Solve "[DEP0013] DeprecationWarning: Calling an asynchronous function without callback is deprecated."

[GoooodSky]

Here is a contemporary solution from @BenjaminChoou:

1. Find where your node-tesseract module is.

On my computer, the path is :

C:\Users\BenjaminChou\node_modules\node-tesseract\lib

2. Open and modify tesseract.js as follow:

Before:
fs.unlink(files[0]);
Now:
fs.unlink(files[0], err => { if (err) console.log(err) });

[JesseWo]

Thanks!

[ceremcem]

@uchihaty Why don't you create a PR for this?

[jonathonadams]

Is this project sill active? Just an FYI, I'm testing with Node v10 and this error now breaks the project.

Error message:

TypeError [ERR_INVALID_CALLBACK]: Callback must be a function
at makeCallback (fs.js:148:11)
at Object.fs.unlink (fs.js:1016:14)
at /.../node_modules/node-tesseract/lib/tesseract.js:99:14
at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:422:3)
[ERROR] 13:14:21 TypeError [ERR_INVALID_CALLBACK]

[Lucien-X]

Same issue Encountered，
node version v11.0.0

[liuwei0514]

Same issue Encountered，
node version v10.9.0

[halaprop]

Same issue. Probably, the fix should include calling the caller's callback after the unlink...

fs.unlink(files[0], err => { err ? callback(err, null) : callback(null, data); });

[ceremcem]

@halaprop I think something is wrong with your suggestion: Where is the callback and data defined?

[halaprop]

@ceremcem - Sorry, I should have been more explicit. I was looking here, line 100 is where unlink is called. callback is passed to the containing function (process()), and data is the result of an fs.read which encloses this code.