Move fileExistsSync to utils

src/utils.ts

@@ -1,4 +1,5 @@
 import * as core from '@actions/core'
+import * as fs from 'fs'
 import * as path from 'path'
 
 export function getInputAsArray(
@@ -111,3 +112,28 @@ export function parseDisplayNameEmail(
     email: email
   }
 }
+
+export function fileExistsSync(path: string): boolean {
+  if (!path) {
+    throw new Error("Arg 'path' must not be empty")
+  }
+
+  let stats: fs.Stats
+  try {
+    stats = fs.statSync(path)
+  } catch (error) {
+    if (error.code === 'ENOENT') {
+      return false
+    }
+
+    throw new Error(
+      `Encountered an error when checking whether path '${path}' exists: ${error.message}`
+    )
+  }
+
+  if (!stats.isDirectory()) {
+    return true
+  }
+
+  return false
+}