Enable partial transpilation for upgradeable package (#4628)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
(cherry picked from commit 58463a9823)

scripts/prepack.sh

@@ -4,9 +4,20 @@ set -euo pipefail
 shopt -s globstar
 
 # cross platform `mkdir -p`
-node -e 'fs.mkdirSync("build/contracts", { recursive: true })'
+mkdirp() {
+  node -e "fs.mkdirSync('$1', { recursive: true })"
+}
 
-cp artifacts/contracts/**/*.json build/contracts
-rm build/contracts/*.dbg.json
+# cd to the root of the repo
+cd "$(git rev-parse --show-toplevel)"
 
+npm run clean
+
+env COMPILE_MODE=production npm run compile
+
+mkdirp contracts/build/contracts
+cp artifacts/contracts/**/*.json contracts/build/contracts
+rm contracts/build/contracts/*.dbg.json
 node scripts/remove-ignored-artifacts.js
+
+cp README.md contracts/