Parcel installs both `gnu` and `musl` bindings on GNU `linux-arm64`

[davidjb]

🐛 bug report

Following on from #8995, I noticed that Parcel installs both gnu and musl bindings on linux-arm64 platforms. I'm deploying to AWS Lambda, so a gnu libc environment, meaning the musl packages and bindings consume ~85 MB extra space that goes unused (of a total 208 MB node_modules).

🎛 Configuration (.babelrc, package.json, cli command)

N/A. See below for CLI install commands.

🤔 Expected Behavior

Parcel to only install required bindings for the current platform.

😯 Current Behavior

Parcel installs both gnu and musl packages, resulting in a lot of unused disk space.

💁 Possible Solution

Deploying to Lambda has a maximum deployment size of 250 MB so in order to meet this, I'm needing to rm -rf these various unused package directories and files out from inside node_ modules. Doing so doesn't break Parcel thankfully, but it would be safer and easier to avoid the install entirely - or for Parcel to clean itself up after determining which of gnu or musl will be used if installation can't be distinguished at that point of npm install.

🔦 Context

Trying to use Parcel on AWS Lambda (maximum deployment size of 250 MB), so node_modules must be as small as possible to allow deployment and allow integration with other code and tooling.

💻 Code Sample

This runs a publicly-hosted container for AWS Lambda AL2023 to match the same Linux environment, then installs Parcel, demonstrating the results:

docker run -it --entrypoint bash public.ecr.aws/lambda/provided:al2023-rapid-arm64 

# dnf install -y nodejs findutils
# yes "" | npm init
# npm install parcel@2.16.3

# du -sh node_modules
208M    node_modules/

# find node_modules -name '*musl*' | xargs du -c -sh
476K    node_modules/@parcel/watcher-linux-arm64-musl
376K    node_modules/@parcel/source-map/parcel_sourcemap_node/artifacts/index.linux-arm64-musl.node
452K    node_modules/@parcel/source-map/parcel_sourcemap_node/artifacts/index.linux-x64-musl.node
45M     node_modules/@parcel/rust-linux-arm64-musl
31M     node_modules/@swc/core-linux-arm64-musl
16K     node_modules/@msgpackr-extract/msgpackr-extract-linux-arm64/node.napi.musl.node
16K     node_modules/@msgpackr-extract/msgpackr-extract-linux-arm64/node.abi115.musl.node
556K    node_modules/@lmdb/lmdb-linux-arm64/node.napi.musl.node
7.7M    node_modules/lightningcss-linux-arm64-musl
85M     total

🌍 Your Environment

Software	Version(s)
Parcel	v2.16.3
Node	v18.20.8
npm/Yarn	10.8.2
Operating System	Amazon Linux release 2023.9.20251117