feat(rest): add isProxied (#2957)

Adds the `isProxied` property to rest.
This effectively removes the `startWith('https://discord.com/api')` check.

packages/rest/src/manager.ts

@@ -62,11 +62,14 @@ export function createRestManager(options: CreateRestManagerOptions): RestManage
     )
   }
 
+  const baseUrl = options.proxy?.baseUrl ?? 'https://discord.com/api'
+
   const rest: RestManager = {
     token: options.token,
     applicationId,
     version: options.version ?? 10,
-    baseUrl: options.proxy?.baseUrl ?? 'https://discord.com/api',
+    baseUrl,
+    isProxied: !baseUrl.startsWith('https://discord.com/api'),
     maxRetryCount: Infinity,
     globallyRateLimited: false,
     processingRateLimitedPaths: false,
@@ -396,8 +399,8 @@ export function createRestManager(options: CreateRestManagerOptions): RestManage
     },
 
     async makeRequest(method, route, options) {
-      if (!rest.baseUrl.startsWith('https://discord.com') && route[0] === '/') {
-        const result = await fetch(`${rest.baseUrl}${route}`, rest.createRequestBody(method, options))
+      if (rest.isProxied) {
+        const result = await fetch(`${rest.baseUrl}/v${rest.version}${route}`, rest.createRequestBody(method, options))
 
         if (!result.ok) {
           const err = (await result.json().catch(() => {})) as Record<string, any>

packages/rest/src/types.ts

@@ -136,6 +136,12 @@ export interface RestManager {
    * @default https://discord.com/api
    */
   baseUrl: string
+  /**
+   * `true` if the `baseUrl` does not start with `https://discord.com/api`.
+   *
+   * Mostly used only for intern functions.
+   */
+  isProxied: boolean
   /** The authorization header to attach when sending requests to the proxy. */
   authorization?: string
   /** The maximum amount of times a request should be retried. Defaults to Infinity */