@h4ad/serverless-adapter/lib/frameworks/trpc/index.cjs.map

Run REST APIs and other web applications using your existing Node.js application framework (NestJS, Express, Koa, Hapi, Fastify and many others), on top of AWS, Azure, Digital Ocean and many other clouds.

{"version":3,"sources":["../../../src/frameworks/trpc/index.ts","../../../src/frameworks/trpc/trpc.framework.ts","../../../src/network/request.ts","../../../src/network/response.ts","../../../src/network/utils.ts","../../../src/network/response-stream.ts","../../../src/core/headers.ts","../../../src/core/no-op.ts","../../../src/core/logger.ts","../../../src/core/optional.ts","../../../src/core/stream.ts"],"sourcesContent":["export * from './trpc.framework';\n","//#region\n\nimport type { IncomingMessage, ServerResponse } from 'http';\nimport type { AnyRouter, DataTransformer } from '@trpc/server';\nimport {\n  type NodeHTTPCreateContextFn,\n  type NodeHTTPCreateContextFnOptions,\n  type NodeHTTPHandlerOptions,\n  nodeHTTPRequestHandler,\n} from '@trpc/server/adapters/node-http';\nimport type { SingleValueHeaders } from '../../@types';\nimport type { FrameworkContract } from '../../contracts';\nimport { getDefaultIfUndefined, getFlattenedHeadersMap } from '../../core';\n\n//#endregion\n\n/**\n * The transformer that is responsible to transform buffer's input to javascript objects\n *\n * @deprecated You should use {@link JsonBodyParserFramework} instead, is more reliable and enable you to use transformer of trpc to other things.\n * @breadcrumb Frameworks / TrpcFramework\n * @public\n */\nexport class BufferToJSObjectTransformer implements DataTransformer {\n  /**\n   * Deserialize unknown values to javascript objects\n   *\n   * @param value - The value to be deserialized\n   */\n  public deserialize(value?: unknown): any {\n    if (value instanceof Buffer) return JSON.parse(value.toString('utf-8'));\n\n    return value;\n  }\n\n  /**\n   * The value to be serialized, do nothing because tRPC can handle.\n   *\n   * @param value - The value to be serialized\n   */\n  public serialize(value: any): any {\n    return value;\n  }\n}\n\n/**\n * The context created by this library that allows getting some information from the request and setting the status and header of the response.\n *\n * @breadcrumb Frameworks / TrpcFramework\n * @public\n */\nexport interface TrpcAdapterBaseContext {\n  /**\n   * The request object that will be forward to your app\n   */\n  request: IncomingMessage;\n\n  /**\n   * The response object that will be forward to your app to output the response\n   */\n  response: ServerResponse;\n\n  /**\n   * The method to set response status.\n   *\n   * @param statusCode - The response status that you want\n   */\n  setStatus(statusCode: number): void;\n\n  /**\n   * The method to set some header in the response\n   *\n   * @param name - The name of the header\n   * @param value - The value to be set in the header\n   */\n  setHeader(name: string, value: number | string): void;\n\n  /**\n   * The method to remove some header from the response\n   *\n   * @param name - The name of the header\n   */\n  removeHeader(name: string): void;\n\n  /**\n   * The method to return the value of some header from the request\n   *\n   * @param name - The name of the header\n   */\n  getHeader(name: string): string | undefined;\n\n  /**\n   * The method to return the request headers\n   */\n  getHeaders(): SingleValueHeaders;\n\n  /**\n   * The method to return user's address\n   */\n  getIp(): string | undefined;\n\n  /**\n   * The method to return the URL called\n   */\n  getUrl(): string | undefined;\n\n  /**\n   * The method to return the HTTP Method in the request\n   */\n  getMethod(): string | undefined;\n}\n\n/**\n * This is the context merged between {@link TrpcAdapterBaseContext} and the {@link TContext} that you provided.