[js/rn] add expo config plugin support (microsoft#11556)

* [js/rn] add expo config plugin support

* resolve comments

js/react_native/app.plugin.js

@@ -0,0 +1,53 @@
+const configPlugin = require('@expo/config-plugins');
+const generateCode = require('@expo/config-plugins/build/utils/generateCode');
+const pkg = require('onnxruntime-react-native/package.json');
+const path = require('path');
+const fs = require('fs');
+
+const withOrt = (config) => {
+  // Add build dependency to gradle file
+  config = configPlugin.withAppBuildGradle(config, (config) => {
+    if (config.modResults.language === 'groovy') {
+      config.modResults.contents = generateCode
+                                       .mergeContents({
+                                         src: config.modResults.contents,
+                                         newSrc: '    implementation project(\':onnxruntime-react-native\')',
+                                         tag: 'onnxruntime-react-native',
+                                         anchor: /^dependencies[ \t]*\{$/,
+                                         offset: 1,
+                                         comment: '    // onnxruntime-react-native'
+                                       })
+                                       .contents;
+    } else {
+      throw new Error('Cannot add ONNX Runtime maven gradle because the build.gradle is not groovy');
+    }
+
+    return config;
+  });
+
+  // Add build dependency to pod file
+  config = configPlugin.withDangerousMod(config, [
+    'ios',
+    (config) => {
+      const podFilePath = path.join(config.modRequest.platformProjectRoot, 'PodFile');
+      const contents = fs.readFileSync(podFilePath, {encoding: 'utf-8'});
+      const updatedContents =
+          generateCode
+              .mergeContents({
+                src: contents,
+                newSrc: '  pod \'onnxruntime-react-native\', :path => \'../node_modules/onnxruntime-react-native\'',
+                tag: 'onnxruntime-react-native',
+                anchor: /^target.+do$/,
+                offset: 1,
+                comment: '  # onnxruntime-react-native'
+              })
+              .contents;
+      fs.writeFileSync(podFilePath, updatedContents);
+      return config;
+    }
+  ]);
+
+  return config;
+};
+
+exports.default = configPlugin.createRunOncePlugin(withOrt, pkg.name, pkg.version)

js/react_native/package.json

@@ -48,6 +48,8 @@
     "ios/*.h",
     "ios/*.mm",
     "onnxruntime-react-native.podspec",
+    "app.plugin.js",
+    "unimodule.json",
     "!dist/commonjs/*.js.map",
     "!dist/module/*.js.map",
     "!android/.gitignore",
@@ -75,6 +77,7 @@
     "output": "dist"
   },
   "dependencies": {
+    "@expo/config-plugins": "^4.1.5",
     "buffer": "^6.0.3",
     "onnxruntime-common": "file:../common"
   },

js/react_native/unimodule.json

@@ -0,0 +1,4 @@
+{
+    "name": "onnxruntime-react-native",
+    "platforms": ["ios", "android"]
+}