highland-callback/index.js

Call a node callback with an optional error after stream completes.

var _ = require('highland');

module.exports = function highlandCallback(callback) {
  function consumer(error, value, push, next) {
    if (error) {
      push(null, _.nil);
      return callback(error);
    }

    if (value === _.nil) {
      callback();
      return push(null, value);
    }

    push(null, value);
    next();
  }

  return consumer;
};