Remove the special casing of "external" links pointing at file: (via …

…stopProcessing)

This is now handled in assetgraph by having asset.load({metadataOnly: true})
issue an fs.stat call.

#143 (comment)

lib/index.js

@@ -309,12 +309,6 @@ async function hyperlink(
         }
       }
 
-      // In non-recursive mode local assets might be marked as end-of-line.
-      // This is specifically relevant to local file-URLs
-      if (asset.stopProcessing) {
-        return;
-      }
-
       // Save info for the redirect check later
       if (asset.statusCode >= 300 && asset.statusCode < 400) {
         const redirectRelation = asset.outgoingRelations.find(
@@ -416,17 +410,7 @@ async function hyperlink(
           if (!relation.crossorigin && recursive) {
             follow = true;
           } else if (relation.from !== relation.to) {
-            // If we are handling local file-urls, follow but mark as end-of-line in processing
-            if (
-              !recursive &&
-              relation.from.protocol === 'file:' &&
-              relation.to.protocol === 'file:'
-            ) {
-              follow = true;
-              relation.to.stopProcessing = true;
-            } else {
-              metadataOnly = true;
-            }
+            metadataOnly = true;
           }
         } else if (
           /^(?:JavaScript|Css)Source(?:Mapping)Url$/.test(relation.type)
@@ -448,16 +432,7 @@ async function hyperlink(
 
         if (follow || metadataOnly) {
           if (assetTypesWithoutRelations.includes(relation.to.type)) {
-            // If we are handling local file-urls, follow but mark as end-of-line in processing
-            if (
-              relation.from.protocol === 'file:' &&
-              relation.to.protocol === 'file:'
-            ) {
-              relation.to.stopProcessing = !recursive;
-              assetQueue.push(relation.to);
-            } else {
-              metadataOnly = true;
-            }
+            metadataOnly = true;
           } else {
             assetQueue.push(relation.to);
           }