can build ts scripts into a single js file

.vn/scripts/README.md

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+# How to develop a script
+
+## Separate build for scripts
+
+You may want to enjoy TypeScript within scripts, and also reuse
+handy helpers you created in the app, like the Mongoose connection code.
+
+To do so, you need a build-step outside of Next, that mimicks most of the same feature
+but can run independently.
+
+To achieve this, you need a mix between Webpack and TypeScript. Webpack is responsible
+for creating one bundled .js file, TypeScript for transpiling the code.
+
+Hopefully, Vercel got us covered already for the config: see https://github.com/vercel/ncc
+
+## Step by step
+
+- Code your script in "./ts-sources"
+- Build the scripts using `yarn run build:scripts` => you end up with a few .js file at the root.
+- Commit the built JS file to the git repository. Note: usually, we don't commit built files,
+but it's ok for scripts because they don't change often.

.vn/scripts/build-scripts.sh

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+#! /bin/bash
+# Utility to run NCC on multiple files
+# Will transform ./ts-sources/foobar.ts into a built ./foobar.js
+# See https://github.com/vercel/ncc
+# NOTE: you are expected to run "yarn run build:scripts" from the project root for path to be correct
+vn_scripts_dir=./.vn/scripts
+for f in "$vn_scripts_dir/ts-sources"/*
+do 
+    echo "Build $f"
+    fname=`basename "$f"`
+    fname_no_ext=`echo "$fname" | cut -d. -f1`
+    echo "Filename $fname, without ext $fname_no_ext"
+    yarn run ncc build "$f" --no-cache --out "$vn_scripts_dir/dist"
+    mv "$vn_scripts_dir/dist/index.js" "$vn_scripts_dir/$fname_no_ext".js
+done
+rm -R "$vn_scripts_dir/dist"