'use strict'

exports.supports = function supports (...manifests) {
  const manifest = manifests.reduce((acc, m) => Object.assign(acc, m), {})

  return Object.assign(manifest, {
    snapshots: manifest.snapshots || false,
    permanence: manifest.permanence || false,
    seek: manifest.seek || false,
    clear: manifest.clear || false,
    getMany: manifest.getMany || false,
    keyIterator: manifest.keyIterator || false,
    valueIterator: manifest.valueIterator || false,
    iteratorNextv: manifest.iteratorNextv || false,
    iteratorAll: manifest.iteratorAll || false,
    status: manifest.status || false,
    createIfMissing: manifest.createIfMissing || false,
    errorIfExists: manifest.errorIfExists || false,
    deferredOpen: manifest.deferredOpen || false,
    promises: manifest.promises || false,
    streams: manifest.streams || false,
    encodings: Object.assign({}, manifest.encodings),
    events: Object.assign({}, manifest.events),
    additionalMethods: Object.assign({}, manifest.additionalMethods)
  })
}