Method resolveValue

packages/graph/src/Steps.ts:6564–6594

(
    path: TraversalPath<any, any, any>,
    value: SetAssignmentValue,
    context?: QueryContext,
  )

  }

  protected resolveValue(
    path: TraversalPath<any, any, any>,
    value: SetAssignmentValue,
    context?: QueryContext,
  ): any {
    if (value.type === "literal") {
      return value.value;
    } else if (value.type === "property") {
      const sourcePath = path.get(value.variable);
      if (!sourcePath) {
        throw new Error(`MERGE: Source variable '${value.variable}' not found`);
      }
      const sourceElement = sourcePath.value;
      if (sourceElement instanceof Vertex || sourceElement instanceof Edge) {
        return sourceElement.get(value.property as never);
      }
      throw new Error(`MERGE: Source variable '${value.variable}' is not a vertex or edge`);
    } else if (value.type === "variable") {
      const sourcePath = path.get(value.variable);
      if (!sourcePath) {
        throw new Error(`MERGE: Source variable '${value.variable}' not found`);
      }
      return sourcePath.value;
    } else if (value.type === "parameter") {
      const params = context?.params ?? getQueryParams();
      return params[value.name];
    } else if (value.type === "list") {
      return value.values;
    }
    return undefined;
  }

  public override clone(partial?: Partial<MergeStepConfig>) {
    return new MergeStep({