TypeError: exists is not a function

[caalberts]

Hi, I'm getting this error when using Level.

Console shows the error here, which is in bindings module:

exports.getRoot = function getRoot (file) {
  var dir = dirname(file)
    , prev
  while (true) {
    if (dir === '.') {
      // Avoids an infinite loop in rare cases, like the REPL
      dir = process.cwd()
    }
    if (exists(join(dir, 'package.json')) || exists(join(dir, 'node_modules'))) {
      // Found the 'package.json' file or 'node_modules' dir; we're done
      return dir
    }

[ralphtheninja]

@caalberts Do you have the error log from the console by any chance as well? Can you write a small script that shows how to reproduce this?

[juliangruber]

this is from the bindings module:

  , exists = fs.existsSync || path.existsSync

I wouldn't know which node version didn't have support for that. What node are you running on?

[juliangruber]

also, can you tell us the output of

console.log(fs.existsSync || path.existsSync)

[ralphtheninja]

I noticed this TooTallNate/node-bindings#18 and TooTallNate/node-bindings#20 is a fix for it

[kaivalya90]

I still got the same error even after the change.
while (true) {
if (dir === '.') {
// Avoids an infinite loop in rare cases, like the REPL
dir = process.cwd()
}
if (exists(join(dir, 'package.json')) || exists(join(dir, 'node_modules'))) {
// Found the 'package.json' file or 'node_modules' dir; we're done
return dir
}
bindings.js:154Uncaught TypeError: exists is not a function

Does anyone face the same issue?

Thanks,

[juliangruber]

@kaivalya90 which node version are you on?

[kaivalya90]

E:\angularJS\XXxxCap>meteor node --version
v4.4.7

[juliangruber]

node@4 definitely has fs.existsSync, the issue must lie elsewhere

[rmroot]

@kaivalya90 did you ever found out what was going on with that error? I'm running into the same issue

[Twistedst]

Found that the fix is in TooTallNate/node-bindings#20 (as stated above). The PR for the commit is still open though, so it hasn't been updated.

[Ameobea]

The PR has been accepted; not sure if this library's dependencies have been updated however.

[mesozoic-technology]

I just encountered this error in the browser console while trying to browserify an application containing leveldb

[fergiemcdowall]

I seem to be getting this as well- also during browserification

[ralphtheninja]

Would be nice to get to the bottom of this.

[vweevers]

I just encountered this error in the browser console while trying to browserify an application containing leveldb

I seem to be getting this as well- also during browserification

That's expected: level only supports Node.js. There is ongoing work to make it work in both Node.js and in the browser. In the meantime, we suggest you to use level-browserify.

[vweevers]

I'm closing this, as it's not a bug, but a missing feature, which is covered by #50.

[naveed-31]

Stuck on this issue :

ERROR Error: Uncaught (in promise): TypeError: exists is not a function
TypeError: exists is not a function
at Function.getRoot (bindings.js:205)
at bindings (bindings.js:84)
at Object. (pcsclite.js:4)

[vweevers]

@naveed-31 Latest level no longer uses the bindings module, so it shouldn't be an issue anymore. Which version are you using?

[naveed-31]

Actually i am using this model @pokusew (nfc-pcsc) which uses the bindings module.any idea?

[vweevers]

@naveed-31 If your issue is not related to level, then this is not the right place to discuss it.

[arturbp]

The same here when trying to using 'usb' lib in ReactJS:

TypeError: exists is not a function

199 | // Avoids an infinite loop in rare cases, like the REPL
200 | dir = process.cwd();
201 | }

202 | if (
| ^ 203 | exists(join(dir, 'package.json')) ||
204 | exists(join(dir, 'node_modules'))
205 | ) {

in bindings:

...
exists =
(fs.accessSync &&
function(path) {
try {
fs.accessSync(path);
} catch (e) {
return false;
}
return true;
}) ||
fs.existsSync ||
path.existsSync,
...

node v14.15.0