add isExternalURL

apps/remix-ide/src/app/compiler/compiler-imports.js

@@ -14,7 +14,7 @@ const profile = {
   name: 'contentImport',
   displayName: 'content import',
   version: packageJson.version,
-  methods: ['resolve', 'resolveAndSave']
+  methods: ['resolve', 'resolveAndSave', 'isExternalUrl']
 }
 
 module.exports = class CompilerImports extends Plugin {
@@ -105,6 +105,15 @@ module.exports = class CompilerImports extends Plugin {
     return /^([^/]+)/.exec(url)
   }
 
+  isExternalUrl (url) {
+    for (const handler of this.handlers()) {
+      if (handler.match.exec(url)) {
+        return true
+      }
+    }
+    return false
+  }
+
   /**
     * resolve the content of @arg url. This only resolves external URLs.
     *