fetchのパラメータを指定できるようにする。

src/index.ts

@@ -1,4 +1,5 @@
 import type NarouNovel from "./narou.js";
+import type { ExecuteOptions } from "./narou.js";
 import NarouNovelFetch from "./narou-fetch.js";
 import NarouNovelJsonp from "./narou-jsonp.js";
 import RankingBuilder from "./ranking.js";
@@ -67,13 +68,16 @@ export function ranking(api: NarouNovel = narouNovelFetch): RankingBuilder {
 /**
  * なろう殿堂入り API でランキング履歴を取得する
  * @param {string} ncode 小説のNコード
+ * @param {ExecuteOptions} [options] 実行オプション
+ * @param {NarouNovel} [api] API実行クラスのインスタンス
  * @see https://dev.syosetu.com/man/rankinapi/
  */
 export async function rankingHistory(
   ncode: string,
+  options?: ExecuteOptions,
   api: NarouNovel = narouNovelFetch
 ): Promise<RankingHistoryResult[]> {
-  const result = await api.executeRankingHistory({ ncode });
+  const result = await api.executeRankingHistory({ ncode }, options);
   if (Array.isArray(result)) {
     return result.map(formatRankingHistory);
   } else {

src/narou-fetch.ts

@@ -1,6 +1,6 @@
 import { unzipp } from "./util/unzipp.js";
 import NarouNovel from "./narou.js";
-import type { NarouParams } from "./narou.js";
+import type { NarouParams, ExecuteOptions } from "./narou.js";
 
 type Fetch = typeof fetch;
 
@@ -18,7 +18,8 @@ export default class NarouNovelFetch extends NarouNovel {
 
   protected async execute<T>(
     params: NarouParams,
-    endpoint: string
+    endpoint: string,
+    options?: ExecuteOptions
   ): Promise<T> {
     const query = { ...params, out: "json" };
 
@@ -36,7 +37,7 @@ export default class NarouNovelFetch extends NarouNovel {
       }
     });
 
-    const res = await (this.fetch ?? fetch)(url);
+    const res = await (this.fetch ?? fetch)(url, options?.fetchOptions);
 
     if (!query.gzip) {
       return (await res.json()) as T;

src/narou-jsonp.ts

@@ -1,5 +1,5 @@
 import NarouNovel from "./narou.js";
-import type { NarouParams } from "./narou.js";
+import type { NarouParams, ExecuteOptions } from "./narou.js";
 import { jsonp } from "./util/jsonp.js";
 
 /**
@@ -8,7 +8,9 @@ import { jsonp } from "./util/jsonp.js";
 export default class NarouNovelJsonp extends NarouNovel {
   protected async execute<T>(
     params: NarouParams,
-    endpoint: string
+    endpoint: string,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _options?: ExecuteOptions
   ): Promise<T> {
     const query = { ...params, out: "jsonp" };
     query.gzip = 0;

src/narou.ts

@@ -21,6 +21,16 @@ export type NarouParams =
   | RankingHistoryParams
   | UserSearchParams;
 
+/**
+ * なろう小説APIへのリクエストオプション
+ */
+export interface ExecuteOptions {
+  /**
+   * fetch関数のオプション
+   */
+  fetchOptions?: RequestInit;
+}
+
 /**
  * なろう小説APIへのリクエストを実行する
  * @class NarouNovel
@@ -35,7 +45,8 @@ export default abstract class NarouNovel {
    */
   protected abstract execute<T>(
     params: NarouParams,
-    endpoint: string
+    endpoint: string,
+    options?: ExecuteOptions
   ): Promise<T>;
 
   /**
@@ -46,9 +57,13 @@ export default abstract class NarouNovel {
    */
   protected async executeSearch<T extends keyof NarouSearchResult>(
     params: SearchParams,
-    endpoint = "https://api.syosetu.com/novelapi/api/"
+    endpoint = "https://api.syosetu.com/novelapi/api/",
+    options?: ExecuteOptions
   ): Promise<NarouSearchResults<NarouSearchResult, T>> {
-    return new NarouSearchResults(await this.execute(params, endpoint), params);
+    return new NarouSearchResults(
+      await this.execute(params, endpoint, options),
+      params
+    );
   }
 
   /**
@@ -58,11 +73,13 @@ export default abstract class NarouNovel {
    * @see https://dev.syosetu.com/man/api/
    */
   async executeNovel<T extends keyof NarouSearchResult>(
-    params: SearchParams
+    params: SearchParams,
+    options?: ExecuteOptions
   ): Promise<NarouSearchResults<NarouSearchResult, T>> {
     return await this.executeSearch(
       params,
-      "https://api.syosetu.com/novelapi/api/"
+      "https://api.syosetu.com/novelapi/api/",
+      options
     );
   }
 
@@ -73,11 +90,13 @@ export default abstract class NarouNovel {
    * @see https://dev.syosetu.com/xman/api/
    */
   async executeNovel18<T extends keyof NarouSearchResult>(
-    params: SearchParams
+    params: SearchParams,
+    options?: ExecuteOptions
   ): Promise<NarouSearchResults<NarouSearchResult, T>> {
     return await this.executeSearch(
       params,
-      "https://api.syosetu.com/novel18api/api/"
+      "https://api.syosetu.com/novel18api/api/",
+      options
     );
   }
 
