index.js
function all(children) {
    var length = children && children.length
    var index = -1
    var result = []
    var child

    while (++index < length) {
      child = one(children[index])

      if (child) {
        result = result.concat(child)
      }
    }

    return result
  }
function all(children) {
    var length = children && children.length
    var index = -1
    var result = []
    var child

    while (++index < length) {
      child = one(children[index])

      if (child) {
        result = result.concat(child)
      }
    }

    return result
  }
Convert all `children` (HAST) to NLCST.