feat: WIP add support for native fetch; undici on node.js < 18, and refactor conversation support

package.json

@@ -19,13 +19,14 @@
     "build"
   ],
   "engines": {
-    "node": ">=14"
+    "node": ">=16.8"
   },
   "scripts": {
     "build": "tsup",
     "dev": "tsup --watch",
     "clean": "del build",
     "prebuild": "run-s clean",
+    "postbuild": "sed -i 's/ *\\?\\? *(await import(\"undici\")).fetch//' build/browser/index.js",
     "predev": "run-s clean",
     "pretest": "run-s build",
     "docs": "typedoc",
@@ -38,7 +39,6 @@
   "dependencies": {
     "eventsource-parser": "^0.0.5",
     "expiry-map": "^2.0.0",
-    "node-fetch": "2",
     "remark": "^14.0.2",
     "strip-markdown": "^5.0.0",
     "uuid": "^9.0.0"
@@ -46,7 +46,6 @@
   "devDependencies": {
     "@trivago/prettier-plugin-sort-imports": "^4.0.0",
     "@types/node": "^18.11.9",
-    "@types/node-fetch": "2",
     "@types/uuid": "^9.0.0",
     "ava": "^5.1.0",
     "del-cli": "^5.0.0",
@@ -89,5 +88,8 @@
     "ai",
     "ml",
     "bot"
-  ]
+  ],
+  "optionalDependencies": {
+    "undici": "^5.13.0"
+  }
 }

pnpm-lock.yaml

@@ -3,7 +3,6 @@ lockfileVersion: 5.4
 specifiers:
   '@trivago/prettier-plugin-sort-imports': ^4.0.0
   '@types/node': ^18.11.9
-  '@types/node-fetch': '2'
   '@types/uuid': ^9.0.0
   ava: ^5.1.0
   del-cli: ^5.0.0
@@ -12,7 +11,6 @@ specifiers:
   expiry-map: ^2.0.0
   husky: ^8.0.2
   lint-staged: ^13.0.3
-  node-fetch: '2'
   npm-run-all: ^4.1.5
   ora: ^6.1.2
   prettier: ^2.8.0
@@ -23,20 +21,22 @@ specifiers:
   typedoc: ^0.23.21
   typedoc-plugin-markdown: ^3.13.6
   typescript: ^4.9.3
+  undici: ^5.13.0
   uuid: ^9.0.0
 
 dependencies:
   eventsource-parser: 0.0.5
   expiry-map: 2.0.0
-  node-fetch: 2.6.7
   remark: 14.0.2
   strip-markdown: 5.0.0
   uuid: 9.0.0
 
+optionalDependencies:
+  undici: 5.13.0
+
 devDependencies:
   '@trivago/prettier-plugin-sort-imports': 4.0.0_prettier@2.8.0
   '@types/node': 18.11.10
-  '@types/node-fetch': 2.6.2
   '@types/uuid': 9.0.0
   ava: 5.1.0
   del-cli: 5.0.0
@@ -434,13 +434,6 @@ packages:
     resolution: {integrity: sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==}
     dev: false
 
-  /@types/node-fetch/2.6.2:
-    resolution: {integrity: sha512-DHqhlq5jeESLy19TYhLakJ07kNumXWjcDdxXsLUMJZ6ue8VZJj4kLPQVE/2mdHh3xZziNF1xppu5lwmS53HR+A==}
-    dependencies:
-      '@types/node': 18.11.10
-      form-data: 3.0.1
-    dev: true
-
   /@types/node/18.11.10:
     resolution: {integrity: sha512-juG3RWMBOqcOuXC643OAdSA525V44cVgGV6dUDuiFtss+8Fk5x1hI93Rsld43VeJVIeqlP9I7Fn9/qaVqoEAuQ==}
     dev: true
@@ -568,10 +561,6 @@ packages:
     engines: {node: '>=8'}
     dev: true
 
