# ONNX Runtime JavaScript API

This directory contains multiple NPM projects:

- [onnxruntime-common](#onnxruntime-common)
- [onnxruntime-node](#onnxruntime-node)
- [onnxruntime-web](#onnxruntime-web)
- [onnxruntime-react-native](#onnxruntime-react-native)

### Development

This folder contains a `.vscode` folder for Visual Studio Code workspace configs. Using VSCode to open this folder
will allow code-formatting and linting features on typescript and C/C++ source code inside this folder. Following files
are used for code-formatting and linting features for developers:

- .vscode/\*\*
- package.json
- packages-lock.json
- .eslintrc.js
- .clang-format

#### Using VSCode:

1. in `<ORT_ROOT>/js`, run:
   > npm ci
2. use VSCode to open folder `<ORT_ROOT>/js`
3. install VSCode extension if not installed yet:
   - Clang-Format
   - ESLint

To populate typescript type declarations, in each projects, run `npm ci`.

#### Run code formatter and linter manually

in `<ORT_ROOT>/js`, use `npm run lint` to run ESLint , and use `npm run format` to run clang-format.

## onnxruntime-common

> language: typescript

> dependency:

> folder: <ORT_ROOT>/js/common

This project is designed to include all "common" code, which are pure javascript that can run in both Node.js and browsers.

### Requirements

Node.js v12+ (recommended v14+)

### Build

Use following command in folder `<ORT_ROOT>/js/common` to install NPM packages, build typescript files and generate bundles:

```
npm ci
```

### Distribution

It should be able to consumed by both from projects that uses NPM packages (through a Node.js folder structure of `node_modules` folder that generated by `npm install onnxruntime-common`) and from a CDN service that serves a `.min.js` bundle file.

### Features

Following features are included in `onnxruntime-common`:

- `InferenceSession` interfaces
- `Tensor`/`OnnxValue` interfaces, implementation and a set of utility functions
- `Backend` interfaces and a set of functions for backend registration

## onnxruntime-node

> language: typescript/C++

> dependency: onnxruntime-common, ONNXRuntime.dll

> folder: <ORT_ROOT>/js/node

This project is designed to be used as a NPM package to enable Node.js users to consume ONNX Runtime via Node.js binding, in Node.js or any Node.js compatible environment.

### Requirements

Node.js v12+ (recommended v14+)

### Build

#### Build ONNX Runtime and Node.js binding

Follow [instructions](https://www.onnxruntime.ai/docs/how-to/build.html#apis-and-language-bindings) for building ONNX Runtime Node.js binding

#### Build Node.js binding only

Use following command in folder `<ORT_ROOT>/js/node` to install NPM packages and build typescript files:

```
npm ci
```

This will download the latest pre-built ONNX Runtime binaries for the current platform.

### Distribution

It should be able to consumed by from projects that uses NPM packages (through a Node.js folder structure of `node_modules` folder that generated by `npm install onnxruntime-node`).

## onnxruntime-web

> language: typescript

> dependency: onnxruntime-common, ONNXRuntime WebAssembly

> folder: <ORT_ROOT>/js/web

This project is a library for running ONNX models on browsers. It is the successor of [ONNX.js](https://github.com/Microsoft/onnxjs).

### Requirements

Node.js v12+ (recommended v14+)

### Build

1. Install NPM packages

   1. in `<ORT_ROOT>/js/`, run `npm ci`.
   2. in `<ORT_ROOT>/js/common/`, run `npm ci`.
   3. in `<ORT_ROOT>/js/web/`, run `npm ci`.

2. ~~Follow [instructions](https://www.onnxruntime.ai/docs/how-to/build.html#apis-and-language-bindings) for building ONNX Runtime WebAssembly. (TODO: document is not ready. we are working on it.)~~

   in `<ORT_ROOT>/`, run either of the following commands to build WebAssembly:

   ```sh
   # In windows, use 'build' to replace './build.sh'

   # The following command build debug.
   ./build.sh --build_wasm

   # The following command build release.
   ./build.sh --config Release --build_wasm --skip_tests --disable_wasm_exception_catching --disable_rtti
   ```

   To build with multi-thread support, append flag ` --enable_wasm_threads` to the command.

3. Copy following files from build output folder to `<ORT_ROOT>/js/web/dist/`:

   - ort-wasm.wasm
   - ort-wasm-threaded.wasm (build with flag '--enable_wasm_threads')

4. Copy following files from build output folder to `<ORT_ROOT>/js/web/lib/wasm/binding/`:

   - ort-wasm.js
   - ort-wasm-threaded.js (build with flag '--enable_wasm_threads')
   - ort-wasm-threaded.worker.js (build with flag '--enable_wasm_threads')

5. Use following command in folder `<ORT_ROOT>/js/web` to build:
   ```
   npm run build
   ```

### Distribution

It should be able to consumed by both from projects that uses NPM packages (through a Node.js folder structure of `node_modules` folder that generated by `npm install onnxruntime-web`) and from a CDN service that serves a `.min.js` file and one or multiple `.wasm` file(s).