\n *\n * This context will be merged with the context you created with `createContext` inside {@link TrpcFrameworkOptions}.\n * So to make the type work, just send the properties you've added inside {@link TContext}.\n *\n * @example\n * ```typescript\n * type MyCustomContext = { user: { name: string } };\n * type TrpcContext = TrpcAdapterContext<MyCustomContext>; // your final context type to put inside trpc.router\n * ```\n *\n * @breadcrumb Frameworks / TrpcFramework\n * @public\n */\nexport type TrpcAdapterContext<TContext> = TContext & TrpcAdapterBaseContext;\n\n/**\n * The options to customize the {@link TrpcFramework}\n *\n * @breadcrumb Frameworks / TrpcFramework\n * @public\n */\nexport type TrpcFrameworkOptions<TContext> = Omit<\n  NodeHTTPHandlerOptions<AnyRouter, IncomingMessage, ServerResponse>,\n  'router' | 'createContext'\n> & {\n  createContext?: (\n    opts: NodeHTTPCreateContextFnOptions<IncomingMessage, ServerResponse>,\n  ) =>\n    | Omit<TContext, keyof TrpcAdapterBaseContext>\n    | Promise<Omit<TContext, keyof TrpcAdapterBaseContext>>;\n};\n\n/**\n * The framework that forwards requests to TRPC handler\n *\n * @breadcrumb Frameworks / TrpcFramework\n * @public\n */\nexport class TrpcFramework<\n  TContext extends TrpcAdapterBaseContext,\n  TRouter extends AnyRouter = AnyRouter,\n> implements FrameworkContract<TRouter>\n{\n  //#region Constructor\n\n  /**\n   * Default constructor\n   */\n  constructor(protected readonly options?: TrpcFrameworkOptions<TContext>) {}\n\n  //#endregion\n\n  //#region Public Methods\n\n  /**\n   * {@inheritDoc}\n   */\n  public sendRequest<TRouter extends AnyRouter>(\n    app: TRouter,\n    request: IncomingMessage,\n    response: ServerResponse,\n  ): void {\n    const endpoint = this.getSafeUrlForTrpc(request);\n\n    nodeHTTPRequestHandler({\n      req: request,\n      res: response,\n      path: endpoint,\n      router: app,\n      ...this.options,\n      createContext: createContextOptions =>\n        this.mergeDefaultContextWithOptionsContext(createContextOptions),\n    });\n  }\n\n  //#endregion\n\n  //#region Protected Methods\n\n  /**\n   * Get safe url that can be used inside Trpc.\n   *\n   * @example\n   * ```typescript\n   * const url = getSafeUrlForTrpc('/users?input=hello');\n   * console.log(url); // users\n   * ```\n   *\n   * @param request - The request object that will be forward to your app\n   */\n  protected getSafeUrlForTrpc(request: IncomingMessage): string {\n    let url = request.url!;\n\n    if (url.startsWith('/')) url = url.slice(1);\n\n    if (url.includes('?')) url = url.split('?')[0];\n\n    return url;\n  }\n\n  /**\n   * Merge the default context ({@link TrpcAdapterContext}) with the context created by the user.\n   *\n   * @param createContextOptions - The options sent by trpc to create the context\n   */\n  protected mergeDefaultContextWithOptionsContext(\n    createContextOptions: NodeHTTPCreateContextFnOptions<\n      IncomingMessage,\n      ServerResponse\n    >,\n  ): TContext | Promise<TContext> {\n    const createContextFromOptions: NodeHTTPCreateContextFn<\n      AnyRouter,\n      IncomingMessage,\n      ServerResponse\n    > = getDefaultIfUndefined(\n      this.options?.createContext,\n      () =>\n        undefined as unknown as Omit<TContext, keyof TrpcAdapterBaseContext>,\n    );\n\n    const resolvedContext = createContextFromOptions(createContextOptions);\n\n    if (resolvedContext && resolvedContext.then) {\n      return resolvedContext.then(context =>\n        this.wrapResolvedContextWithDefaultContext(\n          context,\n          createContextOptions,\n        ),\n      );\n    }\n\n    return this.wrapResolvedContextWithDefaultContext(\n      resolvedContext,\n      createContextOptions,\n    );\n  }\n\n  /**\n   * Wraps the resolved context from the {@link TrpcFrameworkOptions} created with `createContext` and merge\n   * with the {@link TrpcAdapterContext} generated by the library.