-  /asynckit/0.4.0:
-    resolution: {integrity: sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==}
-    dev: true
-
   /ava/5.1.0:
     resolution: {integrity: sha512-e5VFrSQ0WBPyZJWRXVrO7RFOizFeNM0t2PORwrPvWtApgkORI6cvGnY3GX1G+lzpd0HjqNx5Jus22AhxVnUMNA==}
     engines: {node: '>=14.19 <15 || >=16.15 <17 || >=18'}
@@ -712,6 +701,14 @@ packages:
       load-tsconfig: 0.2.3
     dev: true
 
+  /busboy/1.6.0:
+    resolution: {integrity: sha512-8SFQbg/0hQ9xy3UNTB0YEnsNBbWfhf7RtnzpL7TkBiTBRfrQ9Fxcnz7VJsleJpyp6rVLvXiuORqjlHi5q+PYuA==}
+    engines: {node: '>=10.16.0'}
+    dependencies:
+      streamsearch: 1.1.0
+    dev: false
+    optional: true
+
   /cac/6.7.14:
     resolution: {integrity: sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ==}
     engines: {node: '>=8'}
@@ -899,13 +896,6 @@ packages:
     resolution: {integrity: sha512-3tlv/dIP7FWvj3BsbHrGLJ6l/oKh1O3TcgBqMn+yyCagOxc23fyzDS6HypQbgxWbkpDnf52p1LuR4eWDQ/K9WQ==}
     dev: true
 
-  /combined-stream/1.0.8:
-    resolution: {integrity: sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==}
-    engines: {node: '>= 0.8'}
-    dependencies:
-      delayed-stream: 1.0.0
-    dev: true
-
   /commander/4.1.1:
     resolution: {integrity: sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==}
     engines: {node: '>= 6'}
@@ -1053,11 +1043,6 @@ packages:
       slash: 4.0.0
     dev: true
 
-  /delayed-stream/1.0.0:
-    resolution: {integrity: sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==}
-    engines: {node: '>=0.4.0'}
-    dev: true
-
   /dequal/2.0.3:
     resolution: {integrity: sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==}
     engines: {node: '>=6'}
@@ -1491,15 +1476,6 @@ packages:
       path-exists: 5.0.0
     dev: true
 
-  /form-data/3.0.1:
-    resolution: {integrity: sha512-RHkBKtLWUVwd7SqRIvCZMEvAMoGUp0XU+seQiZejj0COz3RI3hWP4sCv3gZWWLjJTd7rGwcsF5eKZGii0r/hbg==}
-    engines: {node: '>= 6'}
-    dependencies:
-      asynckit: 0.4.0
-      combined-stream: 1.0.8
-      mime-types: 2.1.35
-    dev: true
-
   /fs.realpath/1.0.0:
     resolution: {integrity: sha512-OO0pH2lK6a0hZnAdau5ItzHPI6pUlvI7jMVnxUQRtw4owF2wk8lOSabtGDCTP4Ggrg2MbGnWO9X8K1t4+fGMDw==}
     dev: true
@@ -2426,18 +2402,6 @@ packages:
       picomatch: 2.3.1
     dev: true
 
-  /mime-db/1.52.0:
-    resolution: {integrity: sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==}
-    engines: {node: '>= 0.6'}
-    dev: true
-
-  /mime-types/2.1.35:
-    resolution: {integrity: sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==}
-    engines: {node: '>= 0.6'}
-    dependencies:
-      mime-db: 1.52.0
-    dev: true
-
   /mimic-fn/2.1.0:
     resolution: {integrity: sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==}
     engines: {node: '>=6'}
@@ -2507,18 +2471,6 @@ packages:
     resolution: {integrity: sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==}
     dev: true
 
