const data = {
   "id":0,
   "name":"Regra 01",
   "type":"ICMS",
   "subtype":"ICMSCost",
   "filters":{
      "originStep":{
         "origin":"",
         "contract":"",
         "profile":"",
         "consumer":""
      },
      "destinyStep":{
         "state":"",
         "unit":"",
         "profile":""
      },
      "parametersStep":{
         "origin":"",
         "contract":"",
         "state":"",
         "profile":"",
         "consumer":""
      }
   },
   "contracts":[
      {
         "provider":0,
         "contracts":[
            1,
            2,
            0
         ]
      },
      {
         "provider":1,
         "contracts":[
            3,
            2,
            1,
            0
         ]
      },
      {
         "provider":2,
         "contracts":[
            0,
            1,
            2
         ]
      }
   ],
   "generators":[
      0
   ],
   "states":[
      {
         "state":0,
         "units":[
            0,
            1,
            2,
            3
         ]
      },
      {
         "state":1,
         "units":[
            2,
            1,
            0
         ]
      }
   ],
   "consumptionOrder":[
      {
         "provider":1,
         "contract":1,
         "state":1,
         "unit":1,
         "order":1,
         "value":""
      },
      {
         "provider":2,
         "contract":2,
         "state":2,
         "unit":2,
         "order":2,
         "value":""
      },
      {
         "provider":3,
         "contract":3,
         "state":3,
         "unit":3,
         "order":3,
         "value":""
      }
   ]
}

console.log(data)
console.log('-------------------')

const flattenContractsByProviders = data.contracts.reduce((acc, { contracts, provider }) => {
  const contractsWithProvider = contracts.map(c => ({
    contract: c,
    provider
  }))

  return [
    ...acc,
   ...contractsWithProvider
  ]
}, [])

console.log(flattenContractsByProviders)

console.log('-----------------')
const flattenUnitsByStates = data.states.reduce((acc, { state, units }) => {
  const unitsWithState = units.map(s => ({
    state,
    unit: s
  }))

  return [
    ...acc,
   ...unitsWithState
  ]
}, [])

console.log(flattenUnitsByStates)

const a = flattenContractsByProviders.reduce((acc, item) => {
  const b = flattenUnitsByStates.map(itemB => ({
    ...item,
    ...itemB
  }))

  return [
    ...acc,
    ...b
  ]
}, [])

console.log(a)