\n   *\n   * @param resolvedContext - The context created with `createContext` inside {@link TrpcFrameworkOptions}\n   * @param createContextOptions - The options sent by trpc to create the context\n   */\n  protected wrapResolvedContextWithDefaultContext(\n    resolvedContext: TContext,\n    createContextOptions: NodeHTTPCreateContextFnOptions<\n      IncomingMessage,\n      ServerResponse\n    >,\n  ): TContext {\n    const request = createContextOptions.req;\n    const response = createContextOptions.res;\n\n    return {\n      ...resolvedContext,\n      request,\n      response,\n      getUrl: () => request.url,\n      getMethod: () => request.method,\n      getHeaders: () => getFlattenedHeadersMap(request.headers, ',', true),\n      setHeader: (header, value) => {\n        response.setHeader(header, value);\n      },\n      removeHeader: header => {\n        response.removeHeader(header);\n      },\n      getHeader: (header: string) => {\n        return getFlattenedHeadersMap(request.headers, ',', true)[\n          header.toLowerCase()\n        ];\n      },\n      setStatus: (statusCode: number) => {\n        response.statusCode = statusCode;\n        // force undefined to get default message for the status code\n        // ref: https://nodejs.org/dist/latest-v16.x/docs/api/http.html#responsestatusmessage\n        response.statusMessage = undefined as any;\n      },\n      getIp: () => request.connection.remoteAddress,\n    };\n  }\n\n  //#endregion\n}\n","// ATTRIBUTION: https://github.com/dougmoscrop/serverless-http\nimport { IncomingMessage } from 'node:http';\nimport type { AddressInfo } from 'node:net';\nimport type { SingleValueHeaders } from '../@types';\nimport { NO_OP } from '../core';\n\nconst HTTPS_PORT = 443;\n\n/**\n * The properties to create a {@link ServerlessRequest}\n *\n * @breadcrumb Network / ServerlessRequest\n * @public\n */\nexport interface ServerlessRequestProps {\n  /**\n   * The HTTP Method of the request\n   */\n  method: string;\n\n  /**\n   * The URL requested\n   */\n  url: string;\n\n  /**\n   * The headers from the event source\n   */\n  headers: SingleValueHeaders;\n\n  /**\n   * The body from the event source\n   */\n  body?: Buffer | Uint8Array;\n\n  /**\n   * The IP Address from caller\n   */\n  remoteAddress?: string;\n}\n\n/**\n * The class that represents an {@link http#IncomingMessage} created by the library to represent an actual request to the framework.\n *\n * @breadcrumb Network / ServerlessRequest\n * @public\n */\nexport class ServerlessRequest extends IncomingMessage {\n  constructor({\n    method,\n    url,\n    headers,\n    body,\n    remoteAddress,\n  }: ServerlessRequestProps) {\n    super({\n      encrypted: true,\n      readable: true, // credits to @pnkp at https://github.com/CodeGenieApp/serverless-express/pull/692\n      remoteAddress,\n      address: () => ({ port: HTTPS_PORT }) as AddressInfo,\n      on: NO_OP,\n      removeListener: NO_OP,\n      removeEventListener: NO_OP,\n      end: NO_OP,\n      destroy: NO_OP,\n    } as any);\n\n    this.statusCode = 200;\n    this.statusMessage = 'OK';\n    this.complete = true;\n    this.httpVersion = '1.1';\n    this.httpVersionMajor = 1;\n    this.httpVersionMinor = 1;\n    this.method = method;\n    this.headers = headers;\n    this.body = body;\n    this.url = url;\n    this.ip = remoteAddress;\n\n    this._read = () => {\n      this.push(body);\n      this.push(null);\n    };\n  }\n\n  ip?: string;\n  body?: Buffer | Uint8Array;\n}\n","// ATTRIBUTION: https://github.com/dougmoscrop/serverless-http\nimport { IncomingMessage, ServerResponse } from 'node:http';\nimport type { Socket } from 'node:net';\nimport { NO_OP } from '../core';\nimport { getString } from './utils';\n\nconst headerEnd = '\\r\\n\\r\\n';\nconst endChunked = '0\\r\\n\\r\\n';\n\nconst BODY = Symbol('Response body');\nconst HEADERS = Symbol('Response headers');\n\nfunction addData(stream: ServerlessResponse, data: Uint8Array | string) {\n  if (\n    Buffer.isBuffer(data) ||\n    typeof data === 'string' ||\n    data instanceof Uint8Array\n  )\n    stream[BODY].push(Buffer.from(data));\n  else throw new Error(`response.write() of unexpected type: ${typeof data}`);\n}\n\n/**\n * The properties to create a {@link ServerlessResponse}.