<commit_before>import { propagationClick$ as getPropagationClick$ } from 'board/event'
import { propagation } from 'board/intent'
import { propagate } from 'board/mutation'
import { boardPresenter } from 'board/presenter'
import { boardDOM } from 'board/view'

export const board = {
  stateProgression: (sources) => {
    const propagationClick$ = getPropagationClick$(sources.DOM)
    const propagation$ = propagationClick$.map(propagation)
    const reducer$ = propagation$.map(propagate)
    const initialState =
      [ [true, true],
        [true, false] ]

    return {
      propagation$,
      reducer$,
      initialState,
    }
  },
  viewProgression: (states) => {
    const boardPresenter$ = states.state$.map(boardPresenter)
    const boardDOM$ = boardPresenter$.map(boardDOM)

    return {
      DOM: boardDOM$
    }
  }
}<commit_msg>comment on returning propagation$<commit_after>import { propagationClick$ as getPropagationClick$ } from 'board/event'
import { propagation } from 'board/intent'
import { propagate } from 'board/mutation'
import { boardPresenter } from 'board/presenter'
import { boardDOM } from 'board/view'

export const board = {
  stateProgression: (sources) => {
    const propagationClick$ = getPropagationClick$(sources.DOM)
    const propagation$ = propagationClick$.map(propagation)
    const reducer$ = propagation$.map(propagate)
    const initialState =
      [ [true, true],
        [true, false] ]

    return {
      propagation$, // not usually returned with stateProgression, but move-history is interested in this stream
      reducer$,
      initialState,
    }
  },
  viewProgression: (states) => {
    const boardPresenter$ = states.state$.map(boardPresenter)
    const boardDOM$ = boardPresenter$.map(boardDOM)

    return {
      DOM: boardDOM$
    }
  }
}
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{'dir': 'git-commits-cleaned', 'id': '3054277', 'n_tokens_mistral': 540, 'n_tokens_neox': 521, 'n_words': 129}