fix: throw error for invalid $refs missing the /

lib/dereference.js

@@ -3,6 +3,7 @@ const { ono } = require('@jsdevtools/ono');
 
 const Pointer = require('./pointer');
 const $Ref = require('./ref');
+const { InvalidPointerError } = require('./util/errors');
 const url = require('./util/url');
 
 /**
@@ -82,6 +83,12 @@ function crawl(obj, path, pathFromRoot, parents, processedObjects, dereferencedC
           const keyPath = Pointer.join(path, key);
           const keyPathFromRoot = Pointer.join(pathFromRoot, key);
           const value = obj[key];
+          const splitRef = value?.$ref?.split("/");
+
+          if (splitRef?.length > 1 && splitRef?.includes("#components")) {
+            throw new InvalidPointerError(value.$ref, keyPath);
+          }
+
           let circular = false;
 
           if ($Ref.isAllowed$Ref(value, options)) {

test/specs/invalid-pointers/invalid-pointers.js

@@ -20,6 +20,16 @@ describe('Schema with invalid pointers', function () {
     }
   });
 
+  it('should throw an error for an invalid reference', async function () {
+    try {
+      await $RefParser.dereference(path.rel('specs/invalid-pointers/invalid-reference.json'));
+      helper.shouldNotGetCalled();
+    } catch (err) {
+      expect(err).to.be.an.instanceOf(InvalidPointerError);
+      expect(err.message).to.contain('Invalid $ref pointer "#components/". Pointers must begin with "#/"');
+    }
+  });
+
   it('should throw a grouped error for an invalid pointer if continueOnError is true', async function () {
     const parser = new $RefParser();
     try {

test/specs/invalid-pointers/invalid-reference.json

@@ -0,0 +1,5 @@
+{
+  "foo": {
+    "$ref": "#components/"
+  }
+}