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import { createSseClient } from "../core/serverSentEvents.gen.js"
import type { Client, Config, RequestOptions, ResolvedRequestOptions } from "./types.gen.js"
import {
buildUrl,
createConfig,
createInterceptors,
getParseAs,
mergeConfigs,
mergeHeaders,
setAuthParams,
} from "./utils.gen.js"
type ReqInit = Omit<RequestInit, "body" | "headers"> & {
body?: any
headers: ReturnType<typeof mergeHeaders>
}
export const createClient = (config: Config = {}): Client => {
let _config = mergeConfigs(createConfig(), config)
const getConfig = (): Config => ({ ..._config })
const setConfig = (config: Config): Config => {
_config = mergeConfigs(_config, config)
return getConfig()
}
const interceptors = createInterceptors<Request, Response, unknown, ResolvedRequestOptions>()
const beforeRequest = async (options: RequestOptions) => {
const opts = {
..._config,
...options,
fetch: options.fetch ?? _config.fetch ?? globalThis.fetch,
headers: mergeHeaders(_config.headers, options.headers),
serializedBody: undefined,
}
if (opts.security) {
await setAuthParams({
...opts,
security: opts.security,
})
}
if (opts.requestValidator) {
await opts.requestValidator(opts)
}
if (opts.body && opts.bodySerializer) {
opts.serializedBody = opts.bodySerializer(opts.body)
}
// remove Content-Type header if body is empty to avoid sending invalid requests
if (opts.serializedBody === undefined || opts.serializedBody === "") {
opts.headers.delete("Content-Type")
}
const url = buildUrl(opts)
return { opts, url }
}
const request: Client["request"] = async (options) => {
// @ts-expect-error
const { opts, url } = await beforeRequest(options)
const requestInit: ReqInit = {
redirect: "follow",
...opts,
body: opts.serializedBody,
}
let request = new Request(url, requestInit)
for (const fn of interceptors.request._fns) {
if (fn) {
request = await fn(request, opts)
}
}
// fetch must be assigned here, otherwise it would throw the error:
// TypeError: Failed to execute 'fetch' on 'Window': Illegal invocation
const _fetch = opts.fetch!
let response = await _fetch(request)
for (const fn of interceptors.response._fns) {
if (fn) {
response = await fn(response, request, opts)
}
}
const result = {
request,
response,
}
if (response.ok) {
if (response.status === 204 || response.headers.get("Content-Length") === "0") {
return opts.responseStyle === "data"
? {}
: {
data: {},
...result,
}
}
const parseAs =
(opts.parseAs === "auto" ? getParseAs(response.headers.get("Content-Type")) : opts.parseAs) ?? "json"
let data: any
switch (parseAs) {
case "arrayBuffer":
case "blob":
case "formData":
case "json":
case "text":
data = await response[parseAs]()
break
case "stream":
return opts.responseStyle === "data"
? response.body
: {
data: response.body,
...result,
}
}
if (parseAs === "json") {
if (opts.responseValidator) {
await opts.responseValidator(data)
}
if (opts.responseTransformer) {
data = await opts.responseTransformer(data)
}
}
return opts.responseStyle === "data"
? data
: {
data,
...result,
}
}
const textError = await response.text()
let jsonError: unknown
try {
jsonError = JSON.parse(textError)
} catch {
// noop
}
const error = jsonError ?? textError
let finalError = error
for (const fn of interceptors.error._fns) {
if (fn) {
finalError = (await fn(error, response, request, opts)) as string
}
}
finalError = finalError || ({} as string)
if (opts.throwOnError) {
throw finalError
}
// TODO: we probably want to return error and improve types
return opts.responseStyle === "data"
? undefined
: {
error: finalError,
...result,
}
}
const makeMethod = (method: Required<Config>["method"]) => {
const fn = (options: RequestOptions) => request({ ...options, method })
fn.sse = async (options: RequestOptions) => {
const { opts, url } = await beforeRequest(options)
return createSseClient({
...opts,
body: opts.body as BodyInit | null | undefined,
headers: opts.headers as unknown as Record<string, string>,
method,
url,
})
}
return fn
}
return {
buildUrl,
connect: makeMethod("CONNECT"),
delete: makeMethod("DELETE"),
get: makeMethod("GET"),
getConfig,
head: makeMethod("HEAD"),
interceptors,
options: makeMethod("OPTIONS"),
patch: makeMethod("PATCH"),
post: makeMethod("POST"),
put: makeMethod("PUT"),
request,
setConfig,
trace: makeMethod("TRACE"),
} as Client
}
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