\n *\n * @breadcrumb Network / ServerlessResponse\n * @public\n */\nexport interface ServerlessResponseProps {\n  /**\n   * The HTTP Method from request\n   */\n  method?: string;\n}\n\n/**\n * The class that represents a response instance used to send to the framework and wait until the framework finishes processing the request.\n * Once it's happens, we use the properties from this response to built the response to the cloud.\n *\n * @breadcrumb Network / ServerlessResponse\n * @public\n */\nexport class ServerlessResponse extends ServerResponse {\n  constructor({ method }: ServerlessResponseProps) {\n    super({ method } as any);\n\n    this[BODY] = [];\n    this[HEADERS] = {};\n\n    this.useChunkedEncodingByDefault = false;\n    this.chunkedEncoding = false;\n    this._header = '';\n\n    // this ignore is used because I need to ignore these write calls:\n    // https://github.com/nodejs/node/blob/main/lib/_http_outgoing.js#L934-L935\n    // https://github.com/nodejs/node/blob/main/lib/_http_outgoing.js#L937\n    let writesToIgnore = 1;\n\n    const socket: Partial<Socket> & { _writableState: any } = {\n      _writableState: {},\n      writable: true,\n      on: NO_OP,\n      removeListener: NO_OP,\n      destroy: NO_OP,\n      cork: NO_OP,\n      uncork: NO_OP,\n      write: (\n        data: Uint8Array | string,\n        encoding?: string | null | (() => void),\n        cb?: () => void,\n      ): any => {\n        if (typeof encoding === 'function') {\n          cb = encoding;\n          encoding = null;\n        }\n\n        if (this._header === '' || this._wroteHeader) {\n          if (!this.chunkedEncoding) addData(this, data);\n          else {\n            if (writesToIgnore > 0) writesToIgnore--;\n            else if (data !== endChunked) {\n              addData(this, data);\n              writesToIgnore = 3;\n            }\n          }\n        } else {\n          const string = getString(data);\n          const index = string.indexOf(headerEnd);\n\n          if (index !== -1) {\n            const remainder = string.slice(index + headerEnd.length);\n\n            if (remainder && !this.chunkedEncoding) addData(this, remainder);\n\n            this._wroteHeader = true;\n          }\n        }\n\n        if (typeof cb === 'function') cb();\n      },\n    };\n\n    this.assignSocket(socket as unknown as Socket);\n  }\n\n  _header: string;\n  _headers?: Record<any, any>;\n  _wroteHeader?: boolean;\n\n  [BODY]: any[];\n  [HEADERS]: Record<any, any>;\n\n  get headers(): Record<any, any> {\n    return this[HEADERS];\n  }\n\n  static from(res: IncomingMessage) {\n    const response = new ServerlessResponse({ method: res.method });\n\n    response.statusCode = res.statusCode || 0;\n    response[HEADERS] = res.headers;\n    response[BODY] = (res as any).body ? [Buffer.from((res as any).body)] : [];\n    response.end();\n\n    return response;\n  }\n\n  static body(res: ServerlessResponse): Buffer {\n    return Buffer.concat(res[BODY]);\n  }\n\n  static headers(res: ServerlessResponse) {\n    const headers = res.getHeaders();\n\n    return Object.assign(headers, res[HEADERS]);\n  }\n\n  override setHeader(\n    key: string,\n    value: number | string | readonly string[],\n  ): any {\n    if (this._wroteHeader) this[HEADERS][key] = value;\n    