_stream_passthrough.js 1.7 KB

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  1. // Copyright Joyent, Inc. and other Node contributors.
  2. //
  3. // Permission is hereby granted, free of charge, to any person obtaining a
  4. // copy of this software and associated documentation files (the
  5. // "Software"), to deal in the Software without restriction, including
  6. // without limitation the rights to use, copy, modify, merge, publish,
  7. // distribute, sublicense, and/or sell copies of the Software, and to permit
  8. // persons to whom the Software is furnished to do so, subject to the
  9. // following conditions:
  10. //
  11. // The above copyright notice and this permission notice shall be included
  12. // in all copies or substantial portions of the Software.
  13. //
  14. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15. // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16. // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  17. // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  18. // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19. // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20. // USE OR OTHER DEALINGS IN THE SOFTWARE.
  21. // a passthrough stream.
  22. // basically just the most minimal sort of Transform stream.
  23. // Every written chunk gets output as-is.
  24. 'use strict';
  25. module.exports = PassThrough;
  26. var Transform = require('./_stream_transform');
  27. /*<replacement>*/
  28. var util = Object.create(require('core-util-is'));
  29. util.inherits = require('inherits');
  30. /*</replacement>*/
  31. util.inherits(PassThrough, Transform);
  32. function PassThrough(options) {
  33. if (!(this instanceof PassThrough)) return new PassThrough(options);
  34. Transform.call(this, options);
  35. }
  36. PassThrough.prototype._transform = function (chunk, encoding, cb) {
  37. cb(null, chunk);
  38. };