Function start

examples/04-fact-dependency.js:18–128

()

const accountClient = require('./support/account-api-client')

async function start () {
  /**
   * Setup a new engine
   */
  const engine = new Engine()

  /**
   * Rule for identifying microsoft employees that have been terminated.
   * - Demonstrates re-using a same fact with different parameters
   * - Demonstrates calling a base fact, which serves to load data once and reuse later
   */
  const microsoftRule = {
    conditions: {
      all: [{
        fact: 'account-information',
        operator: 'equal',
        value: 'microsoft',
        path: '$.company'
      }, {
        fact: 'account-information',
        operator: 'equal',
        value: 'terminated',
        path: '$.status'
      }]
    },
    event: { type: 'microsoft-terminated-employees' }
  }
  engine.addRule(microsoftRule)

  /**
   * Rule for identifying accounts older than 5 years
   * - Demonstrates calling a base fact, also shared by the account-information-field fact
   * - Demonstrates performing computations on data retrieved by base fact
   */
  const tenureRule = {
    conditions: {
      all: [{
        fact: 'employee-tenure',
        operator: 'greaterThanInclusive',
        value: 5,
        params: {
          unit: 'years'
        }
      }]
    },
    event: { type: 'five-year-tenure' }
  }
  engine.addRule(tenureRule)

  /**
   * Register listeners with the engine for rule success and failure
   */
  let facts
  engine
    .on('success', event => {
      console.log(facts.accountId + ' DID '.green + 'meet conditions for the ' + event.type.underline + ' rule.')
    })
    .on('failure', event => {