-  /node-fetch/2.6.7:
-    resolution: {integrity: sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==}
-    engines: {node: 4.x || >=6.0.0}
-    peerDependencies:
-      encoding: ^0.1.0
-    peerDependenciesMeta:
-      encoding:
-        optional: true
-    dependencies:
-      whatwg-url: 5.0.0
-    dev: false
-
   /node-releases/2.0.6:
     resolution: {integrity: sha512-PiVXnNuFm5+iYkLBNeq5211hvO38y63T0i2KKh2KnUs3RpzJ+JtODFjkD8yjLwnDkTYF1eKXheUwdssR+NRZdg==}
     dev: true
@@ -3210,6 +3162,12 @@ packages:
       escape-string-regexp: 2.0.0
     dev: true
 
+  /streamsearch/1.1.0:
+    resolution: {integrity: sha512-Mcc5wHehp9aXz1ax6bZUyY5afg9u2rv5cqQI3mRrYkGC8rW2hM02jWuwjtL++LS5qinSyhj2QfLyNsuc+VsExg==}
+    engines: {node: '>=10.0.0'}
+    dev: false
+    optional: true
+
   /string-argv/0.3.1:
     resolution: {integrity: sha512-a1uQGz7IyVy9YwhqjZIZu1c8JO8dNIe20xBmSS6qu9kv++k3JGzCVmprbNN5Kn+BgzD5E7YYwg1CcjuJMRNsvg==}
     engines: {node: '>=0.6.19'}
@@ -3382,10 +3340,6 @@ packages:
       is-number: 7.0.0
     dev: true
 
-  /tr46/0.0.3:
-    resolution: {integrity: sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==}
-    dev: false
-
   /tr46/1.0.1:
     resolution: {integrity: sha512-dTpowEjclQ7Kgx5SdBkqRzVhERQXov8/l9Ft9dVM9fmg0W0KQSVaXX9T4i6twCPNtYiZM53lpSSUAwJbFPOHxA==}
     dependencies:
@@ -3522,6 +3476,15 @@ packages:
       which-boxed-primitive: 1.0.2
     dev: true
 
+  /undici/5.13.0:
+    resolution: {integrity: sha512-UDZKtwb2k7KRsK4SdXWG7ErXiL7yTGgLWvk2AXO1JMjgjh404nFo6tWSCM2xMpJwMPx3J8i/vfqEh1zOqvj82Q==}
+    engines: {node: '>=12.18'}
+    requiresBuild: true
+    dependencies:
+      busboy: 1.6.0
+    dev: false
+    optional: true
+
   /unified/10.1.2:
     resolution: {integrity: sha512-pUSWAi/RAnVy1Pif2kAoeWNBa3JVrx0MId2LASj8G+7AiHWoKZNTomq6LG326T68U7/e263X6fTdcXIy7XnF7Q==}
     dependencies:
@@ -3627,10 +3590,6 @@ packages:
       defaults: 1.0.4
     dev: true
 
-  /webidl-conversions/3.0.1:
-    resolution: {integrity: sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==}
-    dev: false
-
   /webidl-conversions/4.0.2:
     resolution: {integrity: sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==}
     dev: true
@@ -3640,13 +3599,6 @@ packages:
     engines: {node: '>=6'}
     dev: true
 
-  /whatwg-url/5.0.0:
-    resolution: {integrity: sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==}
-    dependencies:
-      tr46: 0.0.3
-      webidl-conversions: 3.0.1
-    dev: false
-
   /whatwg-url/7.1.0:
     resolution: {integrity: sha512-WUu7Rg1DroM7oQvGWfOiAK21n74Gg+T4elXEQYkOhtyLeWiJFoOGLXPKI/9gzIie9CtwVLm8wtw6YJdKyxSjeg==}
     dependencies:

src/chatgpt-api.test.ts

@@ -63,7 +63,7 @@ if (!isCI) {
       },
       {
         message:
-          'ChatGPT failed to refresh auth token. Error: session token has expired'
+          'ChatGPT failed to refresh auth token. Error: session token may have expired'
       }
     )
   })

src/chatgpt-api.ts

@@ -2,6 +2,7 @@ import ExpiryMap from 'expiry-map'
 import { v4 as uuidv4 } from 'uuid'
 
 import * as types from './types'
+import { ChatGPTConversation } from './chatgpt-conversation'
 import { fetch } from './fetch'
 import { fetchSSE } from './fetch-sse'
 import { markdownToText } from './utils'
@@ -10,80 +11,10 @@ const KEY_ACCESS_TOKEN = 'accessToken'
 const USER_AGENT =
   'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36'
 
