optional.ts

// can run in https://www.typescriptlang.org/play

type Payload = {
    results?: {
        aggregation?: {
            pie_aggregation?: {
                items?: {
                    buckets: [{
                        key: string
                        filtered: {
                        amount_stats: {sum: number}
                    }}]
                }
            }
        }
    }
}

const experiences = [{id: '1', name: 'name'}]

const payload: Payload = {}

const payload2: Payload = {
  results: {
    aggregation: {
      pie_aggregation: {
        items: {
          buckets: [{key: '1', filtered: {amount_stats: {sum: 3}}}]
        }
      }
    }
  }
}

const toPie = (payload: Payload) => payload.results?.aggregation?.pie_aggregation?.items?.buckets.map(bucket => {
    const experience = experiences.find(experience => experience.id === bucket.key)
    if (!experience) return null
    return {
        name: experience.name,
        y: bucket?.filtered?.amount_stats.sum ?? 0
    }
})

const result = toPie(payload)
const result2 = toPie(payload2)

console.log('Undefined', result)
console.log('Defined', result2)