new BaseStep(type:
  | "agent"
  | "llm"
  | "retriever"
  | "tool"
  | "workflow"
  | "control"
  | "trace"
  | "session", data: BaseStepOptions): BaseStep;

createdAt: Date;

optional datasetInput: string;

optional datasetMetadata: Record<string, string> = {};

optional datasetOutput: string;

optional externalId: string;

id: string;

optional input: StepAllowedInputType;

metrics: Metrics;

name: string = "";

optional output: StepAllowedOutputType;

optional redactedInput: StepAllowedInputType;

optional redactedOutput: StepAllowedOutputType;

optional statusCode: number;

optional stepNumber: number;

optional tags: string[];

type:
  | "agent"
  | "llm"
  | "retriever"
  | "tool"
  | "workflow"
  | "control"
  | "trace"
  | "session";

userMetadata: Record<string, string> = {};

toJSON(): SerializedStep;

validateInputOutputSerializable<T>(val: T): T;