-/**
- * A conversation wrapper around the ChatGPT API. This allows you to send
- * multiple messages to ChatGPT and receive responses, without having to
- * manually pass the conversation ID and parent message ID for each message.
- */
-class Conversation {
-  api: ChatGPTAPI
-  conversationId: string = undefined
-  parentMessageId: string = undefined
-
-  /**
-   * Creates a new conversation wrapper around the ChatGPT API.
-   * @param api - The ChatGPT API instance to use.
-   */
-  constructor(
-    api: ChatGPTAPI,
-    opts: { conversationId?: string; parentMessageId?: string } = {}
-  ) {
-    this.api = api
-    this.conversationId = opts.conversationId
-    this.parentMessageId = opts.parentMessageId
-  }
-
-  /**
-   * Sends a message to ChatGPT, waits for the response to resolve, and returns
-   * the response.
-   * If this is the first message in the conversation, the conversation ID and
-   * parent message ID will be automatically set.
-   * This allows you to send multiple messages to ChatGPT and receive responses,
-   * without having to manually pass the conversation ID and parent message ID
-   * for each message.
-   * If you want to manually pass the conversation ID and parent message ID,
-   * use `api.sendMessage` instead.
-   *
-   * @param message - The plaintext message to send.
-   * @param opts.onProgress - Optional listener which will be called every time the partial response is updated
-   * @param opts.onConversationResponse - Optional listener which will be called every time a conversation response is received
-   * @returns The plaintext response from ChatGPT.
-   */
-  async sendMessage(
-    message: string,
-    opts: {
-      onProgress?: (partialResponse: string) => void
-      onConversationResponse?: (
-        response: types.ConversationResponseEvent
-      ) => void
-    } = {}
-  ) {
-    const { onProgress, onConversationResponse } = opts
-    if (!this.conversationId) {
-      return this.api.sendMessage(message, {
-        onProgress,
-        onConversationResponse: (response) => {
-          this.conversationId = response.conversation_id
-          this.parentMessageId = response.message.id
-          onConversationResponse?.(response)
-        }
-      })
-    }
-
-    return this.api.sendMessage(message, {
-      conversationId: this.conversationId,
-      parentMessageId: this.parentMessageId,
-      onProgress,
-      onConversationResponse: (response) => {
-        this.conversationId = response.conversation_id
-        this.parentMessageId = response.message.id
-        onConversationResponse?.(response)
-      }
-    })
-  }
-}
-
 export class ChatGPTAPI {
+  public conversationId: string = undefined
+  public parentMessageId: string = undefined
+
   protected _sessionToken: string
   protected _markdown: boolean
   protected _apiBaseUrl: string
@@ -152,10 +83,13 @@ export class ChatGPTAPI {
    * Sends a message to ChatGPT, waits for the response to resolve, and returns
    * the response.
    *
-   * @param message - The plaintext message to send.
-   * @param opts.conversationId - Optional ID of the previous message in a conversation
-   * @param opts.onProgress - Optional listener which will be called every time the partial response is updated
-   * @param opts.onConversationResponse - Optional listener which will be called every time the partial response is updated with the full conversation response
+   * @param message - The prompt message to send
+   * @param opts.conversationId - Optional ID of a conversation to continue
+   * @param opts.parentMessageId - Optional ID of the previous message in the conversation
+   * @param opts.onProgress - Optional function which will be called every time the partial response is updated
+   * @param opts.onConversationResponse - Optional function which will be called every time the partial response is updated with the full conversation response
+   * @param opts.abortSignal - Optional function used to abort the underlying `fetch` call using an [AbortController](https://developer.mozilla.org/en-US/docs/Web/API/AbortController)
+   * @returns The response from ChatGPT
    */
   async sendMessage(
     message: string,
@@ -166,13 +100,15 @@ export class ChatGPTAPI {
       onConversationResponse?: (
         response: types.ConversationResponseEvent
       ) => void
+      abortSignal?: AbortSignal
     } = {}
   ): Promise<string> {
     const {
       conversationId,
       parentMessageId = uuidv4(),
       onProgress,
-      onConversationResponse
+      onConversationResponse,
+      abortSignal
     } = opts
 
