codestyleSample.js

patch ({state, getters, commit, dispatch}, doc) {
  
  const store = this
  let response
  
  // check that the payload exists
  if (doc) {
    
    const id = (getters.collectionMode) ? getId(doc) : getters.docModeId,
      value = (getters.collectionMode) ? getValueFromPayloadPiece(doc) : doc
    
    // if we have a doc id
    if (id || !getters.collectionMode) {
      
      // check userId
      dispatch('setUserId')
        
      // add id to value
      if (!value.id) {
          value.id = id
      }
      
      // check for a hook before local change
      if (state._conf.sync.patchHook) {
        state._conf.sync.patchHook(v => dispatch('_patchFinish', v), value, store)
      }
      else {
        dispatch('_patchFinish', value)
      }

      response = id
    }
    else {
      response = logError('patch-missing-id')
    }
  }
  else {
    response = logError('missing-payload')
  }
  
  return response
},
// define the store update
_patchFinish ({state, getters, commit, dispatch}, _val) {

  commit('PATCH_DOC', _val)
  
  const v = copy(_val),
    // the firestore update
    firestoreUpdateFn = v => dispatch('patchDoc', {id, doc: copy(v)})
  
  let promise
    
  // check for a hook after local change before sync
  if (state._conf.sync.patchHookBeforeSync) {
    promise = state._conf.sync.patchHookBeforeSync(firestoreUpdateFn, copy(_val), store)
  }
  else {
    promise = firestoreUpdateFn(v)
  }

  return promise
},