refactor(react-property): update build-injection to output .js

The `.json` format leads to a larger file size due to the quotes
around the property keys.

packages/react-property/scripts/build-injection.js

@@ -1,7 +1,8 @@
 const fs = require('fs');
 const path = require('path');
+const prettier = require('prettier');
 const DOMProperty = require('react-dom/lib/DOMProperty');
-const { LIB_DIR } = require('./constants');
+const { LIB_DIR, PRETTIER_OPTIONS } = require('./constants');
 
 /**
  * Create output directory (if it doesn't exist).
@@ -13,6 +14,9 @@ try {
 }
 
 fs.writeFileSync(
-  path.resolve(LIB_DIR, 'injection.json'),
-  JSON.stringify(DOMProperty.injection)
+  path.resolve(LIB_DIR, 'injection.js'),
+  prettier.format(
+    'module.exports=' + JSON.stringify(DOMProperty.injection),
+    PRETTIER_OPTIONS
+  )
 );