chore: make some internal functions async

Author: stainless-app[bot]

src/client.ts

@@ -262,7 +262,7 @@ export class Writer {
    * Create a new client instance re-using the same options given to the current client with optional overriding.
    */
   withOptions(options: Partial<ClientOptions>): this {
-    return new (this.constructor as any as new (props: ClientOptions) => typeof this)({
+    const client = new (this.constructor as any as new (props: ClientOptions) => typeof this)({
       ...this._options,
       baseURL: this.baseURL,
       maxRetries: this.maxRetries,
@@ -274,6 +274,7 @@ export class Writer {
       apiKey: this.apiKey,
       ...options,
     });
+    return client;
   }
 
   /**
@@ -291,7 +292,7 @@ export class Writer {
     return;
   }
 
-  protected authHeaders(opts: FinalRequestOptions): NullableHeaders | undefined {
+  protected async authHeaders(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
     return buildHeaders([{ Authorization: `Bearer ${this.apiKey}` }]);
   }
 
@@ -423,7 +424,9 @@ export class Writer {
 
     await this.prepareOptions(options);
 
-    const { req, url, timeout } = this.buildRequest(options, { retryCount: maxRetries - retriesRemaining });
+    const { req, url, timeout } = await this.buildRequest(options, {
+      retryCount: maxRetries - retriesRemaining,
+    });
 
     await this.prepareRequest(req, { url, options });
 
@@ -501,7 +504,7 @@ export class Writer {
     } with status ${response.status} in ${headersTime - startTime}ms`;
 
     if (!response.ok) {
-      const shouldRetry = this.shouldRetry(response);
+      const shouldRetry = await this.shouldRetry(response);
       if (retriesRemaining && shouldRetry) {
         const retryMessage = `retrying, ${retriesRemaining} attempts remaining`;
 
@@ -619,7 +622,7 @@ export class Writer {
     }
   }
 
-  private shouldRetry(response: Response): boolean {
+  private async shouldRetry(response: Response): Promise<boolean> {
     // Note this is not a standard header.
     const shouldRetryHeader = response.headers.get('x-should-retry');
 
@@ -696,18 +699,18 @@ export class Writer {
     return sleepSeconds * jitter * 1000;
   }
 
-  buildRequest(
+  async buildRequest(
     inputOptions: FinalRequestOptions,
     { retryCount = 0 }: { retryCount?: number } = {},
-  ): { req: FinalizedRequestInit; url: string; timeout: number } {
+  ): Promise<{ req: FinalizedRequestInit; url: string; timeout: number }> {
     const options = { ...inputOptions };
     const { method, path, query, defaultBaseURL } = options;
 
     const url = this.buildURL(path!, query as Record<string, unknown>, defaultBaseURL);
     if ('timeout' in options) validatePositiveInteger('timeout', options.timeout);
     options.timeout = options.timeout ?? this.timeout;
     const { bodyHeaders, body } = this.buildBody({ options });
-    const reqHeaders = this.buildHeaders({ options: inputOptions, method, bodyHeaders, retryCount });
+    const reqHeaders = await this.buildHeaders({ options: inputOptions, method, bodyHeaders, retryCount });
 
     const req: FinalizedRequestInit = {
       method,
@@ -723,7 +726,7 @@ export class Writer {
     return { req, url, timeout: options.timeout };
   }
 
-  private buildHeaders({
+  private async buildHeaders({
     options,
     method,
     bodyHeaders,
@@ -733,7 +736,7 @@ export class Writer {
     method: HTTPMethod;
     bodyHeaders: HeadersLike;
     retryCount: number;
-  }): Headers {
+  }): Promise<Headers> {
     let idempotencyHeaders: HeadersLike = {};
     if (this.idempotencyHeader && method !== 'get') {
       if (!options.idempotencyKey) options.idempotencyKey = this.defaultIdempotencyKey();
@@ -749,7 +752,7 @@ export class Writer {
         ...(options.timeout ? { 'X-Stainless-Timeout': String(Math.trunc(options.timeout / 1000)) } : {}),
         ...getPlatformHeaders(),
       },
-      this.authHeaders(options),
+      await this.authHeaders(options),
       this._options.defaultHeaders,
       bodyHeaders,
       options.headers,

tests/index.test.ts

@@ -26,22 +26,22 @@ describe('instantiate client', () => {
       apiKey: 'My API Key',
     });
 
-    test('they are used in the request', () => {
-      const { req } = client.buildRequest({ path: '/foo', method: 'post' });
+    test('they are used in the request', async () => {
+      const { req } = await client.buildRequest({ path: '/foo', method: 'post' });
       expect(req.headers.get('x-my-default-header')).toEqual('2');
     });
 
-    test('can ignore `undefined` and leave the default', () => {
-      const { req } = client.buildRequest({
+    test('can ignore `undefined` and leave the default', async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         headers: { 'X-My-Default-Header': undefined },
       });
       expect(req.headers.get('x-my-default-header')).toEqual('2');
     });
 
-    test('can be removed with `null`', () => {
-      const { req } = client.buildRequest({
+    test('can be removed with `null`', async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         headers: { 'X-My-Default-Header': null },
@@ -344,7 +344,7 @@ describe('instantiate client', () => {
   });
 
   describe('withOptions', () => {
-    test('creates a new client with overridden options', () => {
+    test('creates a new client with overridden options', async () => {
       const client = new Writer({ baseURL: 'http://localhost:5000/', maxRetries: 3, apiKey: 'My API Key' });
 
       const newClient = client.withOptions({
@@ -365,7 +365,7 @@ describe('instantiate client', () => {
       expect(newClient.constructor).toBe(client.constructor);
     });
 
-    test('inherits options from the parent client', () => {
+    test('inherits options from the parent client', async () => {
       const client = new Writer({
         baseURL: 'http://localhost:5000/',
         defaultHeaders: { 'X-Test-Header': 'test-value' },
@@ -380,7 +380,7 @@ describe('instantiate client', () => {
       // Test inherited options remain the same
       expect(newClient.buildURL('/foo', null)).toEqual('http://localhost:5001/foo?test-param=test-value');
 
-      const { req } = newClient.buildRequest({ path: '/foo', method: 'get' });
+      const { req } = await newClient.buildRequest({ path: '/foo', method: 'get' });
       expect(req.headers.get('x-test-header')).toEqual('test-value');
     });
 
@@ -430,8 +430,8 @@ describe('request building', () => {
   const client = new Writer({ apiKey: 'My API Key' });
 
   describe('custom headers', () => {
-    test('handles undefined', () => {
-      const { req } = client.buildRequest({
+    test('handles undefined', async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         body: { value: 'hello' },
@@ -466,8 +466,8 @@ describe('default encoder', () => {
     }
   }
   for (const jsonValue of [{}, [], { __proto__: null }, new Serializable(), new Collection(['item'])]) {
-    test(`serializes ${util.inspect(jsonValue)} as json`, () => {
-      const { req } = client.buildRequest({
+    test(`serializes ${util.inspect(jsonValue)} as json`, async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         body: jsonValue,
@@ -490,7 +490,7 @@ describe('default encoder', () => {
     asyncIterable,
   ]) {
     test(`converts ${util.inspect(streamValue)} to ReadableStream`, async () => {
-      const { req } = client.buildRequest({
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         body: streamValue,
@@ -503,7 +503,7 @@ describe('default encoder', () => {
   }
 
   test(`can set content-type for ReadableStream`, async () => {
-    const { req } = client.buildRequest({
+    const { req } = await client.buildRequest({
       path: '/foo',
       method: 'post',
       body: new Response('a\nb\nc\n').body,