     const accessToken = await this.refreshAccessToken()
@@ -214,6 +150,7 @@ export class ChatGPTAPI {
           'user-agent': this._userAgent
         },
         body: JSON.stringify(body),
+        signal: abortSignal,
         onMessage: (data: string) => {
           if (data === '[DONE]') {
             return resolve(response)
@@ -275,7 +212,7 @@ export class ChatGPTAPI {
       const error = res?.error
       if (error) {
         if (error === 'RefreshAccessTokenError') {
-          throw new Error('session token has expired')
+          throw new Error('session token may have expired')
         } else {
           throw new Error(error)
         }
@@ -289,15 +226,16 @@ export class ChatGPTAPI {
   }
 
   /**
-   * Get a new Conversation instance, which can be used to send multiple messages as part of a single conversation.
+   * Gets a new ChatGPTConversation instance, which can be used to send multiple
+   * messages as part of a single conversation.
    *
-   * @param opts.conversationId - Optional Data of the previous message in a conversation
-   * @param opts.parentMessageId - Optional Data of the previous message in a conversation
-   * @returns a new Conversation instance
+   * @param opts.conversationId - Optional ID of the previous message in a conversation
+   * @param opts.parentMessageId - Optional ID of the previous message in a conversation
+   * @returns The new conversation instance
    */
   getConversation(
     opts: { conversationId?: string; parentMessageId?: string } = {}
   ) {
-    return new Conversation(this, opts)
+    return new ChatGPTConversation(this, opts)
   }
 }

src/chatgpt-conversation.ts

+import * as types from './types'
+import { type ChatGPTAPI } from './chatgpt-api'
+
+/**
+ * A conversation wrapper around the ChatGPTAPI. This allows you to send
+ * multiple messages to ChatGPT and receive responses, without having to
+ * manually pass the conversation ID and parent message ID for each message.
+ */
+export class ChatGPTConversation {
+  api: ChatGPTAPI
+  conversationId: string = undefined
+  parentMessageId: string = undefined
+
+  /**
+   * Creates a new conversation wrapper around the ChatGPT API.
+   *
+   * @param api - The ChatGPT API instance to use
+   * @param opts.conversationId - Optional ID of a conversation to continue
+   * @param opts.parentMessageId - Optional ID of the previous message in the conversation
+   */
+  constructor(
+    api: ChatGPTAPI,
+    opts: { conversationId?: string; parentMessageId?: string } = {}
+  ) {
+    this.api = api
+    this.conversationId = opts.conversationId
+    this.parentMessageId = opts.parentMessageId
+  }
+
+  /**
+   * Sends a message to ChatGPT, waits for the response to resolve, and returns
+   * the response.
+   *
+   * If this is the first message in the conversation, the conversation ID and
+   * parent message ID will be automatically set.
+   *
+   * This allows you to send multiple messages to ChatGPT and receive responses,
+   * without having to manually pass the conversation ID and parent message ID
+   * for each message.
+   *
+   * @param message - The prompt message to send
+   * @param opts.onProgress - Optional listener which will be called every time the partial response is updated
+   * @param opts.onConversationResponse - Optional listener which will be called every time a conversation response is received
+   * @returns The response from ChatGPT
+   */
+  async sendMessage(
+    message: string,
+    opts: {
+      onProgress?: (partialResponse: string) => void
+      onConversationResponse?: (
+        response: types.ConversationResponseEvent
+      ) => void
+    } = {}
+  ): Promise<string> {
+    const { onProgress, onConversationResponse } = opts
+
+    return this.api.sendMessage(message, {
+      conversationId: this.conversationId,
+      parentMessageId: this.parentMessageId,
+      onProgress,
+      onConversationResponse: (response) => {
+        this.conversationId = response.conversation_id
+        this.parentMessageId = response.message.id
+
+        if (onConversationResponse) {
+          return onConversationResponse(response)
+        }
+      }
+    })
+  }
+}

src/demo-conversation.ts

@@ -6,10 +6,10 @@ import { ChatGPTAPI } from '.'
 dotenv.config()
 
