Related: #5937
Issue there was the binlog getting dropped in the root and having different rules for what the gitignore could do. Moving where it got dropped would help.

Changes for this will most likely be in vnext\templates\templateUtils.js to be used by the templateConfig.js files in the cpp-lib and cpp-app templates.

@jonthysell for more help/guidance.

@jonthysell Looking at helping with this issue.

1. Seems straight forward enough, would you do something like that inside the cli at initWindows.ts?
2. Going this route would avoid having to do 1 at all, do we just want to default buildLogDirectory to the windows dir, then update the vnext ignore templates?

I suppose we would want to add *.err and *.wrn in addition to *.binlog. Thoughts?

@jonthysell Looking at helping with this issue.

1. Seems straight forward enough, would you do something like that inside the cli at initWindows.ts?
2. Going this route would avoid having to do 1 at all, do we just want to default buildLogDirectory to the windows dir, then update the vnext ignore templates?

I suppose we would want to add *.err and *.wrn in addition to *.binlog. Thoughts?

I agree if we just did 2 that would give us what we need and not pollute the project's main folder with build output. It's interesting to me that if you don't specify a folder with --buildLogDirectory, we only keep the binlog file and then put the err and wrn files in the temp folder.

I think then, the fix looks something like this in msbuildttools.ts:

1. Update the logPrefix to default to the windows folder (rather than the tmp folder) if buildLogDirectory is not specified:

   react-native-windows/packages/@react-native-windows/cli/src/utils/msbuildtools.ts

   Lines 96 to 99 in a4e227e

   	const logPrefix = path.join(
   	buildLogDirectory || os.tmpdir(),
   	`msbuild_${process.pid}_${target}`,
   	);

2. Remove the localBinLog (I don't see why we need that at all) and update the const binlog to

const binlog = `:${logPrefix}.binlog`;

here:

Then we just need to add *.binlog, *.err, and *.wrn to the template _gitignore files at vnext/templates/cpp-app/windows/_gitignore and vnext/templates/cpp-lib/windows/_gitignore

@jonthysell thanks for the guidance! I have a draft PR up, I still want to test it locally better.

I was reading the Contributing to the CLI docs, but I didn't quite grok the proper way to test my local CLI changes just yet.