fix - handle single review result

When getting reviews from goodreads api, if a single result was
returned, it was not returned as an array. I fixed this by casting the result to an array.

src/goodreads.ts

@@ -1,6 +1,7 @@
 import xml from 'fast-xml-parser'
 import he from 'he'
 import got from 'got'
+import { ensureArray } from './type-utils'
 
 export default class Goodreads {
 
@@ -56,8 +57,10 @@ export default class Goodreads {
  },
  })
  .text()
+
  const reviewList: Goodreads.ReviewList = xml.parse(res)
- const reviews = reviewList.GoodreadsResponse.reviews.review
+ // reviews.review can be an array or an item 
+ const reviews = ensureArray(reviewList.GoodreadsResponse.reviews.review)
  return reviews
  }
 

src/type-utils.ts

@@ -0,0 +1,7 @@
+
+export function ensureArray<T>(v: T | T[]): T[] {
+ if (Array.isArray(v)) {
+ return v
+ }
+ return [v]
+}

src/types.d.ts

@@ -19,7 +19,7 @@ declare namespace Goodreads {
  interface ReviewList {
  GoodreadsResponse: {
  reviews: {
- review: Review[];
+ review: Review[] | Review;
  };
  };
  }