fix: init uses yarn assuming version > 1.x

- Checks that we're using yarn > 1.x when calling `yarn set` which isn't
supported [1] but is for later versions [2].
- Update tests to support
environment change differences between yarn 1.x & 3.x.
- Fix glob.sync to only use forward slashes.

[1] https://classic.yarnpkg.com/en/docs/cli/set
[2] https://yarnpkg.com/cli/set/version
[3] https://github.com/mrmlnc/fast-glob#how-to-write-patterns-on-windows

__e2e__/init.test.ts

@@ -1,11 +1,20 @@
 import fs from 'fs';
 import path from 'path';
 import {runCLI, getTempDirectory, cleanup, writeFiles} from '../jest/helpers';
+import {execSync} from 'child_process';
+import semver from 'semver';
 import slash from 'slash';
 
 const DIR = getTempDirectory('command-init');
 const PROJECT_NAME = 'TestInit';
 
+const yarnVersion = semver.parse(execSync('yarn --version').toString().trim())!;
+
+const yarnConfigFiles: string[] = [];
+if (yarnVersion.major >= 3) {
+  yarnConfigFiles.push('.yarnrc.yml', '.yarn');
+}
+
 function createCustomTemplateFiles() {
   writeFiles(DIR, {
     'custom/template/template.config.js': `module.exports = {
@@ -22,8 +31,7 @@ function createCustomTemplateFiles() {
 
 const customTemplateCopiedFiles = [
   '.git',
-  '.yarn',
-  '.yarnrc.yml',
+  ...yarnConfigFiles,
   'dir',
   'file',
   'node_modules',
@@ -177,8 +185,7 @@ test('init uses npm as the package manager with --npm', () => {
 
   // Remove yarn specific files and node_modules
   const filteredFiles = customTemplateCopiedFiles.filter(
-    (file) =>
-      !['yarn.lock', 'node_modules', '.yarnrc.yml', '.yarn'].includes(file),
+    (file) => !['yarn.lock', 'node_modules', ...yarnConfigFiles].includes(file),
   );
 
   // Add package-lock.json

jest/helpers.ts

@@ -45,7 +45,7 @@ export const makeTemplate =
     });
 
 export const cleanup = (directory: string) => {
-  fs.rmSync(directory, {recursive: true, force: true});
+  fs.rmSync(directory, {recursive: true, force: true, maxRetries: 10});
 };
 
 /**
@@ -142,18 +142,18 @@ function getExecaOptions(options: SpawnOptions) {
 function handleTestFailure(
   cmd: string,
   options: SpawnOptions,
-  result: {[key: string]: any},
+  result: execa.ExecaReturnBase<string>,
   args: string[] | undefined,
 ) {
-  if (!options.expectedFailure && result.code !== 0) {
+  if (!options.expectedFailure && result.exitCode !== 0) {
     console.log(`Running ${cmd} command failed for unexpected reason. Here's more info:
 ${chalk.bold('cmd:')}     ${cmd}
 ${chalk.bold('options:')} ${JSON.stringify(options)}
 ${chalk.bold('args:')}    ${(args || []).join(' ')}
 ${chalk.bold('stderr:')}  ${result.stderr}
 ${chalk.bold('stdout:')}  ${result.stdout}
-${chalk.bold('code:')}    ${result.code}`);
-  } else if (options.expectedFailure && result.code === 0) {
+${chalk.bold('exitCode:')}${result.exitCode}`);
+  } else if (options.expectedFailure && result.exitCode === 0) {
     throw new Error("Expected command to fail, but it didn't");
   }
 }

packages/cli-platform-android/src/config/findManifest.ts

@@ -11,7 +11,7 @@ import path from 'path';
 import {unixifyPaths} from '@react-native-community/cli-tools';
 
 export default function findManifest(folder: string) {
-  let manifestPaths = glob.sync(path.join('**', 'AndroidManifest.xml'), {
+  let manifestPaths = glob.sync('**/AndroidManifest.xml', {
     cwd: unixifyPaths(folder),
     ignore: [
       'node_modules/**',

packages/cli/src/commands/init/init.ts

@@ -83,7 +83,8 @@ const bumpYarnVersion = async (silent: boolean, root: string) => {
   try {
     let yarnVersion = semver.parse(getYarnVersionIfAvailable());
 
-    if (yarnVersion) {
+    // `yarn set` is unsupported in 1.x
+    if (yarnVersion && yarnVersion.major > 1) {
       await executeCommand('yarn', ['set', 'version', YARN_VERSION], {
         root,
         silent,