Method _getUnionNames

external/.scrollLibs.js:16277–16287

()

    return prev === -1 ? parent._getSubparticlesArray()[length - 1] : parent._getSubparticlesArray()[prev]
  }
  _getUnionNames() {
    if (!this.length) return []
    const obj = {}
    this.forEach(particle => {
      if (!particle.length) return undefined
      particle.forEach(particle => {
        obj[particle.cue] = 1
      })
    })
    return Object.keys(obj)
  }
  getAncestorParticlesByInheritanceViaExtendsCue(key) {
    const ancestorParticles = this._getAncestorParticles(
      (particle, id) => particle._getParticlesByColumn(0, id),