scripts/instrument: include deps

But also use zopfli if available!

scripts/instrument

@@ -1,5 +1,13 @@
 #!/bin/sh
 
+dirname=$(dirname "$(readlink -f "$0")")
+
+browserify="$dirname/../node_modules/.bin/browserify"
+uglify="$dirname/../node_modules/.bin/uglifyjs"
+pretty_bytes="$dirname/../node_modules/.bin/pretty-bytes"
+gzip_size="$dirname/../node_modules/.bin/gzip-size"
+discify="$dirname/../node_modules/.bin/discify"
+
 usage () {
 cat << USAGE
 script/test-size
@@ -10,38 +18,51 @@ script/test-size
 USAGE
 }
 
+# use zopfli for better compression if available
+gzip () {
+  zopfli -h 2>/dev/null
+  if [ $? -eq 0 ]; then
+    zopfli "$1" -i1000 -c | wc -c
+  else
+    "$gzip_size" < "$1"
+  fi
+}
+
 gzip_size () {
-  browserify index.js \
+  mkdir -p tmp/
+  "$browserify" index.js \
     -g unassertify \
     -g yo-yoify \
     -g es2020 \
     -g uglifyify \
     -p bundle-collapser/plugin \
-    | uglifyjs \
-    | gzip-size \
-    | pretty-bytes
+    | "$uglify" \
+    > tmp/bundle.min.js
+
+    gzip tmp/bundle.min.js | "$pretty_bytes"
+    rm -rf tmp/
 }
 
 min_size () {
-  browserify index.js \
+  "$browserify" index.js \
     -g unassertify \
     -g yo-yoify \
     -g es2020 \
     -g uglifyify \
     -p bundle-collapser/plugin \
-    | uglifyjs \
+    | "$uglify" \
     | wc -c \
-    | pretty-bytes
+    | "$pretty_bytes"
 }
 
 run_discify () {
-  browserify index.js --full-paths \
+  "$browserify" index.js --full-paths \
     -g unassertify \
     -g yo-yoify \
     -g es2020 \
     -g uglifyify \
-    | uglifyjs \
-    | discify --open
+    | "$uglify" \
+    | "$discify" --open
 }
 
 # set CLI flags