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@hemia/workflow-node-validator

v0.0.2

Published

Nodo de validación para Hemia Workflow: evalúa reglas declarativas con JEXL.

Readme

@hemia/workflow-node-validator

Nodo de validación para Hemia Workflow. Evalúa reglas declarativas (JEXL) contra las variables del contexto (variables).

Instalación

npm install @hemia/workflow-node-validator

Uso

import { NodeRegistry } from '@hemia/workflow-engine';
import { validatorNode } from '@hemia/workflow-node-validator';

const registry = new NodeRegistry();
registry.register('validator', validatorNode);

En tu workflow:

{
  "id": "vacation-request-flow",
  "name": "Solicitud de Vacaciones",
  "steps": [
    {
      "id": "validateInput",
      "type": "validator",
      "params": {
        "rules": [
          "input.startDate < input.endDate",
          "input.employeeId != null",
          "input.email != null"
        ]
      },
      "next": [{ "id": "checkVacationBalance" }]
    }
  ]
}

Parámetros

  • rules: string[] Reglas JEXL; si alguna falla, el nodo falla.
  • allMustPass?: boolean (default true). Si false, basta que una pase para éxito.
  • failCode?: string Código de error personalizado.

Ejemplos adicionales

1) Validar con allMustPass = false (con que una pase es suficiente)

{
  "id": "validateAny",
  "type": "validator",
  "params": {
    "allMustPass": false,
    "rules": [
      "input.managerApproved == true",
      "input.hrApproved == true"
    ]
  },
  "next": [{ "id": "continue" }]
}

2) Personalizar el código de error (failCode)

{
  "id": "validateInput",
  "type": "validator",
  "params": {
    "failCode": "INPUT_INVALID",
    "rules": [
      "input.requestedDays > 0",
      "input.employeeId != null"
    ]
  },
  "error": { "next": "handleError" }
}

3) Usar la salida del validator en condiciones posteriores

El engine guarda la salida en variables.output_<stepId>. Puedes usarla en next.condition:

{
  "id": "validateInput",
  "type": "validator",
  "params": { "rules": ["input.requestedDays > 0"] },
  "next": [{ "id": "callApi", "condition": "output_validateInput.passed == true" }]
}

4) Transforms JEXL en reglas

Si registras transforms globales en @hemia/workflow-core, puedes usarlos dentro de las reglas:

import { registerJexlTransforms } from "@hemia/workflow-core";
registerJexlTransforms({ toLower: (s: any) => (s ?? "").toString().toLowerCase() });

Regla de ejemplo:

{
  "id": "validateDept",
  "type": "validator",
  "params": {
    "rules": ["(input.department | toLower) == 'hr'"]
  }
}

Notas:

  • Si allMustPass es true, el nodo falla en la primera regla no cumplida.
  • Con allMustPass en false, si ninguna regla pasa, el nodo falla.
  • El error incluye detalles de la regla que falló (details).