fs.createWriteStream with path that includes dots(.) failed in asar

[mizchi]

__dirname # "/Users/mizchi/<my-project-path>/Atom.app/Contents/Resources/app/versions/0.9.0.asar"

savePath = path.join __dirname, '../1.0.0.asar'
wstream = fs.createWriteStream savePath

It failed.

Error: Invalid package /Users/mizchi/<my-project-path>/Atom.app/Contents/Resources/app/versions/1.0.0.asar

but savePath = path.join __dirname, '../1-0-0-asar' succeed.

[Ashkin]

I believe this is caused, not by the .'s in your path, but by the .asar extension.

From my tests, fs.createWriteSteam() throws an "Invalid package" error when creating a new .asar file, and a "ENOENT" error when given an existing .asar file. Simply changing the file extension to .dat will resolve it immediately, though is likely not the behavior you require.

Regardless, this hints at a deeper problem.

[Ashkin]

Update

Here's the root cause: electron/electron#2198