Clarify why we need node_modules.asar

ci/build/npm-postinstall.sh

@@ -42,14 +42,11 @@ vscode_yarn() {
   cd lib/vscode
   yarn --production --frozen-lockfile
 
-  # VS Code needs a node_modules.asar but that's just a duplicate of stuff we
-  # already have in node_modules.
+  # This is a copy of symlink_asar in ../lib.sh. Look there for details.
   if [ ! -e node_modules.asar ]; then
     if [ "${WINDIR-}" ]; then
-      # mklink takes the link name first.
       mklink /J node_modules.asar node_modules
     else
-      # ln takes the link name second.
       ln -s node_modules node_modules.asar
     fi
   fi

ci/lib.sh

@@ -95,8 +95,13 @@ export OS
 # Defaults to release
 RELEASE_PATH="${RELEASE_PATH-release}"
 
-# Symlink node_modules.asar to node_modules. VS Code needs a node_modules.asar
-# but that's just a duplicate of stuff we already have in node_modules.
+# VS Code bundles some modules into an asar which is an archive format that
+# works like tar. It then seems to get unpacked into node_modules.asar.
+#
+# I don't know why they do this but all the dependencies they bundle already
+# exist in node_modules so just symlink it. We have to do this since not only VS
+# Code itself but also extensions will look specifically in this directory for
+# files (like the ripgrep binary or the oniguruma wasm).
 symlink_asar() {
   if [ ! -e node_modules.asar ]; then
     if [ "${WINDIR-}" ]; then