git ssb

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const nest = require('depnest')
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const last = require('lodash/last')
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exports.gives = nest('history.sync.back')
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exports.needs = nest({
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  'history.obs.store': 'first',
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  'router.sync.router': 'first'
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})
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exports.create = (api) => {
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  return nest('history.sync.back', back)
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  function back () {
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    const history = api.history.obs.store()
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    if (history().length === 1) return false
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    history.pop()
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    const location = last(history())
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    const newView = api.router.sync.router(location)
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    renderPage(newView)
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  }
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}
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function renderPage (newView) { 
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  const oldView = document.body.firstChild
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  oldView
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    ? document.body.replaceChild(newView, oldView)
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    : document.body.appendChild(newView)
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}
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