Issue 20 bug

src/BotApi.ts

@@ -19,12 +19,17 @@ export declare namespace BotApi {
   export type Service = BotApiShape
 }
 
+/** @internal */
+export type MethodArgs<M extends keyof MethodParams> = void extends MethodParams[M]
+  ? [params?: MethodParams[M]]
+  : [params: MethodParams[M]]
+
 export interface Method<
   M extends keyof MethodParams,
   E = BotApiError.BotApiError | BotApiTransport.BotApiTransportError,
   R = never,
 > {
-  (params: MethodParams[M]): Effect.Effect<MethodResults[M], E, R>
+  (...args: MethodArgs<M>): Effect.Effect<MethodResults[M], E, R>
 }
 
 export const make: (
@@ -42,7 +47,7 @@ export const layer: Layer.Layer<
 
 export const callMethod: <M extends keyof MethodParams>(
   method: M,
-  params: MethodParams[M],
+  ...args: MethodArgs<M>
 ) => Effect.Effect<
   MethodResults[M],
   BotApiError.BotApiError | BotApiTransport.BotApiTransportError,

test/BotApi.test-d.ts

@@ -0,0 +1,16 @@
+import { describe, it } from 'vitest'
+import * as BotApi from '../src/BotApi.ts'
+
+describe('BotApi', () => {
+  describe('callMethod', () => {
+    it('should not typecheck if no params passed for methods with required params', () => {
+      // @ts-expect-error name is a string
+      BotApi.callMethod('sendMessage')
+    })
+    it('should typecheck if no params passed for methods with all params optional', () => {
+      BotApi.callMethod('getMe')
+      BotApi.callMethod('getAvailableGifts')
+      BotApi.callMethod('getUpdates')
+    })
+  })
+})