Logg all duplicate snippets

docs/docusaurus/scripts/remark-named-snippets/snippet.js

@@ -10,18 +10,24 @@ const htmlparser2 = require('htmlparser2')
  */
 function constructSnippetMap(dirs) {
   const snippets = parseSourceDirectories(dirs)
+  const duplicateNames = []
 
   const snippetMap = {}
   for (const snippet of snippets) {
     const name = snippet.name
     if (name in snippetMap) {
-      throw new Error(
-        `A snippet named ${name} has already been defined elsewhere`
-      )
+      duplicateNames.push(name)
     }
     delete snippet.name // Remove duplicate filename to clean up stdout
     snippetMap[name] = snippet
   }
+  if (duplicateNames.length > 0) {
+    console.error("Duplicate snippet names found:")
+    console.error(duplicateNames.map((name) => `  ${name}`).join('\n'))
+    throw new Error(
+      `${duplicateNames.length} duplicate snippet names found`
+    )
+  }
 
   return snippetMap
 }