@@ -87,20 +106,33 @@ export default abstract class NarouNovel {
    * @returns ランキング結果
    * @see https://dev.syosetu.com/man/rankapi/
    */
-  async executeRanking(params: RankingParams): Promise<NarouRankingResult[]> {
-    return await this.execute(params, "https://api.syosetu.com/rank/rankget/");
+  async executeRanking(
+    params: RankingParams,
+    options?: ExecuteOptions
+  ): Promise<NarouRankingResult[]> {
+    return await this.execute(
+      params,
+      "https://api.syosetu.com/rank/rankget/",
+      options
+    );
   }
 
   /**
    * 殿堂入りAPiへのリクエストを実行する
    * @param params クエリパラメータ
+   * @param options 実行オプション
    * @returns ランキング履歴結果
    * @see https://dev.syosetu.com/man/rankinapi/
    */
   async executeRankingHistory(
-    params: RankingHistoryParams
+    params: RankingHistoryParams,
+    options?: ExecuteOptions
   ): Promise<RankingHistoryRawResult[]> {
-    return await this.execute(params, "https://api.syosetu.com/rank/rankin/");
+    return await this.execute(
+      params,
+      "https://api.syosetu.com/rank/rankin/",
+      options
+    );
   }
 
   /**
@@ -110,10 +142,15 @@ export default abstract class NarouNovel {
    * @see https://dev.syosetu.com/man/userapi/
    */
   async executeUserSearch<T extends keyof UserSearchResult>(
-    params: UserSearchParams
+    params: UserSearchParams,
+    options?: ExecuteOptions
   ): Promise<NarouSearchResults<UserSearchResult, T>> {
     return new NarouSearchResults<UserSearchResult, T>(
-      await this.execute(params, "https://api.syosetu.com/userapi/api/"),
+      await this.execute(
+        params,
+        "https://api.syosetu.com/userapi/api/",
+        options
+      ),
       params
     );
   }

src/ranking.ts

@@ -11,6 +11,7 @@ import {
   Fields,
 } from "./params.js";
 import type NarouNovel from "./narou.js";
+import type { ExecuteOptions } from "./narou.js";
 import type { SearchResultFields } from "./narou-search-results.js";
 import { addDays, formatDate } from "./util/date.js";
 
@@ -108,21 +109,24 @@ export default class RankingBuilder {
    * 設定されたパラメータに基づき、なろう小説ランキングAPIへのリクエストを実行します。
    *
    * 返される結果には、Nコード、ポイント、順位が含まれます。
+   * @param options 実行オプション
    * @returns {Promise<NarouRankingResult[]>} ランキング結果の配列
    * @see https://dev.syosetu.com/man/rankapi/#output
    */
-  execute(): Promise<NarouRankingResult[]> {
+  execute(options?: ExecuteOptions): Promise<NarouRankingResult[]> {
     const date = formatDate(this.date$);
     this.set({ rtype: `${date}-${this.type$}` });
-    return this.api.executeRanking(this.params as RankingParams);
+    return this.api.executeRanking(this.params as RankingParams, options);
   }
 
   /**
    * ランキングAPIを実行し、取得したNコードを元になろう小説APIで詳細情報を取得して結合します。
    */
-  async executeWithFields(): Promise<
-    RankingResult<DefaultSearchResultFields>[]
-  >;
+  async executeWithFields(
+    fields?: never[] | undefined,
+    opt?: never[] | undefined,
+    options?: ExecuteOptions
+  ): Promise<RankingResult<DefaultSearchResultFields>[]>;
   /**
    * ランキングAPIを実行し、取得したNコードを元になろう小説APIで詳細情報を取得して結合します。
    *
@@ -131,7 +135,9 @@ export default class RankingBuilder {
    * @returns {Promise<RankingResult<SearchResultFields<TFields>>[]>} 詳細情報を含むランキング結果の配列
    */
   async executeWithFields<TFields extends Fields>(
-    fields: TFields | TFields[]
+    fields: TFields | TFields[],
+    opt?: never | never[],
+    options?: ExecuteOptions
   ): Promise<RankingResult<SearchResultFields<TFields>>[]>;
   /**
    * ランキングAPIを実行し、取得したNコードを元になろう小説APIで詳細情報を取得して結合します。
@@ -141,7 +147,8 @@ export default class RankingBuilder {
    */
   async executeWithFields(
     fields: never[],
-    opt: OptionalFields | OptionalFields[]
+    opt: OptionalFields | OptionalFields[],
+    options?: ExecuteOptions
   ): Promise<RankingResult<DefaultSearchResultFields | "weekly_unique">[]>;
   /**
    * ランキングAPIを実行し、取得したNコードを元になろう小説APIで詳細情報を取得して結合します。
@@ -153,7 +160,8 @@ export default class RankingBuilder {
    */
   async executeWithFields<TFields extends Fields>(
     fields: TFields | TFields[],
-    opt: OptionalFields | OptionalFields[]
+    opt: OptionalFields | OptionalFields[],
+    options?: ExecuteOptions
   ): Promise<RankingResult<SearchResultFields<TFields> | "weekly_unique">[]>;
   /**
    * ランキングAPIを実行し、取得したNコードを元になろう小説APIで詳細情報を取得して結合します。
@@ -169,9 +177,10 @@ export default class RankingBuilder {
     TOpt extends OptionalFields | undefined = undefined
   >(
     fields: TFields | TFields[] = [],
-    opt?: TOpt
+    opt?: TOpt,
+    options?: ExecuteOptions
   ): Promise<RankingResult<SearchResultFields<TFields>>[]> {
-    const ranking = await this.execute();
+    const ranking = await this.execute(options);
     const fields$ = Array.isArray(fields)
       ? fields.length == 0
         ? []
@@ -186,7 +195,7 @@ export default class RankingBuilder {
     }
     builder.ncode(rankingNcodes);
     builder.limit(ranking.length);
-    const result = await builder.execute();
+    const result = await builder.execute(options);
 
