Add WebAssembly for NodeJS. (#628)

wasm/nodejs/CMakeLists.txt

@@ -0,0 +1,76 @@
+if(NOT $ENV{SHERPA_ONNX_IS_USING_BUILD_WASM_SH})
+  message(FATAL_ERROR "Please use ./build-wasm-simd-nodejs.sh to build for wasm NodeJS")
+endif()
+
+set(exported_functions
+  #tts
+  PrintOfflineTtsConfig
+  SherpaOnnxCreateOfflineTts
+  SherpaOnnxDestroyOfflineTts
+  SherpaOnnxDestroyOfflineTtsGeneratedAudio
+  SherpaOnnxOfflineTtsGenerate
+  SherpaOnnxOfflineTtsGenerateWithCallback
+  SherpaOnnxOfflineTtsNumSpeakers
+  SherpaOnnxOfflineTtsSampleRate
+  SherpaOnnxWriteWave
+  # streaming asr
+  AcceptWaveform
+  CreateOnlineRecognizer
+  CreateOnlineStream
+  DecodeOnlineStream
+  DestroyOnlineRecognizer
+  DestroyOnlineRecognizerResult
+  DestroyOnlineStream
+  GetOnlineStreamResult
+  InputFinished
+  IsEndpoint
+  IsOnlineStreamReady
+  Reset
+  # non-streaming ASR
+  PrintOfflineRecognizerConfig
+  CreateOfflineRecognizer
+  DestroyOfflineRecognizer
+  CreateOfflineStream
+  DestroyOfflineStream
+  AcceptWaveformOffline
+  DecodeOfflineStream
+  DecodeMultipleOfflineStreams
+  GetOfflineStreamResult
+  DestroyOfflineRecognizerResult
+)
+
+
+set(mangled_exported_functions)
+foreach(x IN LISTS exported_functions)
+  list(APPEND mangled_exported_functions "_${x}")
+endforeach()
+list(JOIN mangled_exported_functions "," all_exported_functions)
+
+include_directories(${CMAKE_SOURCE_DIR})
+set(MY_FLAGS " -s FORCE_FILESYSTEM=1 -s INITIAL_MEMORY=512MB -s ALLOW_MEMORY_GROWTH=1")
+string(APPEND MY_FLAGS " -sSTACK_SIZE=10485760 ") # 10MB
+string(APPEND MY_FLAGS " -sEXPORTED_FUNCTIONS=[_CopyHeap,_malloc,_free,${all_exported_functions}] ")
+string(APPEND MY_FLAGS " -sEXPORTED_RUNTIME_METHODS=['ccall','stringToUTF8','setValue','getValue'] ")
+string(APPEND MY_FLAGS " -sNODERAWFS=1 ")
+string(APPEND MY_FLAGS " -sEXPORTED_RUNTIME_METHODS=['ccall','stringToUTF8','setValue','getValue','lengthBytesUTF8','UTF8ToString'] ")
+string(APPEND MY_FLAGS " -sMODULARIZE=1 -sWASM_ASYNC_COMPILATION=0 ")
+
+message(STATUS "MY_FLAGS: ${MY_FLAGS}")
+
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${MY_FLAGS}")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${MY_FLAGS}")
+set(CMAKE_EXECUTBLE_LINKER_FLAGS "${CMAKE_EXECUTBLE_LINKER_FLAGS} ${MY_FLAGS}")
+
+add_executable(sherpa-onnx-wasm-nodejs sherpa-onnx-wasm-nodejs.cc)
+target_link_libraries(sherpa-onnx-wasm-nodejs sherpa-onnx-core sherpa-onnx-c-api)
+install(TARGETS sherpa-onnx-wasm-nodejs DESTINATION bin/wasm/nodejs)
+
+install(
+  FILES
+  ${CMAKE_SOURCE_DIR}/wasm/asr/sherpa-onnx-asr.js
+  ${CMAKE_SOURCE_DIR}/wasm/tts/sherpa-onnx-tts.js
+    "$<TARGET_FILE_DIR:sherpa-onnx-wasm-nodejs>/sherpa-onnx-wasm-nodejs.js"
+    "$<TARGET_FILE_DIR:sherpa-onnx-wasm-nodejs>/sherpa-onnx-wasm-nodejs.wasm"
+  DESTINATION
+    bin/wasm/nodejs
+)