feat(client): add support for endpoint-specific base URLs

Author: stainless-app[bot]

src/core.ts

@@ -170,6 +170,7 @@ export class APIPromise<T> extends Promise<T> {
 
 export abstract class APIClient {
   baseURL: string;
+  #baseURLOverridden: boolean;
   maxRetries: number;
   timeout: number;
   httpAgent: Agent | undefined;
@@ -179,18 +180,21 @@ export abstract class APIClient {
 
   constructor({
     baseURL,
+    baseURLOverridden,
     maxRetries = 2,
     timeout = 60000, // 1 minute
     httpAgent,
     fetch: overriddenFetch,
   }: {
     baseURL: string;
+    baseURLOverridden: boolean;
     maxRetries?: number | undefined;
     timeout: number | undefined;
     httpAgent: Agent | undefined;
     fetch: Fetch | undefined;
   }) {
     this.baseURL = baseURL;
+    this.#baseURLOverridden = baseURLOverridden;
     this.maxRetries = validatePositiveInteger('maxRetries', maxRetries);
     this.timeout = validatePositiveInteger('timeout', timeout);
     this.httpAgent = httpAgent;
@@ -300,7 +304,7 @@ export abstract class APIClient {
     { retryCount = 0 }: { retryCount?: number } = {},
   ): { req: RequestInit; url: string; timeout: number } {
     const options = { ...inputOptions };
-    const { method, path, query, headers: headers = {} } = options;
+    const { method, path, query, defaultBaseURL, headers: headers = {} } = options;
 
     const body =
       ArrayBuffer.isView(options.body) || (options.__binaryRequest && typeof options.body === 'string') ?
@@ -310,7 +314,7 @@ export abstract class APIClient {
       : null;
     const contentLength = this.calculateContentLength(body);
 
-    const url = this.buildURL(path!, query);
+    const url = this.buildURL(path!, query, defaultBaseURL);
     if ('timeout' in options) validatePositiveInteger('timeout', options.timeout);
     options.timeout = options.timeout ?? this.timeout;
     const httpAgent = options.httpAgent ?? this.httpAgent ?? getDefaultAgent(url);
@@ -503,11 +507,12 @@ export abstract class APIClient {
     return new PagePromise<PageClass, Item>(this, request, Page);
   }
 
-  buildURL<Req>(path: string, query: Req | null | undefined): string {
+  buildURL<Req>(path: string, query: Req | null | undefined, defaultBaseURL?: string | undefined): string {
+    const baseURL = (!this.#baseURLOverridden && defaultBaseURL) || this.baseURL;
     const url =
       isAbsoluteURL(path) ?
         new URL(path)
-      : new URL(this.baseURL + (this.baseURL.endsWith('/') && path.startsWith('/') ? path.slice(1) : path));
+      : new URL(baseURL + (baseURL.endsWith('/') && path.startsWith('/') ? path.slice(1) : path));
 
     const defaultQuery = this.defaultQuery();
     if (!isEmptyObj(defaultQuery)) {
@@ -792,6 +797,7 @@ export type RequestOptions<
   query?: Req | undefined;
   body?: Req | null | undefined;
   headers?: Headers | undefined;
+  defaultBaseURL?: string | undefined;
 
   maxRetries?: number;
   stream?: boolean | undefined;
@@ -813,6 +819,7 @@ const requestOptionsKeys: KeysEnum<RequestOptions> = {
   query: true,
   body: true,
   headers: true,
+  defaultBaseURL: true,
 
   maxRetries: true,
   stream: true,

src/index.ts

@@ -147,6 +147,7 @@ export class ZeroEntropy extends Core.APIClient {
 
     super({
       baseURL: options.baseURL!,
+      baseURLOverridden: baseURL ? baseURL !== 'https://api.zeroentropy.dev/v1' : false,
       timeout: options.timeout ?? 60000 /* 1 minute */,
       httpAgent: options.httpAgent,
       maxRetries: options.maxRetries,
@@ -165,6 +166,13 @@ export class ZeroEntropy extends Core.APIClient {
   queries: API.Queries = new API.Queries(this);
   parsers: API.Parsers = new API.Parsers(this);
 
+  /**
+   * Check whether the base URL is set to its default.
+   */
+  #baseURLOverridden(): boolean {
+    return this.baseURL !== 'https://api.zeroentropy.dev/v1';
+  }
+
   protected override defaultQuery(): Core.DefaultQuery | undefined {
     return this._options.defaultQuery;
   }

tests/index.test.ts

@@ -185,6 +185,28 @@ describe('instantiate client', () => {
       const client = new ZeroEntropy({ apiKey: 'My API Key' });
       expect(client.baseURL).toEqual('https://api.zeroentropy.dev/v1');
     });
+
+    test('in request options', () => {
+      const client = new ZeroEntropy({ apiKey: 'My API Key' });
+      expect(client.buildURL('/foo', null, 'http://localhost:5000/option')).toEqual(
+        'http://localhost:5000/option/foo',
+      );
+    });
+
+    test('in request options overridden by client options', () => {
+      const client = new ZeroEntropy({ apiKey: 'My API Key', baseURL: 'http://localhost:5000/client' });
+      expect(client.buildURL('/foo', null, 'http://localhost:5000/option')).toEqual(
+        'http://localhost:5000/client/foo',
+      );
+    });
+
+    test('in request options overridden by env variable', () => {
+      process.env['ZEROENTROPY_BASE_URL'] = 'http://localhost:5000/env';
+      const client = new ZeroEntropy({ apiKey: 'My API Key' });
+      expect(client.buildURL('/foo', null, 'http://localhost:5000/option')).toEqual(
+        'http://localhost:5000/env/foo',
+      );
+    });
   });
 
   test('maxRetries option is correctly set', () => {