Revert "Update base-client.ts"

This reverts commit 69f2125.

src/base-client.ts

@@ -37,17 +37,14 @@ export class BaseSlackAPIClient implements BaseSlackClient {
     const body = serializeData(data);
 
     const token = data.token || this.#token || "";
-    const request = new Request(url, {
+    const response = await fetch(url, {
       method: "POST",
       headers: {
         "Authorization": `Bearer ${token}`,
         "Content-Type": "application/x-www-form-urlencoded",
-        "User-Agent": getUserAgent(),
       },
       body,
     });
-    const response = await fetch(request);
-
     if (!response.ok) {
       throw await this.createHttpError(response);
     }
@@ -110,24 +107,3 @@ export function serializeData(data: Record<string, unknown>): URLSearchParams {
 
   return new URLSearchParams(encodedData);
 }
-
-function getUserAgent() {
-  const userAgents = [];
-  userAgents.push(`Deno/${Deno.version.deno}`);
-  userAgents.push(`OS/${Deno.build.os}`);
-  userAgents.push(
-    `deno-slack-api/${getImportVersion()}`,
-  );
-  return userAgents.join(" ");
-}
-
-function getImportVersion() {
-  try {
-    const url = new URL(import.meta.url);
-    if (url.protocol === "file:") {
-      console.log("this module was loaded locally");
-    }
-  } catch (error) {
-    throw Error("no module found");
-  }
-}