attachment file must be a single file.')
-            }
+              normalizeFileInput(params.attachmentFileUpload, {
+                single: true,
+                errorMessage: 'Attachment file must be a single file.',
+              }) ||
+              normalizeFileInput(params.file, {
+                single: true,
+                errorMessage: 'Attachment file must be a single file.',
+              })
             const attachmentUrl =
               params.url?.trim() ||
               (attachmentFile ? (attachmentFile as { url?: string }).url : undefined)

apps/sim/blocks/blocks/mistral_parse.ts

@@ -214,17 +214,13 @@ export const MistralParseV2Block: BlockConfig<MistralParserOutput> = {
         }
 
         const documentInput = normalizeFileInput(
-          params.fileUpload || params.fileReference || params.document
+          params.fileUpload || params.fileReference || params.document,
+          { single: true }
         )
-        if (!documentInput || documentInput.length === 0) {
+        if (!documentInput) {
           throw new Error('PDF document is required')
         }
-        if (documentInput.length > 1) {
-          throw new Error(
-            'File reference must be a single file, not an array. Use <block.attachments[0]> to select one file.'
-          )
-        }
-        parameters.file = documentInput[0]
+        parameters.file = documentInput
 
         let pagesArray: number[] | undefined
         if (params.pages && params.pages.trim() !== '') {

apps/sim/blocks/blocks/pulse.ts

@@ -183,18 +183,14 @@ export const PulseV2Block: BlockConfig<PulseParserOutput> = {
           apiKey: params.apiKey.trim(),
         }
 
-        const normalizedFiles = normalizeFileInput(
-          params.fileUpload || params.fileReference || params.document
+        const normalizedFile = normalizeFileInput(
+          params.fileUpload || params.fileReference || params.document,
+          { single: true }
         )
-        if (!normalizedFiles || normalizedFiles.length === 0) {
+        if (!normalizedFile) {
           throw new Error('Document file is required')
         }
-        if (normalizedFiles.length > 1) {
-          throw new Error(
-            'File reference must be a single file, not an array. Use <block.attachments[0]> to select one file.'
-          )
-        }
-        parameters.file = normalizedFiles[0]
+        parameters.file = normalizedFile
 
         if (params.pages && params.pages.trim() !== '') {
           parameters.pages = params.pages.trim()

apps/sim/blocks/blocks/reducto.ts

@@ -188,17 +188,13 @@ export const ReductoV2Block: BlockConfig<ReductoParserOutput> = {
         }
 
         const documentInput = normalizeFileInput(
-          params.fileUpload || params.fileReference || params.document
+          params.fileUpload || params.fileReference || params.document,
+          { single: true }
         )
-        if (!documentInput || documentInput.length === 0) {
+        if (!documentInput) {
           throw new Error('PDF document file is required')
         }
-        if (documentInput.length > 1) {
-          throw new Error(
-            'File reference must be a single file, not an array. Use <block.attachments[0]> to select one file.'
-          )
-        }
-        parameters.file = documentInput[0]
+        parameters.file = documentInput
 
         let pagesArray: number[] | undefined
         if (params.pages && params.pages.trim() !== '') {

apps/sim/blocks/utils.ts

@@ -250,6 +250,9 @@ export function createVersionedToolSelector<TParams extends Record<string, any>>
   }
 }
 
+const DEFAULT_MULTIPLE_FILES_ERROR =
+  'File reference must be a single file, not an array. Use <block.files[0]> to select one file.'
+
 /**
  * Normalizes file input from block params to a consistent format.
  * Handles the case where template resolution JSON.stringify's arrays/objects
@@ -260,12 +263,13 @@ export function createVersionedToolSelector<TParams extends Record<string, any>>
  *   - An array of file objects (basic mode or properly resolved)
  *   - A single file object
  *   - A JSON string of file(s) (from advanced mode template resolution)
- * @param options.single - If true, returns only the first file object instead of an array
+ * @param options.single - If true, returns single file object and throws if multiple provided
+ * @param options.errorMessage - Custom error message when single is true and multiple files provided
  * @returns Normalized file(s), or undefined if no files
  */
 export function normalizeFileInput(
   fileParam: unknown,
-  options: { single: true }
+  options: { single: true; errorMessage?: string }
 ): object | undefined
 export function normalizeFileInput(
   fileParam: unknown,
@@ -273,7 +277,7 @@ export function normalizeFileInput(
 ): object[] | undefined
 export function normalizeFileInput(
   fileParam: unknown,
-  options?: { single?: boolean }
+  options?: { single?: boolean; errorMessage?: string }
 ): object | object[] | undefined {
   if (!fileParam) return undefined
 
@@ -295,5 +299,12 @@ export function normalizeFileInput(
 
   if (!files) return undefined
 
-  return options?.single ? files[0] : files
+  if (options?.single) {
+    if (files.length > 1) {
+      throw new Error(options.errorMessage ?? DEFAULT_MULTIPLE_FILES_ERROR)
+    }
+    return files[0]
+  }
+
+  return files
 }