- return `import type { ${imports.join(", ")} } from "./types"\nimport { ClientError } from "./client-error"\n\nexport interface ClientOptions {\n readonly baseUrl: string\n readonly fetch?: typeof globalThis.fetch\n readonly headers?: RequestInit["headers"]\n}\n\nexport interface RequestOptions {\n readonly signal?: AbortSignal\n readonly headers?: RequestInit["headers"]\n}\n\ninterface RequestDescriptor {\n readonly method: string\n readonly path: string\n readonly query?: Record<string, unknown>\n readonly headers?: Record<string, unknown>\n readonly body?: unknown\n readonly successStatus: number\n readonly declaredStatuses: ReadonlyArray<number>\n readonly empty: boolean\n}\n\nexport function make(options: ClientOptions) {\n const fetch = options.fetch ?? globalThis.fetch\n\n const prepare = (descriptor: RequestDescriptor, requestOptions?: RequestOptions) => {\n const url = new URL(descriptor.path, options.baseUrl)\n for (const [key, value] of Object.entries(descriptor.query ?? {})) appendQuery(url.searchParams, key, value)\n const headers = new Headers(options.headers)\n for (const [key, value] of Object.entries(descriptor.headers ?? {})) {\n if (value !== undefined && value !== null) headers.set(key, String(value))\n }\n for (const [key, value] of new Headers(requestOptions?.headers)) headers.set(key, value)\n if (descriptor.body !== undefined && !headers.has("content-type")) headers.set("content-type", "application/json")\n return {\n url,\n init: {\n method: descriptor.method,\n signal: requestOptions?.signal,\n headers,\n body: descriptor.body === undefined ? undefined : JSON.stringify(descriptor.body),\n } satisfies RequestInit,\n }\n }\n\n const execute = async (descriptor: RequestDescriptor, requestOptions?: RequestOptions) => {\n try {\n const prepared = prepare(descriptor, requestOptions)\n return await fetch(prepared.url, prepared.init)\n } catch (cause) {\n throw new ClientError("Transport", { cause })\n }\n }\n\n const responseError = async (response: Response, descriptor: RequestDescriptor): Promise<never> => {\n if (descriptor.declaredStatuses.includes(response.status)) throw await json(response)\n try {\n await response.body?.cancel()\n } catch {}\n throw new ClientError("UnexpectedStatus", { cause: { status: response.status } })\n }\n\n const request = async <A>(descriptor: RequestDescriptor, requestOptions?: RequestOptions): Promise<A> => {\n const response = await execute(descriptor, requestOptions)\n if (response.status !== descriptor.successStatus) return responseError(response, descriptor)\n if (descriptor.empty) {\n try {\n await response.body?.cancel()\n } catch {}\n return undefined as A\n }\n return await json(response) as A\n }\n\n const sse = <A>(descriptor: RequestDescriptor, requestOptions?: RequestOptions): AsyncIterable<A> => ({\n async *[Symbol.asyncIterator]() {\n const response = await execute(descriptor, requestOptions)\n if (response.status !== descriptor.successStatus) await responseError(response, descriptor)\n if (!isContentType(response, "text/event-stream")) {\n try {\n await response.body?.cancel()\n } catch {}\n throw new ClientError("UnsupportedContentType")\n }\n if (response.body === null) throw new ClientError("MalformedResponse")\n const reader = response.body.getReader()\n const decoder = new TextDecoder()\n let buffer = ""\n try {\n while (true) {\n let next: ReadableStreamReadResult<Uint8Array>\n try {\n next = await reader.read()\n } catch (cause) {\n throw new ClientError("Transport", { cause })\n }\n buffer += decoder.decode(next.value, { stream: !next.done })\n if (buffer.length > 1_048_576) throw new ClientError("MalformedResponse")\n const trailingCarriageReturn = !next.done && buffer.endsWith("\\r")\n if (trailingCarriageReturn) buffer = buffer.slice(0, -1)\n buffer = buffer.replaceAll("\\r\\n", "\\n").replaceAll("\\r", "\\n")\n if (trailingCarriageReturn) buffer += "\\r"\n if (next.done && buffer !== "") buffer += "\\n\\n"\n let boundary = buffer.indexOf("\\n\\n")\n while (boundary >= 0) {\n const block = buffer.slice(0, boundary)\n buffer = buffer.slice(boundary + 2)\n const data = block.split("\\n").flatMap((line) => line.startsWith("data:") ? [line.slice(5).trimStart()] : []).join("\\n")\n if (data !== "") {\n try {\n yield JSON.parse(data) as A\n } catch (cause) {\n throw new ClientError("MalformedResponse", { cause })\n }\n }\n boundary = buffer.indexOf("\\n\\n")\n }\n if (next.done) return\n }\n } finally {\n try {\n await reader.cancel()\n } catch {}\n reader.releaseLock()\n }\n },\n })\n\n return { ${fields.join(", ")} }\n}\n\nfunction appendQuery(params: URLSearchParams, key: string, value: unknown): void {\n if (value === undefined) return\n if (value === null) {\n params.append(key, "null")\n return\n }\n if (Array.isArray(value)) {\n for (const item of value) appendQuery(params, key, item)\n return\n }\n if (typeof value === "object") {\n for (const [child, item] of Object.entries(value)) appendQuery(params, \`\${key}[\${child}]\`, item)\n return\n }\n params.append(key, String(value))\n}\n\nasync function json(response: Response): Promise<unknown> {\n if (!isContentType(response, "application/json") && !response.headers.get("content-type")?.includes("+json")) {\n try {\n await response.body?.cancel()\n } catch {}\n throw new ClientError("UnsupportedContentType")\n }\n let text: string\n try {\n text = await response.text()\n } catch (cause) {\n throw new ClientError("Transport", { cause })\n }\n if (text === "") throw new ClientError("MalformedResponse")\n try {\n return JSON.parse(text)\n } catch (cause) {\n throw new ClientError("MalformedResponse", { cause })\n }\n}\n\nfunction isContentType(response: Response, expected: string) {\n return response.headers.get("content-type")?.split(";", 1)[0]?.trim().toLowerCase() === expected\n}\n`
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