refactor(validation): remove Node path import, use plain string extraction

Replace `import path from 'path'` with a simple `extractExtension` helper
that does `fileName.slice(fileName.lastIndexOf('.') + 1)`. This removes
the only Node module dependency from validation.ts, making it safe to
import from client components without pulling in a Node polyfill.

Deletes the unnecessary validation-constants.ts that was introduced as
a workaround — the constants now live back in validation.ts where they
belong.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/file-viewer.tsx

@@ -7,7 +7,7 @@ import { Skeleton } from '@/components/emcn'
 import { cn } from '@/lib/core/utils/cn'
 import type { WorkspaceFileRecord } from '@/lib/uploads/contexts/workspace'
 import { getFileExtension } from '@/lib/uploads/utils/file-utils'
-import { SUPPORTED_CODE_EXTENSIONS } from '@/lib/uploads/utils/validation-constants'
+import { SUPPORTED_CODE_EXTENSIONS } from '@/lib/uploads/utils/validation'
 import {
   useUpdateWorkspaceFileContent,
   useWorkspaceFileBinary,

apps/sim/app/workspace/[workspaceId]/files/files.tsx

@@ -36,10 +36,10 @@ import {
   isAudioFileType,
   isVideoFileType,
 } from '@/lib/uploads/utils/file-utils'
-import { SUPPORTED_CODE_EXTENSIONS } from '@/lib/uploads/utils/validation-constants'
 import {
   isSupportedExtension,
   SUPPORTED_AUDIO_EXTENSIONS,
+  SUPPORTED_CODE_EXTENSIONS,
   SUPPORTED_DOCUMENT_EXTENSIONS,
   SUPPORTED_VIDEO_EXTENSIONS,
 } from '@/lib/uploads/utils/validation'

apps/sim/lib/uploads/utils/validation-constants.ts

@@ -1,8 +1,3 @@
-import path from 'path'
-
-export { SUPPORTED_CODE_EXTENSIONS } from '@/lib/uploads/utils/validation-constants'
-export type { SupportedCodeExtension } from '@/lib/uploads/utils/validation-constants'
-
 /**
  * Checks whether a string is a valid file extension (lowercase alphanumeric only).
  * Rejects extensions containing spaces, punctuation, or other non-alphanumeric characters
@@ -12,6 +7,11 @@ export function isAlphanumericExtension(ext: string): boolean {
   return /^[a-z0-9]+$/.test(ext)
 }
 
+function extractExtension(fileName: string): string {
+  const lastDot = fileName.lastIndexOf('.')
+  return lastDot !== -1 ? fileName.slice(lastDot + 1).toLowerCase() : ''
+}
+
 export const MAX_FILE_SIZE = 100 * 1024 * 1024 // 100MB
 
 export const SUPPORTED_DOCUMENT_EXTENSIONS = [
@@ -32,6 +32,54 @@ export const SUPPORTED_DOCUMENT_EXTENSIONS = [
   'yml',
 ] as const
 
+export const SUPPORTED_CODE_EXTENSIONS = [
+  'mdx',
+  'xml',
+  'css',
+  'scss',
+  'less',
+  'js',
+  'jsx',
+  'ts',
+  'tsx',
+  'py',
+  'rb',
+  'go',
+  'rs',
+  'java',
+  'kt',
+  'swift',
+  'c',
+  'cpp',
+  'h',
+  'hpp',
+  'cs',
+  'php',
+  'sh',
+  'bash',
+  'zsh',
+  'fish',
+  'sql',
+  'graphql',
+  'gql',
+  'toml',
+  'ini',
+  'conf',
+  'cfg',
+  'env',
+  'log',
+  'diff',
+  'patch',
+  'dockerfile',
+  'makefile',
+  'gitignore',
+  'editorconfig',
+  'prettierrc',
+  'eslintrc',
+] as const
+
+export type SupportedCodeExtension = (typeof SUPPORTED_CODE_EXTENSIONS)[number]
+
 export const SUPPORTED_AUDIO_EXTENSIONS = [
   'mp3',
   'm4a',
@@ -149,7 +197,7 @@ export interface FileValidationError {
  * Validate if a file type is supported for document processing
  */
 export function validateFileType(fileName: string, mimeType: string): FileValidationError | null {
-  const raw = path.extname(fileName).toLowerCase().substring(1)
+  const raw = extractExtension(fileName)
   const extension = (isAlphanumericExtension(raw) ? raw : '') as SupportedDocumentExtension
 
   if (!SUPPORTED_DOCUMENT_EXTENSIONS.includes(extension)) {
@@ -234,7 +282,7 @@ export function validateMediaFileType(
   fileName: string,
   mimeType: string
 ): FileValidationError | null {
-  const raw = path.extname(fileName).toLowerCase().substring(1)
+  const raw = extractExtension(fileName)
   const extension = isAlphanumericExtension(raw) ? raw : ''
 
   const isAudio = SUPPORTED_AUDIO_EXTENSIONS.includes(extension as SupportedAudioExtension)