Serviz-JS

Command object Interface for JavaScript, a port of the Ruby gem Serviz.

Serviz-JS provides a minimal interface to unify and homogenize your Service or Command objects in your JavaScript applications. It works in both Node.js and browser environments.

Installation

npm install serviz

Usage

• Your class should extend from Serviz
• Your class should implement a call() method
• Return the result via this.result = value
• Add errors via this.errors.push('error message')
• Check the status via the provided success() or failure() methods

Example

First, you should create a Service class:

import { Serviz } from 'serviz'

class RegisterUser extends Serviz {
  constructor(user) {
    super()
    this.user = user
  }

  call() {
    if (this.user && this.user.email) {
      // Simulate user registration
      this.result = {
        id: Math.random().toString(36),
        ...this.user,
        registeredAt: new Date()
      }
    } else {
      this.errors.push('Invalid user data')
    }
  }
}

Now, you can run it by using the call method:

const operation = RegisterUser.call({ name: 'John', email: 'john@example.com' })

if (operation.success()) {
  const user = operation.result
  console.log(`Success! ${user.name} registered!`)
} else {
  console.log(`Error! ${operation.errorMessages()}`)
}

As you can see in the example above, you can use the success() method to check if your operation succeeded. You can also use the ok() alias.

In case you want to check if the operation failed, you can use the failure() method (or the alias error()):

if (operation.failure()) {
  console.log("Error! Please try again...")
  return
}

Callback style

You may like to use the callback style by passing a callback function as the last argument to call:

RegisterUser.call(user, (operation) => {
  if (operation.ok()) console.log("Success!")
})

Workflows

Serviz-JS also provides a ServizWorkflow class that allows you to compose multiple service objects together using a clean, declarative API for orchestrating complex multi-step operations.

Basic Workflow Usage

import { ServizWorkflow } from 'serviz'

class UserOnboarding extends ServizWorkflow {}

UserOnboarding.step(ValidateUser)
UserOnboarding.step(RegisterUser, { 
  if: (lastStep) => lastStep && lastStep.success()
})
UserOnboarding.step(SendWelcomeEmail, { 
  params: (instance) => instance._lastStep.result,
  if: (lastStep) => lastStep && lastStep.success()
})

// Usage
const operation = UserOnboarding.call({
  name: 'John Doe',
  email: 'john@example.com'
})

console.log(operation.success()) // => true
console.log(operation.result)    // => result from SendWelcomeEmail

// Handles failures gracefully
const failedOperation = UserOnboarding.call({
  name: 'Jane Doe'
  // Missing email
})

console.log(failedOperation.failure()) // => true
console.log(failedOperation.errors)    // => ["Email is required"]

Workflow Features

• Conditional execution using the if: option to control whether steps run based on previous results
• Error accumulation from all failed steps in the workflow
• Result chaining where the last successful step's result becomes the workflow result
• Full compatibility with the existing Serviz interface (success(), failure(), errors, result)

Custom Parameters

You can also pass custom parameters to individual steps:

class OrderProcessing extends ServizWorkflow {}

OrderProcessing.step(ValidateOrder)

OrderProcessing.step(ChargePayment, { 
  params: { gateway: 'stripe' }, 
  if: (lastStep) => lastStep.success() 
})

OrderProcessing.step(ShipOrder, { 
  if: (lastStep) => lastStep.success() 
})

Browser Usage

Serviz-JS works in browser environments via ES modules:

<script type="module">
  import { Serviz, ServizWorkflow } from './node_modules/serviz/src/index.js'
  
  class MyService extends Serviz {
    call() {
      this.result = 'Hello from browser!'
    }
  }
  
  const operation = MyService.call()
  console.log(operation.result) // "Hello from browser!"
</script>

Or with a bundler like Webpack, Rollup, or Vite:

import { Serviz, ServizWorkflow } from 'serviz'

Development

To contribute to this project:

git clone https://github.com/markets/serviz-js.git
cd serviz-js
npm install

Running Tests

# Run all tests
npm test

# Watch mode
npm run test:watch

License

Copyright (c) Marc Anguera. Serviz-JS is released under the MIT License.