Setup spotlight project

.stoplight/custom-functions/refSiblings.js

@@ -0,0 +1,51 @@
+function isObject(value) {
+  return value !== null && typeof value === 'object';
+}
+
+function getParentValue(document, path) {
+  if (path.length === 0) {
+    return null;
+  }
+
+  let piece = document;
+
+  for (let i = 0; i < path.length - 1; i += 1) {
+    if (!isObject(piece)) {
+      return null;
+    }
+
+    piece = piece[path[i]];
+  }
+
+  return piece;
+}
+
+const refSiblings = (targetVal, opts, { document, path }) => {
+  const value = getParentValue(document.data, path);
+
+  if (!isObject(value)) {
+    return;
+  }
+
+  const keys = Object.keys(value);
+  if (keys.length === 1) {
+    return;
+  }
+
+  const results = [];
+  const actualObjPath = path.slice(0, -1);
+
+  for (const key of keys) {
+    if (key === '$ref') {
+      continue;
+    }
+    results.push({
+      message: '$ref must not be placed next to any other properties',
+      path: [...actualObjPath, key],
+    });
+  }
+
+  return results;
+};
+
+export default refSiblings;