Setup spotlight project

.stoplight/custom-functions/oasUnusedComponent.js

@@ -0,0 +1,50 @@
+import { unreferencedReusableObject } from '@stoplight/spectral-functions';
+import { createRulesetFunction } from '@stoplight/spectral-core';
+
+function isObject(value) {
+  return value !== null && typeof value === 'object';
+}
+
+export default createRulesetFunction(
+  {
+    input: {
+      type: 'object',
+      properties: {
+        components: {
+          type: 'object',
+        },
+      },
+      required: ['components'],
+    },
+    options: null,
+  },
+  function oasUnusedComponent(targetVal, opts, context) {
+    const results = [];
+    const componentTypes = [
+      'schemas',
+      'responses',
+      'parameters',
+      'examples',
+      'requestBodies',
+      'headers',
+      'links',
+      'callbacks',
+    ];
+
+    for (const type of componentTypes) {
+      const value = targetVal.components[type];
+      if (!isObject(value)) continue;
+
+      const resultsForType = unreferencedReusableObject(
+        value,
+        { reusableObjectsLocation: `#/components/${type}` },
+        context,
+      );
+      if (resultsForType !== void 0 && Array.isArray(resultsForType)) {
+        results.push(...resultsForType);
+      }
+    }
+
+    return results;
+  },
+);