For using aws stepfunction choice json pattern

aws-sf-choice is json-condition pattern as aws asl pattern

aws stepfunction choice document:

https://docs.aws.amazon.com/step-functions/latest/dg/amazon-states-language-choice-state.html

Features

The following comparison operators are supported:

• And
• BooleanEquals,BooleanEqualsPath
• IsBoolean
• IsNull
• IsNumeric
• IsPresent
• IsString
• IsTimestamp
• Not
• NumericEquals,NumericEqualsPath
• NumericGreaterThan,NumericGreaterThanPath
• NumericGreaterThanEquals,NumericGreaterThanEqualsPath
• NumericLessThan,NumericLessThanPath
• NumericLessThanEquals,NumericLessThanEqualsPath
• Or
• StringEquals,StringEqualsPath
• StringGreaterThan,StringGreaterThanPath
• StringGreaterThanEquals,StringGreaterThanEqualsPath
• StringLessThan,StringLessThanPath
• StringLessThanEquals,StringLessThanEqualsPath
• TimestampEquals,TimestampEqualsPath
• TimestampGreaterThan,TimestampGreaterThanPath
• TimestampGreaterThanEquals,TimestampGreaterThanEqualsPath
• TimestampLessThan,TimestampLessThanPath
• TimestampLessThanEquals,TimestampLessThanEqualsPath

Install

npm install aws-sf-choice

Useage

import {Choice } from 'aws-sf-choice'

let sampleCondition = {
 Type: "Choice",
    Choices: [
      {
        Variable: "$.r",
        IsPresent: true,
        Next: "nextState1"
      },
      { 
        Not:{
          Variable: "$.r",
          IsTimestamp: true,
        },
        Next: "nextState2",
      }
    ],
    Default: "DefaultState"
}

let sampleData = {
    r : "this is sample text",
    rr : 2
}

let choice = new Choice(sampleCondition,sampleData) // fist is condition , second is data
choice.start()
    .then(r=>{
        console.log("next state is : ",r)
    })

start() method is promise function you could get next state by await