The next performance improvements

[mrmlnc]

Node.js

• Use fs.scandir from A proposal to add fs.scandir method to FS module nodejs/node#15699. Most likely it will give double performance increase for work with FS (not on all platforms). Right now I can use the scandir-native package, but this is native module and it requires compilation.

Algorithm

• Reduce search time for «constant» patterns (Time to find a non glob path increase with number of files in the same directory #60).

Code

• Write your own package for recursive directory reading. The readdir-enhanced is poorly maintained (code, architecture).

[mubaidr]

Regarding the readdir-enhanced you can use the default readdir and util.promisify it.

[mrmlnc]

Unfortunately, built-in fs.readdir is low level solution. I can write my own solution (and I'll do this as mentioned above), but this will still lead to additional code. We need to be able to understand whether this directory should be read or not (!**/node_modules), whether these entries should be filtered or not and etc.

[mubaidr]

Good point.

Also, what do you think adding an option to ignore files listed in .eslintignore? But this will require searching or specifying location of eslint ignore file.

[sindresorhus]

Relevant: https://twitter.com/bengl/status/1029196268663259136

[mrmlnc]

We can also use https://github.com/micromatch/picomatch in the future major release to reduce the time of the initialization of the filters.

[mrmlnc]

So, I can close this issue in favor:

• Use @nodelib/fs.walk #163
• Move to micromatch@4 or picomatch #154