else super.setHeader(key, value);\n  }\n\n  override writeHead(\n    statusCode: number,\n    statusMessage?: string | any | any[],\n    obj?: any | any[],\n  ): any {\n    const headersObjOrArray =\n      typeof statusMessage === 'string' ? obj : statusMessage;\n\n    const arrayHeaders = Array.isArray(headersObjOrArray)\n      ? headersObjOrArray\n      : [headersObjOrArray || {}];\n\n    for (const headers of arrayHeaders) {\n      for (const name in headers) {\n        this.setHeader(name, headers[name]!);\n\n        if (!this._wroteHeader) {\n          // we only need to initiate super.headers once\n          // writeHead will add the other headers itself\n          break;\n        }\n      }\n    }\n\n    return this.callNativeWriteHead(statusCode, statusMessage, obj);\n  }\n\n  /**\n   * I use ignore here because in nodejs 12.x, statusMessage can be string | OutgoingHttpHeaders\n   * But in nodejs \\>=14.x, statusMessage can also be OutgoingHttpHeaders[]\n   * I take care of these cases above, but here I can't handle it well, so I give up\n   * nodejs 12.x ref: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/v12/http.d.ts#L229\n   * nodejs 14.x ref: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/node/v14/http.d.ts#L263\n   */\n  protected callNativeWriteHead(\n    statusCode: number,\n    statusMessage?: string | any | any[],\n    obj?: any | any[],\n  ): this {\n    return super.writeHead(statusCode, statusMessage, obj);\n  }\n}\n","/**\n * Get the data from a buffer, string, or Uint8Array\n *\n * @breadcrumb Network\n * @param data - The data that was written inside the stream\n */\nexport function getString(data: Buffer | string | unknown) {\n  if (Buffer.isBuffer(data)) return data.toString('utf8');\n  else if (typeof data === 'string') return data;\n  else if (data instanceof Uint8Array) return new TextDecoder().decode(data);\n  else throw new Error(`response.write() of unexpected type: ${typeof data}`);\n}\n","import { ServerResponse } from 'node:http';\nimport type { Socket } from 'node:net';\nimport type { Writable } from 'node:stream';\nimport type { BothValueHeaders } from '../@types';\nimport { type ILogger, NO_OP, parseHeaders } from '../core';\nimport { getString } from './utils';\n\n// header or data crlf\nconst crlfBuffer = Buffer.from('\\r\\n');\n\nconst endChunked = '0\\r\\n\\r\\n';\nconst headerEnd = '\\r\\n\\r\\n';\nconst endStatusSeparator = '\\r\\n';\n\n/**\n * The properties to create a {@link ServerlessStreamResponse}.\n *\n * @breadcrumb Network / ServerlessStreamResponse\n * @public\n */\nexport interface ServerlessStreamResponseProps {\n  /**\n   * The HTTP Method from request\n   */\n  method?: string;\n\n  /**\n   * The callback to receive the headers when they are written to the stream\n   * You need to return a writable stream be able to continue writing the response\n   *\n   * @param statusCode - The status code of the response\n   * @param headers - The headers of the response\n   */\n  onReceiveHeaders: (statusCode: number, headers: BothValueHeaders) => Writable;\n\n  /**\n   * Instance of the logger\n   */\n  log: ILogger;\n}\n\n/**\n * The class that represents a response instance used to send to the framework and wait until the framework finishes processing the request.