docs: config and response

packages/core/readme.md

@@ -86,22 +86,110 @@ interface HTTP {
 Open a WebSocket connection.
 
 > ![NOTE]
-> Currently we will use [`ws`](https://github.com/websockets/ws) package to polyfill `WebSocket` in Node.js. Once Node.js has a stable WebSocket API, we will switch to it.
+> 
+> Currently we will use [`ws`](https://github.com/websockets/ws) package to polyfill `WebSocket` in Node.js.
+> 
+> Once Node.js has a stable WebSocket API, we will switch to it.
 
 ### Config
 
+```ts
+interface Config {
+  baseURL?: string
+  method?: Method
+  headers?: Record<string, string>
+  redirect?: RequestRedirect
+  keepAlive?: boolean
+  params?: Record<string, any>
+  data?: any
+  responseType?: keyof ResponseTypes
+  timeout?: number
+}
+```
+
+#### config.baseURL
+
+The base URL of the request. If it is set, the `url` will be resolved against it.
+
+See [URL#base](https://developer.mozilla.org/en-US/docs/Web/API/URL/URL#base).
+
 #### config.method
 
+See [fetch#method](https://developer.mozilla.org/en-US/docs/Web/API/fetch#method).
+
 #### config.headers
 
+See [fetch#headers](https://developer.mozilla.org/en-US/docs/Web/API/fetch#headers).
+
+#### config.redirect
+
+See [fetch#redirect](https://developer.mozilla.org/en-US/docs/Web/API/fetch#redirect).
+
+#### config.keepAlive
+
+See [fetch#keepalive](https://developer.mozilla.org/en-US/docs/Web/API/fetch#keepalive).
+
 #### config.params
 
+Additional query parameters. They will be appended to the URL.
+
 #### config.data
 
+The request body. Currently support below types:
+
+- string
+- URLSearchParams
+- ArrayBuffer / ArrayBufferView
+- Blob
+- FormData
+- Object (will be serialized to JSON)
+
 #### config.responseType
 
+Supported response types:
+
+```ts
+interface ResponseTypes {
+  json: any
+  text: string
+  stream: ReadableStream<Uint8Array>
+  blob: Blob
+  formdata: FormData
+  arraybuffer: ArrayBuffer
+}
+```
+
 #### config.timeout
 
+The request timeout in milliseconds.
+
 #### config.proxyAgent
 
 > ![NOTE] In order to use a proxy agent, you need to install `undios-proxy-agent`.
+
+### Response
+
+```ts
+interface Response<T> {
+  status: number
+  statusText: string
+  headers: Headers
+  data: T
+}
+```
+
+#### response.status
+
+See [Response#status](https://developer.mozilla.org/en-US/docs/Web/API/Response/headers).
+
+#### response.statusText
+
+See [Response#statusText](https://developer.mozilla.org/en-US/docs/Web/API/Response/headers).
+
+#### response.headers
+
+See [Response#headers](https://developer.mozilla.org/en-US/docs/Web/API/Response/headers).
+
+#### response.data
+
+The decoded response body.