docs: function resolveFunctionList (functionList, basedir) {
    if (!functionList) return []
    return (Array.isArray(functionList) ? functionList : [functionList])
      .map(function (proc) {
        if (typeof (proc) === 'string') {
          proc = require(resolve.sync(proc, { basedir: basedir }))
        }
        return toAsync(proc)
      })
  }