Avoid some bloat in wasm build

script/build-wasm

@@ -6,9 +6,11 @@ args="-Os"
 minify=1
 if [[ "$1" == "--debug" ]]; then
   minify=0
-  args="-s ASSERTIONS=1 -s SAFE_HEAP=1 -O0"
+  args="-s ASSERTIONS=1 -s SAFE_HEAP=1 -Os"
 fi
 
+exports=$(cat lib/web/exports.json)
+
 mkdir -p target/scratch target/release
 
 docker run                          \
@@ -22,8 +24,9 @@ docker run                          \
   -s WASM=1                         \
   -s TOTAL_MEMORY=33554432          \
   -s ALLOW_MEMORY_GROWTH            \
-  -s MAIN_MODULE=1                  \
-  -s EXPORT_ALL=1                   \
+  -s MAIN_MODULE=2                  \
+  -s NO_FILESYSTEM=1                \
+  -s "EXPORTED_FUNCTIONS=${exports}" \
   $args                             \
   -std=c99                          \
   -D 'fprintf(...)='                \

script/generate-fixtures-wasm

@@ -7,17 +7,13 @@ cargo build --release
 root_dir=$PWD
 tree_sitter=${root_dir}/target/release/tree-sitter
 grammars_dir=${root_dir}/test/fixtures/grammars
-grammar_names=(
-  c
-  javascript
-  python
-)
+grammar_names=$(ls $grammars_dir)
 
 if [[ "$#" > 0 ]]; then
   grammar_names=($1)
 fi
 
-for grammar_name in ${grammar_names[@]}; do
+for grammar_name in $grammar_names; do
   echo "Compiling ${grammar_name} parser to wasm"
   $tree_sitter build-wasm ${grammars_dir}/${grammar_name}
 done

script/generate-wasm-exports-list

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+root_dir=$PWD
+grammars_dir=${root_dir}/test/fixtures/grammars
+grammar_names=$(ls $grammars_dir | tr '-' '_')
+
+symbol_file=$(mktemp)
+
+for grammar_name in $grammar_names; do
+  wasm-objdump                                                \
+    --details target/release/tree-sitter-${grammar_name}.wasm \
+    --section Import                                          \
+    | egrep -o '<(\w+)>'                                      \
+    | tr -d '<>'                                              \
+    >> $symbol_file
+done
+
+sort -u -o $symbol_file $symbol_file
+cat $symbol_file