How to update item of deep array in mutation

[enjkvbej]

state = {
  list: [
      {
          config: {
              children: []
          },
      },
  ]
}

mutation:
const copyRow = cloneDeep(state.list[0]) // lodash cloneDeep
copyRow.config.children.push({xxx: xxx})
state.list.splice(0, 1, copyRow)

expect: add item in chlidren
error: [vuex] do not mutate vuex store state outside mutation handlers.
Please help me! Thanks!

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