rtl: 0.12.3-beta -> 0.13.0

- Use `fetch-node-modules` to remove the 4161 line file `node-packages.nix`
- Only use nodejs-slim as a runtime dependency
- Shrink package size by >500M by excluding certain dev-only dependencies

helper/update-fixed-output-derivation.sh

@@ -0,0 +1,24 @@
+set -euo pipefail
+
+# The file that defines the derivation that should be updated
+file=$1
+# The name of the output of this flake that should be updated
+flakeOutput=$2
+# A pattern in a line preceding the hash that should be updated
+patternPrecedingHash=$3
+
+sed -i "/$patternPrecedingHash/,/hash/ s|hash = .*|hash = \"\";|" $file
+# Display stderr and capture it. stdbuf is required to disable output buffering.
+stderr=$(
+    nix build --no-link -L .#$flakeOutput |&
+      stdbuf -oL grep -v '\berror:.*failed to build$' |
+      tee /dev/stderr || :
+)
+hash=$(echo "$stderr" | sed -nE 's/.*?\bgot: *?(sha256-.*)/\1/p')
+if [[ ! $hash ]]; then
+    echo
+    echo "Error: No hash in build output."
+    exit 1
+fi
+sed -i "/$patternPrecedingHash/,/hash/ s|hash = .*|hash = \"$hash\";|" $file
+echo "(Note: The above hash mismatch message is not an error. It is part of the fetching process.)"