     return ranking.map<
       RankingResult<

src/search-builder-r18.ts

@@ -1,4 +1,5 @@
 import { NovelSearchBuilderBase } from "./search-builder.js";
+import type { ExecuteOptions } from "./narou.js";
 import type NarouSearchResults from "./narou-search-results.js";
 import type {
   NarouSearchResult,
@@ -28,10 +29,13 @@ export default class SearchBuilderR18<
   /**
    * なろう小説APIへの検索リクエストを実行する
    * @override
+   * @param options 実行オプション
    * @returns {Promise<NarouSearchResults>} 検索結果
    */
-  execute(): Promise<NarouSearchResults<NarouSearchResult, T | TOpt>> {
-    return this.api.executeNovel18(this.params);
+  execute(
+    options?: ExecuteOptions
+  ): Promise<NarouSearchResults<NarouSearchResult, T | TOpt>> {
+    return this.api.executeNovel18(this.params, options);
   }
 
   /**

src/search-builder.ts

@@ -1,4 +1,5 @@
 import type NarouNovel from "./narou.js";
+import type { ExecuteOptions } from "./narou.js";
 import type {
   NarouSearchResult,
   SearchResultFields,
@@ -40,7 +41,7 @@ export abstract class SearchBuilderBase<
   constructor(
     protected params: TParams = {} as TParams,
     protected api: NarouNovel
-  ) {}
+  ) { }
 
   /**
    * 配列から重複を除去する
@@ -472,10 +473,13 @@ export abstract class NovelSearchBuilderBase<
 
   /**
    * なろう小説APIへの検索リクエストを実行する
+   * @param options 実行オプション
    * @returns {Promise<NarouSearchResults>} 検索結果
    */
-  execute(): Promise<NarouSearchResults<NarouSearchResult, T>> {
-    return this.api.executeNovel(this.params);
+  execute(
+    options?: ExecuteOptions
+  ): Promise<NarouSearchResults<NarouSearchResult, T>> {
+    return this.api.executeNovel(this.params, options);
   }
 }
 

src/user-search.ts

@@ -5,6 +5,7 @@ import type {
 } from "./narou-search-results.js";
 import type { UserFields, UserOrder, UserSearchParams } from "./params.js";
 import { SearchBuilderBase } from "./search-builder.js";
+import type { ExecuteOptions } from "./narou.js";
 
 /**
  * なろうユーザ検索API
@@ -102,9 +103,15 @@ export default class UserSearchBuilder<
 
   /**
    * なろう小説APIへのリクエストを実行する
+   * @param options 実行オプション
    * @returns ランキング
    */
-  execute(): Promise<NarouSearchResults<UserSearchResult, TField>> {
-    return this.api.executeUserSearch(this.params as UserSearchParams);
+  execute(
+    options?: ExecuteOptions
+  ): Promise<NarouSearchResults<UserSearchResult, TField>> {
+    return this.api.executeUserSearch(
+      this.params as UserSearchParams,
+      options
+    );
   }
 }

test/narou-fetch.test.ts

@@ -166,4 +166,23 @@ describe('NarouNovelFetch', () => {
     // リクエストが呼ばれたことを確認
     expect(requestSpy).toHaveBeenCalled();
   });
+
+  it('should pass fetchOptions to fetch', async () => {
+    // MSWでエンドポイントをモック
+    server.use(
+      http.get('https://api.example.com', ({ request }) => {
+        expect(request.headers.get('user-agent')).toBe('node-narou');
+        return responseGzipOrJson(mockData, new URL(request.url));
+      })
+    );
+
+    const narouFetch = new NarouNovelFetch();
+
+    // @ts-expect-error - Accessing protected method for testing
+    await narouFetch.execute(
+      { gzip: 0 },
+      'https://api.example.com',
+      { fetchOptions: { headers: { 'user-agent': 'node-narou' } } }
+    );
+  });
 });