lib/service.js
function getSignerClass() {
    var version;
    if (this.config.signatureVersion) {
      version = this.config.signatureVersion;
    } else {
      version = this.api.signatureVersion;
    }
    return AWS.Signers.RequestSigner.getVersion(version);
  }
function getSignerClass() {
    var version;
    if (this.config.signatureVersion) {
      version = this.config.signatureVersion;
    } else {
      version = this.api.signatureVersion;
    }
    return AWS.Signers.RequestSigner.getVersion(version);
  }
Gets the signer class for a given request
@api private