fix: force environment to node

This wasm binding requires node because of the requirement to have node
rawfs. It is therefore not good to leave emscripten to guess the runtime
environment. Instead, it is now forced at build time to node.

build.sh

@@ -235,13 +235,16 @@ if [ "$TARGET" == "all" ] || [ "$TARGET" == "binding" ]; then
 
     SRCS="magic-js.cpp"
     # Compile the code
+    # We enable FS, using node rawfs and we force the environment to always 
+    # be node, thus disabling the auto-detection at runtime
     EMCC_OPTIONS="-O3 \
 -fno-exceptions \
 --bind \
 -s ASSERTIONS=1 \
 -s ALLOW_MEMORY_GROWTH=1 \
 -s MALLOC=emmalloc \
 -s MODULARIZE=1 \
+-s ENVIRONMENT=node \
 -s FILESYSTEM=1 \
 -s NODERAWFS=1 \
 -o ../magic-js.js \