 /**
- * Example CLI for testing functionality.
+ * Demo CLI for testing conversation support.
  *
  * ```
- * npx tsx src/demo.ts
+ * npx tsx src/demo-conversation.ts
  * ```
  */
 async function main() {

src/demo.ts

@@ -6,7 +6,7 @@ import { ChatGPTAPI } from '.'
 dotenv.config()
 
 /**
- * Example CLI for testing functionality.
+ * Demo CLI for testing basic functionality.
  *
  * ```
  * npx tsx src/demo.ts

src/fetch-sse.ts

 import { createParser } from 'eventsource-parser'
 
 import { fetch } from './fetch'
-
-// import { streamAsyncIterable } from './stream-async-iterable'
+import { streamAsyncIterable } from './stream-async-iterable'
 
 export async function fetchSSE(
   url: string,
@@ -16,16 +15,8 @@ export async function fetchSSE(
     }
   })
 
-  resp.body.on('readable', () => {
-    let chunk: string | Buffer
-    while (null !== (chunk = resp.body.read())) {
-      parser.feed(chunk.toString())
-    }
-  })
-
-  // TODO: add support for web-compatible `fetch`
-  // for await (const chunk of streamAsyncIterable(resp.body)) {
-  //   const str = new TextDecoder().decode(chunk)
-  //   parser.feed(str)
-  // }
+  for await (const chunk of streamAsyncIterable(resp.body)) {
+    const str = new TextDecoder().decode(chunk)
+    parser.feed(str)
+  }
 }

src/fetch.ts

-import fetch from 'node-fetch'
+/// <reference lib="dom" />
+
+// Use `undici` for node.js 16 and 17
+// Use `fetch` for node.js >= 18
+// Use `fetch` for browsers
+// Use `fetch` for all other environments
+const fetch =
+  globalThis.fetch ??
+  ((await import('undici')).fetch as unknown as typeof globalThis.fetch)
 
 export { fetch }

src/index.ts

 export * from './chatgpt-api'
+export * from './chatgpt-conversation'
 export * from './types'
 export * from './utils'

src/stream-async-iterable.ts

-import { type ReadableStream } from 'stream/web'
-
-export async function* streamAsyncIterable(stream: ReadableStream) {
+export async function* streamAsyncIterable<T>(stream: ReadableStream<T>) {
   const reader = stream.getReader()
   try {
     while (true) {

tsup.config.ts

 import { defineConfig } from 'tsup'
 
-export default defineConfig({
-  entry: ['src/index.ts'],
-  outDir: 'build',
-  target: 'node14',
-  platform: 'node',
-  format: ['esm'],
-  splitting: false,
-  sourcemap: true,
-  minify: true,
-  shims: false,
-  dts: true
-})
+export default defineConfig([
+  {
+    entry: ['src/index.ts'],
+    outDir: 'build',
+    target: 'node16',
+    platform: 'node',
+    format: ['esm'],
+    splitting: false,
+    sourcemap: true,
+    minify: false,
+    shims: true,
+    dts: true,
+    external: ['undici']
+  },
+  {
+    entry: ['src/index.ts'],
+    outDir: 'build/browser',
+    target: 'chrome89',
+    platform: 'browser',
+    format: ['esm'],
+    splitting: false,
+    sourcemap: true,
+    minify: false,
+    shims: true,
+    dts: true,
+    external: ['undici']
+  }
+])