Add Telegram::download, closes #1703

src/core/network/client.ts

@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 // for https://gist.github.com/2b1b226d52d675ec246c6f8abdab81ef
 export type { Update, UserFromGetMe } from 'typegram'
-import type { ApiResponse, Typegram } from 'typegram'
+import type { ApiResponse, File, Typegram } from 'typegram'
 import createDebug from 'debug'
 
 const debug = createDebug('telegraf:client')
@@ -126,7 +126,17 @@ export function createClient(token: string, { api } = defaultOptions) {
     }
     return (await res.json()) as ApiResponse<Ret[M]>
   }
-  return { call }
+
+  const download = async (file: File) => {
+    const url = new URL(
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      `./file/${api.mode}${token}/${file.file_path!}`,
+      api.root
+    )
+    return await fetch(url)
+  }
+
+  return { call, download }
 }
 
 export type Client = ReturnType<typeof createClient>

src/telegram.ts

@@ -9,9 +9,11 @@ export type Transformer = EndoFunction<Client['call']>
 
 export class Telegram {
   call: Client['call']
+  readonly download: Client['download']
 
   constructor(client: Client) {
     this.call = client.call
+    this.download = client.download
   }
 
   use(transform: Transformer) {