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How to compare 2 folders using Windows PowerShell

Just copying here the Windows PowerShell script from this blog post because I really don’t want to ever lose it:

$folderA = Get-ChildItem -Recurse -path C:\folderA\
$folderB = Get-ChildItem -Recurse -path C:\folderB\
Compare-Object -ReferenceObject $folderA -DifferenceObject $folderB

I use 2 different computers to deploy a Serverless project I work on, and I noticed the deployment artifacts had different sizes depending on the computer I deployed from :s So I grabbed an archive from each deployment, unzipped them, and used this to compare them.

It turned out the culprit was Ava, which puts a bunch of js and js.map files in node_modules/.cache/ava. Excluding the whole node_modules/.cache/** from Serverless deployment (serverless.yml > package > exclude) allowed me to shrink the deployment artifact by a few hundreds of kB. On a side note, it appears that Ava leaves behind a lot of trash in this folder, so you may want to purge it manually from time to time.

Posted in JavaScript / TypeScript / Node.js, Windows.


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