## onnxruntime-react-native

> language: typescript, java, objective-c

> dependency: onnxruntime-common

> folder: <ORT_ROOT>/js/react_native

This project provides an ONNX Runtime React Native JavaScript library to run ONNX models on React Native Android and iOS app.

### Requirements

- Yarn
- Android SDK and NDK, which can be installed via Android Studio or sdkmanager command line tool
- A Mac computer with the latest macOS
- [Xcode](https://developer.apple.com/xcode/)
- [CMake](https://cmake.org/download/)
- [Python 3](https://www.python.org/downloads/mac-osx/)

### Build

1. Install NPM packages for ONNX Runtime common JavaScript library and required React Native JavaScript libraries

   1. in `<ORT_ROOT>/js/`, run `npm ci`.
   2. in `<ORT_ROOT>/js/common/`, run `npm ci`.
   3. in `<ORT_ROOT>/js/react_native/`, run `yarn`.

2. Build Android ONNX Runtime package

   1. Set up an Android build environment referring to [instruction](https://www.onnxruntime.ai/docs/how-to/build.html#android)

   2. In `<ORT_ROOT>`, run this python script to build ONNX Runtime Android archive file. In windows, this requires admin account to build. If an app uses a fixed set of models, refer to [instruction](https://www.onnxruntime.ai/docs/how-to/build.html#android) and build a mobile version package
   ```python
   python tools/ci_build/github/android/build_aar_package.py js/react_native/scripts/aar_build_settings.json --config MinSizeRel --android_sdk_path <ANDROID_SDK_PATH> --android_ndk_path <ANDROID_NDK_PATH> --build_dir <BUILD_DIRECTORY>
   ```

   3. This generates `onnxruntime-mobile-<version>.aar` in `<BUILD_DIRECTORY>/aar_out/MinSizeRel/com/microsoft/onnxruntime/onnxruntime-mobile/<version>`. Copy `aar` file into `<ORT_ROOT>/js/react_native/android/libs` and rename it as `onnxruntime.aar`

   4. To verify, open Android Emulator and run this command from `<ORT_ROOT>/js/react_native/android`
   ```sh
   adb shell am instrument -w ai.onnxruntime.react_native.test/androidx.test.runner.AndroidJUnitRunner
   ```

3. Build iOS ONNX Runtime package

   1. Set up iOS build environment referring to [instruction](https://www.onnxruntime.ai/docs/how-to/build.html#ios).
   
   2. Build ONNX Runtime library for iOS from `<ORT_ROOT>` using this command,
   ```sh
   ./build.sh --config MinSizeRel --use_xcode --ios --ios_sysroot iphoneos --osx_arch arm64 --apple_deploy_target 11
   ```
   Copy `<ORT_ROOT>/build/iOS/MinSizeRel/MinSizeRel-iphoneos/libonnxruntime.<version>.dylib` file into `<ORT_ROOT>/js/react_native/ios/Libraries/onnxruntime/lib/iphoneos`

   3. Clean up the previous build and build ONNX Runtime library for iOS Simulator from `<ORT_ROOT>`
   ```sh
   ./build.sh --config MinSizeRel --use_xcode --ios --ios_sysroot iphonesimulator --osx_arch x86_64 --apple_deploy_target 11
   ```
   Copy `<ORT_ROOT>/build/iOS/MinSizeRel/MinSizeRel-iphonesimulator/libonnxruntime.<version>.dylib` file into `<ORT_ROOT>/js/react_native/ios/Libraries/onnxruntime/lib/iphonesimulator`
   
   4. Edit `onnxruntime-react-native.iphoneos.podspec` and `onnxruntime-react-native.iphonesimulator.podsepc` in `<ORT_ROOT>/js/react_native` to change a version of ONNX Runtime library.

   5. Copy ONNX Runtime header files
   ```sh
   cp <ORT_ROOT>/include/onnxruntime/core/session/*.h <ORT_ROOT>/js/react_native/ios/Libraries/onnxruntime/include
   ```

   6. To verify, open iOS Simulator and run this command from `<ORT_ROOT>/js/react_native/ios`. Change a destination to specify a running iOS Simulator.
       ```sh
       pod install
       export ONNXRUNTIME_VERSION=<version>; xcodebuild test -workspace OnnxruntimeModule.xcworkspace -scheme OnnxruntimeModuleTest -destination 'platform=iOS Simulator,name=iPhone 11,OS=14.5'
       ```

4. Update a version in `package.json` to align with ONNX Runtime version.

5. Test an example for Android and iOS. In Windows, open Android Emulator first. From `<ORT_ROOT>/js/react_native`
    ```sh
    yarn bootstrap
    yarn example ios
    yarn example android
    ```

### NPM Packaging

1. Update a version using `npm verison <version>` from `<ORT_ROOT>/js/react_native` folder. If it's for a dev, use `npm version <version>-dev.<subversion>`

2. Run `yarn prepack` to change `onnxruntime-common` to point to a published npm package

3. Run `npm pack` and verify NPM package contents

4. Run `npm publish <tgz> --dry-run` to see how it's going to be published

5. Run `npm publish <tgz>` to publish to npmjs

### Distribution

It should be able to consumed by React Native projects that uses Yarn packages through `yarn add onnxruntime-react-native`.