Add es6 modules.

compress.mjs

@@ -0,0 +1,22 @@
+import init from './build/compress_binding.mjs';
+
+const _modulePromise = init();
+
+function _compress(module, buffer) {
+    const result = module.compress(buffer);
+    if (result === false) throw new Error('ConvertTTFToWOFF2 failed');
+    return result;
+}
+
+export default async function compress (buffer) {
+  const module =  await _modulePromise;
+  return _compress(module, buffer);
+}
+
+export async function getCompressSync() {
+    const module = await _modulePromise;
+    function compressSync(buffer) {
+        return _compress(module, buffer);
+    }
+    return compressSync;
+}

decompress.mjs

@@ -0,0 +1,22 @@
+import init from './build/decompress_binding.mjs';
+
+const _modulePromise = init();
+
+function _decompress(module, buffer) {
+    const result = module.decompress(buffer);
+    if (result === false) throw new Error('ConvertWOFF2ToTTF failed');
+    return result;
+}
+
+export default async function decompress (buffer) {
+  const module =  await _modulePromise;
+  return _decompress(module, buffer);
+}
+
+export async function getDecompressSync() {
+    const module = await _modulePromise;
+    function decompressSync(buffer) {
+        return _decompress(module, buffer);
+    }
+    return decompressSync;
+}

src/Makefile

@@ -1,25 +1,43 @@
-CARGS=--bind -s NODEJS_CATCH_REJECTION=0 -s NODEJS_CATCH_EXIT=0 -s ALLOW_MEMORY_GROWTH=1 -s SINGLE_FILE=1 -O3
+CARGS=--bind -s ALLOW_MEMORY_GROWTH=1 -s SINGLE_FILE=1 -O3
+UMDARGS=-s NODEJS_CATCH_REJECTION=0 -s NODEJS_CATCH_EXIT=0
+ES6ARGS=-s MODULARIZE=1 -s EXPORT_ES6=1
 FIXTURES=/src/wawoff2/test/fixtures
 
 all:
 	mkdir -p /src/wawoff2/build
 
-	emcc $(CARGS) -I/src/woff2/include/ \
+	emcc $(CARGS) $(UMDARGS) -I/src/woff2/include/ \
 	  -o /src/wawoff2/build/compress_binding.js \
 	  /src/wawoff2/src/compress_binding.cc \
 	  /src/build/woff2-wasm/libwoff2enc.a \
 	  /src/build/woff2-wasm/libwoff2common.a \
 	  /src/build/brotli-wasm/libbrotlienc.a \
 	  /src/build/brotli-wasm/libbrotlicommon.a
 
-	emcc $(CARGS) -I/src/woff2/include/ \
+	emcc $(CARGS) $(UMDARGS) -I/src/woff2/include/ \
 	  -o /src/wawoff2/build/decompress_binding.js \
 	  /src/wawoff2/src/decompress_binding.cc \
 	  /src/build/woff2-wasm/libwoff2dec.a \
 	  /src/build/woff2-wasm/libwoff2common.a \
 	  /src/build/brotli-wasm/libbrotlidec.a \
 	  /src/build/brotli-wasm/libbrotlicommon.a
 
+	emcc $(CARGS) $(ES6ARGS) -I/src/woff2/include/ \
+	  -o /src/wawoff2/build/compress_binding.mjs \
+	  /src/wawoff2/src/compress_binding.cc \
+	  /src/build/woff2-wasm/libwoff2enc.a \
+	  /src/build/woff2-wasm/libwoff2common.a \
+	  /src/build/brotli-wasm/libbrotlienc.a \
+	  /src/build/brotli-wasm/libbrotlicommon.a
+
+	emcc $(CARGS) $(ES6ARGS) -I/src/woff2/include/ \
+	  -o /src/wawoff2/build/decompress_binding.mjs \
+	  /src/wawoff2/src/decompress_binding.cc \
+	  /src/build/woff2-wasm/libwoff2dec.a \
+	  /src/build/woff2-wasm/libwoff2common.a \
+	  /src/build/brotli-wasm/libbrotlidec.a \
+	  /src/build/brotli-wasm/libbrotlicommon.a
+
 	/src/build/woff2-native/woff2_compress $(FIXTURES)/sample.ttf
 	mv $(FIXTURES)/sample.woff2 $(FIXTURES)/sample_compressed.woff2