use dynamic paths for android builds

Author: stevensJourney

tools/powersynctests/android/app/build.gradle

@@ -8,14 +8,12 @@ apply plugin: "com.facebook.react"
  */
 react {
     /* Folders */
-    codegenDir = file("../../../../node_modules/@react-native/codegen")
 
     //   The root of your project, i.e. where "package.json" lives. Default is '../..'
     // root = file("../../")
-    //   The folder where the react-native NPM package is. Default is ../../node_modules/react-native
-    // reactNativeDir = file("../../node_modules/react-native")
-    //   The folder where the react-native Codegen package is. Default is ../../node_modules/@react-native/codegen
-    // codegenDir = file("../../node_modules/@react-native/codegen")
+    //   Resolve react-native and codegen from the monorepo root using node's resolution
+    reactNativeDir = new File(["node", "--print", "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim()).getParentFile().getAbsoluteFile()
+    codegenDir = new File(["node", "--print", "require.resolve('@react-native/codegen/package.json', { paths: [require.resolve('react-native/package.json')] })"].execute(null, rootDir).text.trim()).getParentFile().getAbsoluteFile()
     //   The cli.js file which is the React Native CLI entrypoint. Default is ../../node_modules/react-native/cli.js
     // cliFile = file("../../node_modules/react-native/cli.js")
 
@@ -47,7 +45,7 @@ react {
 
     /* Hermes Commands */
     //   The hermes compiler command to run. By default it is 'hermesc'
-    // hermesCommand = "$rootDir/my-custom-hermesc/bin/hermesc"
+    hermesCommand = new File(["node", "--print", "require.resolve('react-native/package.json')"].execute(null, rootDir).text.trim()).getParentFile().getAbsolutePath() + "/sdks/hermesc/%OS-BIN%/hermesc"
     //
     //   The list of flags to pass to the Hermes compiler. By default is "-O", "-output-source-map"
     // hermesFlags = ["-O", "-output-source-map"]