AsyncAPI offers many ways to reuse certain parts of the document like messages or schemas definitions or references to external files, not to even mention the traits. Purpose of AsyncAPI Optimizer is to enable different ways to optimize AsyncAPI files. It is a library that can be used in UIs and CLIs.

• Testing
• Usage
  • Node.js
  • Generating report
  • Applying the suggested changes
• API documentation

Testing

1. Clone the project git https://github.com/asyncapi/optimizer.git
2. Install the dependencies npm i
3. for a quick check you can run npm run example. You can open examples/index.js modify it or add your own AsyncAPI document for optimization.

Usage

Node.js

import { Optimizer } from '@asyncapi/optimizer';
import type { Report } from '@asyncapi/optimizer';

const yaml =`
asyncapi: 2.0.0
info:
  title: Streetlights API
  version: '1.0.0'

channels:

  smartylighting/event/{streetlightId}/lighting/measured:
    parameters:
      #this parameter is duplicated. it can be moved to components and ref-ed from here.
      streetlightId:
        schema:
          type: string
    subscribe:
      operationId: receiveLightMeasurement
      traits:
        - bindings:
            kafka:
              clientId: my-app-id
      message:
        name: lightMeasured
        title: Light measured
        contentType: application/json
        traits:
          - headers:
              type: object
              properties:
                my-app-header:
                  type: integer
                  minimum: 0
                  maximum: 100
        payload:
          type: object
          properties:
            lumens:
              type: integer
              minimum: 0
            #full form is used, we can ref it to: #/components/schemas/sentAt
            sentAt:
              type: string
              format: date-time

  smartylighting/action/{streetlightId}/turn/on:
    parameters:
      streetlightId:
        schema:
          type: string
    publish:
      operationId: turnOn
      traits:
        - bindings:
            kafka:
              clientId: my-app-id
      message:
        name: turnOnOff
        title: Turn on/off
        traits:
          - headers:
              type: object
              properties:
                my-app-header:
                  type: integer
                  minimum: 0
                  maximum: 100
        payload:
          type: object
          properties:
            sentAt:
              $ref: "#/components/schemas/sentAt"

components:
  messages:
    #libarary should be able to find and delete this message, because it is not used anywhere.
    unusedMessage:
      name: unusedMessage
      title: This message is not used in any channel.
      
  schemas:
    #this schema is ref-ed in one channel and used full form in another. library should be able to identify and ref the second channel as well.
    sentAt:
      type: string
      format: date-time`;

const optimizer = new Optimizer(yaml);

Generating report

const report: Report = await optimizer.getReport();
/*
the report value will be:
{
  reuseComponents: [
    {
      path: 'channels.smartylighting/event/{streetlightId}/lighting/measured.message.payload.properties.sentAt',
      action: 'reuse',
      target: 'components.schemas.sentAt'
    }
  ],
  removeComponents: [
    {
      path: 'components.messages.unusedMessage',
      action: 'remove',
    }
  ],
  moveToComponents: [
    {
      //move will ref the current path to the moved component as well.
      path: 'channels.smartylighting/event/{streetlightId}/lighting/measured.parameters.streetlightId',
      action: 'move',
      target: 'components.parameters.streetlightId'
    },
    {
      path: 'channels.smartylighting/action/{streetlightId}/turn/on.parameters.streetlightId',
      action: 'reuse',
      target: 'components.parameters.streetlightId'
    }
  ]
}
 */

Applying the suggested changes

const optimizedDocument = optimizer.getOptimizedDocument({
  rules: {
    reuseComponents: true,
    removeComponents: true,
    moveToComponents: true 
  }
});
/*
the optimizedDocument value will be:

asyncapi: 2.0.0
info:
  title: Streetlights API
  version: 1.0.0
channels:
  "smartylighting/event/{streetlightId}/lighting/measured":
    parameters:
      streetlightId:
        $ref: "#/components/parameters/parameter-1"
    subscribe:
      operationId: receiveLightMeasurement
      traits:
        - bindings:
            kafka:
              clientId: my-app-id
      message:
        name: lightMeasured
        title: Light measured
        contentType: application/json
        traits:
          - headers:
              $ref: "#/components/schemas/schema-1"
        payload:
          type: object
          properties:
            lumens:
              type: integer
              minimum: 0
            sentAt:
              $ref: "#/components/schemas/sentAt"
  "smartylighting/action/{streetlightId}/turn/on":
    parameters:
      streetlightId:
        $ref: "#/components/parameters/parameter-1"
    publish:
      operationId: turnOn
      traits:
        - bindings:
            kafka:
              clientId: my-app-id
      message:
        name: turnOnOff
        title: Turn on/off
        traits:
          - headers:
              $ref: "#/components/schemas/schema-1"
        payload:
          type: object
          properties:
            sentAt:
              $ref: "#/components/schemas/sentAt"
components:
  schemas:
    sentAt:
      type: string
      format: date-time
    schema-1:
      type: object
      properties:
        my-app-header:
          type: integer
          minimum: 0
          maximum: 100
  parameters:
    parameter-1:
      schema:
        type: string`
 */

API documentation

For using the optimizer to optimize file you just need to import the Optimizer class. Use its two methods to get the report (getReport()) and get the optimized document (getOptimizedDocument()).

See API documentation for more example and full API reference information.