Minify JS build with terser

script/build-wasm

@@ -1,15 +1,15 @@
 #!/usr/bin/env bash
 
+set -e
+
 export EMCC_FORCE_STDLIBS=libc++
 
 args="-Os"
-target_dir="target/release"
 if [[ "$1" == "--debug" ]]; then
-  args="-s SAFE_HEAP=1 -O0"
-  target_dir="target/debug"
+  args="-s ASSERTIONS=1 SAFE_HEAP=1 -O0"
 fi
 
-mkdir -p $target_dir
+mkdir -p target/scratch target/release
 
 docker run                          \
   --rm                              \
@@ -21,7 +21,6 @@ docker run                          \
   -s WASM=1                         \
   -s ALLOW_MEMORY_GROWTH            \
   -s MAIN_MODULE=1                  \
-  -s ASSERTIONS=1                   \
   -s EXPORT_ALL=1                   \
   $args                             \
   -std=c99                          \
@@ -34,4 +33,21 @@ docker run                          \
   --post-js lib/web/binding.js      \
   lib/src/lib.c                     \
   lib/web/binding.c                 \
-  -o $target_dir/tree-sitter.js
+  -o target/scratch/tree-sitter.js
+
+if [ ! -d lib/web/node_modules/terser ]; then
+  (
+    cd lib/web
+    npm install
+  )
+fi
+
+lib/web/node_modules/.bin/terser   \
+  --compress                       \
+  --mangle                         \
+  --keep-fnames                    \
+  --keep-classnames                \
+  -- target/scratch/tree-sitter.js \
+  > target/release/tree-sitter.js
+
+mv target/scratch/tree-sitter.wasm target/release/tree-sitter.wasm