private buildHeaders()

in core.ts [428:466]
30 lines of code
6 McCabe index (conditional complexity)

  private buildHeaders({
    options,
    headers,
    contentLength,
    retryCount,
  }: {
    options: FinalRequestOptions;
    headers: Record<string, string | null | undefined>;
    contentLength: string | null | undefined;
    retryCount: number;
  }): Record<string, string> {
    const reqHeaders: Record<string, string> = {};
    if (contentLength) {
      reqHeaders["content-length"] = contentLength;
    }

    const defaultHeaders = this.defaultHeaders(options);
    applyHeadersMut(reqHeaders, defaultHeaders);
    applyHeadersMut(reqHeaders, headers);

    // let builtin fetch set the Content-Type for multipart bodies
    if (isMultipartBody(options.body) && shimsKind !== "node") {
      delete reqHeaders["content-type"];
    }

    // Don't set the retry count header if it was already set or removed through default headers or by the
    // caller. We check `defaultHeaders` and `headers`, which can contain nulls, instead of `reqHeaders` to
    // account for the removal case.
    if (
      getHeader(defaultHeaders, "x-stainless-retry-count") === undefined &&
      getHeader(headers, "x-stainless-retry-count") === undefined
    ) {
      reqHeaders["x-stainless-retry-count"] = String(retryCount);
    }

    this.validateHeaders(reqHeaders, headers);

    return reqHeaders;
  }