\n * This response is specially built to deal with transfer-encoding: chunked\n *\n * @breadcrumb Network / ServerlessStreamResponse\n * @public\n */\nexport class ServerlessStreamResponse extends ServerResponse {\n  constructor({\n    method,\n    onReceiveHeaders,\n    log,\n  }: ServerlessStreamResponseProps) {\n    super({ method } as any);\n\n    this.useChunkedEncodingByDefault = true;\n    this.chunkedEncoding = true;\n\n    let internalWritable: Writable | null = null;\n    let firstCrlfBufferEncountered = false;\n    let chunkEncountered = false;\n\n    const socket: Partial<Socket> & { _writableState: any } = {\n      _writableState: {},\n      writable: true,\n      on: NO_OP,\n      removeListener: NO_OP,\n      destroy: NO_OP,\n      cork: NO_OP,\n      uncork: NO_OP,\n      write: (\n        data: Uint8Array | string,\n        encoding?: string | null | (() => void),\n        cb?: () => void,\n      ): any => {\n        // very unlikely, I don't even know how to reproduce this, but exist on types\n        // istanbul ignore if\n        if (typeof encoding === 'function') {\n          cb = encoding;\n          encoding = null;\n        }\n\n        log.debug('SERVERLESS_ADAPTER:RESPONSE_STREAM:DATA', () => ({\n          data: Buffer.isBuffer(data) ? data.toString('utf8') : data,\n          encoding,\n        }));\n\n        if (!internalWritable) {\n          const stringData = getString(data);\n          const endStatusIndex = stringData.indexOf(endStatusSeparator);\n          const status = +stringData.slice(0, endStatusIndex).split(' ')[1];\n          const endHeaderIndex = stringData.indexOf(headerEnd);\n\n          const headerData = stringData.slice(\n            endStatusIndex + 2,\n            endHeaderIndex,\n          );\n          const headers = parseHeaders(headerData);\n          log.debug(\n            'SERVERLESS_ADAPTER:RESPONSE_STREAM:FRAMEWORK_HEADERS',\n            () => ({\n              headers,\n            }),\n          );\n\n          internalWritable = onReceiveHeaders(status, headers);\n\n          // If we get an endChunked right after header which means the response body is empty, we need to immediately end the writable\n          if (stringData.substring(endHeaderIndex + 4) === endChunked)\n            internalWritable.end();\n\n          return true;\n        }\n\n        // node sends the last chunk crlf as a string:\n        // https://github.com/nodejs/node/blob/v22.8.0/lib/_http_outgoing.js#L1131\n        if (data === endChunked) {\n          internalWritable.end(cb);\n          return true;\n        }\n\n        // check for header or data crlf\n        // node sends the header and data crlf as a buffer\n        // below code is aligned to following node implementation of the HTTP/1.1 chunked transfer coding:\n        // https://github.com/nodejs/node/blob/v22.8.0/lib/_http_outgoing.js#L1012-L1015\n        // for reference: https://datatracker.ietf.org/doc/html/rfc9112#section-7\n        if (Buffer.isBuffer(data) && crlfBuffer.equals(data)) {\n          const isHeaderCrlf = !firstCrlfBufferEncountered;\n          if (isHeaderCrlf) {\n            firstCrlfBufferEncountered = true;\n            return true;\n          }\n\n          const isDataCrlf = firstCrlfBufferEncountered && chunkEncountered;\n          if (isDataCrlf) {\n            // done with chunk\n            firstCrlfBufferEncountered = false;\n            chunkEncountered = false;\n            return true;\n          }\n\n          // the crlf *is* the chunk\n        }\n\n        const isContentLength = !firstCrlfBufferEncountered;\n        if (isContentLength) {\n          // discard content length\n          return true;\n        }\n\n        // write chunk\n        chunkEncountered = true;\n        internalWritable.write(data, cb);\n        return true;\n      },\n    };\n\n    this.assignSocket(socket as unknown as Socket);\n  }\n}\n","//#region Imports\n\nimport type { BothValueHeaders } from '../@types';\n\n//#endregion\n\n/**\n * Transform a header map and make sure the value is not an array\n *\n * @example\n * ```typescript\n * const headers = { 'accept-encoding': 'gzip', 'accept-language': ['en-US', 'en;q=0.9'] };\n * const flattenedHeaders = getFlattenedHeadersMap(headers, ',', true);\n * console.log(flattenedHeaders);\n * // { 'accept-encoding': 'gzip', 'accept-language': 'en-US,en;q=0.9' }\n * ```\n *\n * @param headersMap - The initial headers\n * @param separator - The separator used when we join the array of header's value\n * @param lowerCaseKey - Should put all keys in lowercase\n *\n * @breadcrumb Core / Headers\n * @public\n */\nexport function getFlattenedHeadersMap(\n  headersMap: BothValueHeaders,\n  separator: string = ',',\n  lowerCaseKey: boolean = false,\n): Record<string, string> {\n  return Object.keys(headersMap).reduce((acc, headerKey) => {\n    const newKey = lowerCaseKey ? headerKey.toLowerCase() : headerKey;\n    const headerValue = headersMap[headerKey];\n\n    if (Array.isArray(headerValue)) acc[newKey] = headerValue.join(separator);\n    else acc[newKey] = (headerValue ?? '') + '';\n\n    return acc;\n  }, {});\n}\n\n/**\n * Transforms a header map into a multi-value map header.\n *\n * @example\n * ```typescript\n * const headers = { 'accept-encoding': 'gzip', 'connection': ['keep-alive'] };\n * const multiValueHeaders = getMultiValueHeadersMap(headers);\n * console.log(multiValueHeaders);\n * // { 'accept-encoding': ['gzip'], 'connection': ['keep-alive'] }\n * ```\n *\n * @param headersMap - The initial headers\n *\n * @breadcrumb Core / Headers\n * @public\n */\nexport function getMultiValueHeadersMap(\n  headersMap: BothValueHeaders,\n): Record<string, string[]> {\n  return Object.keys(headersMap).reduce((acc, headerKey) => {\n    const headerValue = headersMap[headerKey];\n\n    acc[headerKey.toLowerCase()] = Array.isArray(headerValue)\n      ? headerValue.map(String)\n      : [String(headerValue)];\n\n    return acc;\n  }, {});\n}\n\n/**\n * The wrapper that holds the information about single value headers and cookies\n *\n * @breadcrumb Core / Headers\n * @public\n */\nexport type FlattenedHeadersAndCookies = {\n  /**\n   * Just the single value headers\n   */\n  headers: Record<string, string>;\n\n  /**\n   * The list of cookies\n   */\n  cookies: string[];\n};\n\n/**\n * Transforms a header map into a single value headers and cookies\n *\n * @param headersMap - The initial headers\n *\n * @breadcrumb Core / Headers\n * @public\n */\nexport function getFlattenedHeadersMapAndCookies(\n  headersMap: BothValueHeaders,\n): FlattenedHeadersAndCookies {\n  return Object.keys(headersMap).reduce(\n    (acc, headerKey) => {\n      const headerValue = headersMap[headerKey];\n      const lowerHeaderKey = headerKey.toLowerCase();\n\n      if (Array.isArray(headerValue)) {\n        if (lowerHeaderKey !== 'set-cookie')\n          acc.headers[headerKey] = headerValue.join(',');\n        else acc.cookies.push(...headerValue);\n      } else {\n        if (lowerHeaderKey === 'set-cookie' && headerValue !== undefined)\n          acc.cookies.push(headerValue ?? '');\n        else acc.headers[headerKey] = String(headerValue ?? '');\n      }\n\n      return acc;\n    },\n    {\n      cookies: [],\n      headers: {},\n    } as FlattenedHeadersAndCookies,\n  );\n}\n\n/**\n * Parse HTTP Raw Headers\n * Attribution to {@link https://github.com/kesla/parse-headers/blob/master/parse-headers.js}\n *\n * @param headers - The raw headers\n *\n * @breadcrumb Core / Headers\n * @public\n */\nexport function parseHeaders(\n  headers: string,\n): Record<string, string | string[]> {\n  if (!headers) return {};\n\n  const result = {};\n  const headersArr = headers.trim().split('\\n');\n\n  for (let i = 0; i < headersArr.length; i++) {\n    const row = headersArr[i];\n    const index = row.indexOf(':');\n    const key = row.slice(0, index).trim().toLowerCase();\n    const value = row.slice(index + 1).trim();\n\n    if (typeof result[key] === 'undefined') result[key] = value;\n    else if (Array.isArray(result[key])) result[key].push(value);\n    else result[key] = [result[key], value];\n  }\n\n  return result;\n}\n\nexport 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