fixup

Author: ronag

lib/util/cache.js

@@ -19,7 +19,11 @@ function makeCacheKey (opts) {
     headers = {}
   } else if (typeof opts.headers[Symbol.iterator] === 'function') {
     headers = {}
-    for (const [key, val] of opts.headers) {
+    for (const x of opts.headers) {
+      if (!Array.isArray(x)) {
+        throw new Error('opts.headers is not a valid header map')
+      }
+      const [key, val] = x
       if (typeof key !== 'string' || typeof val !== 'string') {
         throw new Error('opts.headers is not a valid header map')
       }
@@ -31,21 +35,16 @@ function makeCacheKey (opts) {
     throw new Error('opts.headers is not an object')
   }
 
-  /**
-   * @type {import('../../types/cache-interceptor.d.ts').default.CacheKey}
-   */
-  const cacheKey = {
+  return {
     origin: opts.origin.toString(),
     method: opts.method,
     path: opts.path,
     headers
   }
-
-  return cacheKey
 }
 
 /**
- * @param {any} value
+ * @param {any} key
  */
 function assertCacheKey (key) {
   if (typeof key !== 'object') {