fix(deprecation): note that jetifier is deprecated, warn on translations

react-native CLI is in discussions to stop using jetifier by default, as
AndroidX transition should be done

index.js

@@ -11,6 +11,7 @@ const SEARCH_DIR = 'node_modules';
 const classesMapping = getClassesMapping();
 const files = readDir(SEARCH_DIR);
 
+console.warn('Jetifier is deprecated. Future versions of react-native CLI may not run it by default.')
 console.log(`Jetifier found ${files.length} file(s) to ${mode}-jetify. Using ${cpus} workers...`);
 
 for (const filesChunk of chunk(files, cpus)) {

src/worker.js

@@ -6,6 +6,7 @@ process.on('message', ({ filesChunk, classesMapping, mode }) => {
     let data = readFileSync(file, { encoding: 'utf8' });
     for (const [oldClass, newClass] of classesMapping) {
       if (data.includes(mode === 'forward' ? oldClass : newClass)) {
+        console.warn(`Jetifier: propose an AndroidX conversion PR to this repository: ${file}`)
         data = mode === 'forward' ?
           data.replace(new RegExp(oldClass, 'g'), newClass) :
           data.replace(new RegExp(newClass, 'g'), oldClass);