usage demo comes error: "TypeError: dest.on is not a function"

I run the usage demo:

const yauzl = require("yauzl");

yauzl.open("./OMStarPS_npi.capacity_11.5.0.zip", {lazyEntries: true}, function(err, zipfile) {
  if (err) throw err;
  zipfile.readEntry();
  zipfile.on("entry", function(entry) {
    if (/\/$/.test(entry.fileName)) {
      // Directory file names end with '/'.
      // Note that entires for directories themselves are optional.
      // An entry's fileName implicitly requires its parent directories to exist.
      zipfile.readEntry();
    } else {
      // file entry
      zipfile.openReadStream(entry, function(err, readStream) {
        if (err) throw err;
        readStream.on("end", function() {
          zipfile.readEntry();
        });
        readStream.pipe('./');
      });
    }
  });
});

comes error:

_stream_readable.js:501
  dest.on('unpipe', onunpipe);
       ^

TypeError: dest.on is not a function
    at AssertByteCountStream.Readable.pipe (_stream_readable.js:501:8)
    at D:\node\www\test\test-unzip\yauzl.js:19:20
    at D:\node\www\test\test-unzip\node_modules\yauzl\index.js:575:7
    at D:\node\www\test\test-unzip\node_modules\yauzl\index.js:631:5
    at D:\node\www\test\test-unzip\node_modules\fd-slicer\index.js:32:7
    at FSReqWrap.wrapper [as oncomplete] (fs.js:682:17)

I just wanna unzip a zip file.

[thejoshwolfe]

Ah, yeah. Sorry. That require call is confusing. I’ve updated it with a comment explaining how to translate that to be useful outside of yauzl’s source code directory structure.

I took another look at your code from the OP, and I don’t know why I didn’t see this before, but the problem is here:

readStream.pipe('./');

You have to pipe() into a stream, not a file path. In my example I linked above I make a file write stream here: https://github.com/thejoshwolfe/yauzl/blob/51010ce4e8c7e6345efe195e1b4150518f37b393/examples/unzip.js#L193 https://github.com/thejoshwolfe/yauzl/blob/51010ce4e8c7e6345efe195e1b4150518f37b393/examples/unzip.js#L196

There are lots of other kinds of streams you can pipe the file contents into.

[bi-kai]

PS D:\node\www\test\test-unzip> node -v
v8.11.1
PS D:\node\www\test\test-unzip> node .\yauzl.js
_stream_readable.js:582
  dest.on('unpipe', onunpipe);
       ^

TypeError: dest.on is not a function
    at AssertByteCountStream.Readable.pipe (_stream_readable.js:582:8)
    at D:\node\www\test\test-unzip\yauzl.js:19:20
    at D:\node\www\test\test-unzip\node_modules\yauzl\index.js:575:7
    at D:\node\www\test\test-unzip\node_modules\yauzl\index.js:631:5
    at D:\node\www\test\test-unzip\node_modules\fd-slicer\index.js:32:7
    at FSReqWrap.wrapper [as oncomplete] (fs.js:658:17)

what is the easiest way to unzip a zip file?