feat: add type safety to AniList fetching methods

src/libs/anilist/anilist-do.ts

@@ -1,3 +1,4 @@
+import type { TypedDocumentNode } from "@graphql-typed-document-node/core";
 import { DurableObject } from "cloudflare:workers";
 import { type ResultOf } from "gql.tada";
 import { print } from "graphql";
@@ -35,11 +36,11 @@ export class AnilistDurableObject extends DurableObject {
     super(state, env);
     this.state = state;
   }
-  async fetch(request: Request): Promise<Response> {
+  async fetch(request: Request) {
     return new Response("Not found", { status: 404 });
   }
 
-  async getTitle(id: number, token?: string): Promise<any> {
+  async getTitle(id: number, token?: string) {
     const storageKey = id.toString();
     const cache = await this.state.storage.get(storageKey);
     if (cache) {
@@ -75,7 +76,7 @@ export class AnilistDurableObject extends DurableObject {
     return media;
   }
 
-  async getNextEpisodeAiringAt(id: number): Promise<any> {
+  async getNextEpisodeAiringAt(id: number) {
     const storageKey = `next_airing:${id}`;
     const TTL = 60 * 60 * 1000;
 
@@ -91,7 +92,7 @@ export class AnilistDurableObject extends DurableObject {
     );
   }
 
-  async search(query: string, page: number, limit: number): Promise<any> {
+  async search(query: string, page: number, limit: number) {
     const storageKey = `search:${JSON.stringify({ query, page, limit })}`;
     const TTL = 60 * 60 * 1000;
     return this.handleCachedRequest(
@@ -114,7 +115,7 @@ export class AnilistDurableObject extends DurableObject {
     nextSeason: any,
     nextYear: number,
     limit: number,
-  ): Promise<any> {
+  ) {
     // No caching for browse popular as it returns a Response object in the original code?
     // Wait, the original code had caching logic but it was commented out or mixed?
     // The original code returned a Response directly for BrowsePopular without caching in the switch case,
@@ -133,11 +134,7 @@ export class AnilistDurableObject extends DurableObject {
     });
   }
 
-  async nextSeasonPopular(
-    nextSeason: any,
-    nextYear: number,
-    limit: number,
-  ): Promise<any> {
+  async nextSeasonPopular(nextSeason: any, nextYear: number, limit: number) {
     const storageKey = `next_season:${JSON.stringify({ nextSeason, nextYear, limit })}`;
     const TTL = 60 * 60 * 1000;
     return this.handleCachedRequest(
@@ -158,7 +155,7 @@ export class AnilistDurableObject extends DurableObject {
     limit: number,
     season: any,
     seasonYear: number,
-  ): Promise<any> {
+  ) {
     // The original code had unreachable cache logic.
     // I will implement it with caching if possible, but let's follow the pattern.
     // Actually, let's enable caching as it seems intended.
@@ -179,7 +176,7 @@ export class AnilistDurableObject extends DurableObject {
     );
   }
 
-  async getTrendingTitles(page: number, limit: number): Promise<any> {
+  async getTrendingTitles(page: number, limit: number) {
     const storageKey = `trending:${JSON.stringify({ page, limit })}`;
     const TTL = 60 * 60 * 1000;
     return this.handleCachedRequest(
@@ -199,7 +196,7 @@ export class AnilistDurableObject extends DurableObject {
     page: number,
     airingAtLowerBound: number,
     airingAtUpperBound: number,
-  ): Promise<any> {
+  ) {
     const storageKey = `upcoming:${JSON.stringify({ page, airingAtLowerBound, airingAtUpperBound })}`;
     const TTL = 60 * 60 * 1000;
     return this.handleCachedRequest(
@@ -216,7 +213,7 @@ export class AnilistDurableObject extends DurableObject {
     );
   }
 
-  async getUser(token: string): Promise<any> {
+  async getUser(token: string) {
     const storageKey = `user:${token}`;
     // 1 month
     const TTL = 60 * 60 * 24 * 30 * 1000;
@@ -230,7 +227,7 @@ export class AnilistDurableObject extends DurableObject {
     );
   }
 
-  async getUserProfile(token: string): Promise<any> {
+  async getUserProfile(token: string) {
     const data = await this.fetchFromAnilist(
       GetUserProfileQuery,
       { token },
@@ -243,7 +240,7 @@ export class AnilistDurableObject extends DurableObject {
     titleId: number,
     episodeNumber: number,
     token: string,
-  ): Promise<any> {
+  ) {
     const data = await this.fetchFromAnilist(
       MarkEpisodeAsWatchedMutation,
       { titleId, episodeNumber },
@@ -252,7 +249,7 @@ export class AnilistDurableObject extends DurableObject {
     return data?.SaveMediaListEntry;
   }
 
-  async markTitleAsWatched(titleId: number, token: string): Promise<any> {
+  async markTitleAsWatched(titleId: number, token: string) {
     const data = await this.fetchFromAnilist(
       MarkTitleAsWatchedMutation,
       { titleId },
@@ -289,9 +286,9 @@ export class AnilistDurableObject extends DurableObject {
   }
 
   // Helper to handle caching logic
-  async handleCachedRequest(
+  async handleCachedRequest<T>(
     key: string,
-    fetcher: () => Promise<any>,
+    fetcher: () => Promise<T>,
     ttl?: number,
   ) {
     const cache = await this.state.storage.get(key);
@@ -325,11 +322,11 @@ export class AnilistDurableObject extends DurableObject {
     }
   }
 
-  async fetchFromAnilist(
-    query: any,
-    variables: any,
+  async fetchFromAnilist<Result = any, Variables = any>(
+    query: TypedDocumentNode<Result, Variables>,
+    variables: Variables,
     token?: string | undefined,
-  ): Promise<any> {
+  ): Promise<Result> {
     const headers: any = {
       "Content-Type": "application/json",
     };