Add Java to yarn format (#58466)

Summary: Pull Request resolved: https://github.com/react/react-native/pull/58466 Add `yarn format-java` and `yarn format-check-java` using the npm `google-java-format` package, which bundles google-java-format 1.23.0. This removes the Gradle build dependency and adds the offline package mirror and workspace lock entries. The wrapper discovers a suitable JDK when available and otherwise prints environment-specific Java 17 setup guidance before skipping Java. Changelog: [Internal] Reviewed By: javache Differential Revision: D119487613 fbshipit-source-id: e5ed299cc19f64bd5aceefd90c6160852be8ba37
2026-09-28 05:13:06 +08:00 · 2026-09-15 11:23:27 -07:00
parent fe0a20c5ff
commit c9c293d061
3 changed files with 160 additions and 2 deletions
@@ -0,0 +1,106 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @noflow
+ * @format
+ */
+
+'use strict';
+
+const {findJava, warnMissingJava} = require('./format-utils');
+const {spawnSync} = require('node:child_process');
+const fs = require('node:fs');
+const path = require('node:path');
+const {globSync} = require('tinyglobby');
+
+const REPO_ROOT = path.resolve(__dirname, '..');
+const GENERATED_MARKER = Buffer.from('@' + 'generated');
+const MINIMUM_JAVA_VERSION = 17;
+const MAX_FILES_PER_PROCESS = 30;
+const MAX_HEADER_BYTES = 4096;
+const IGNORE = [
+  '**/Pods/**',
+  '**/build/**',
+  '**/com/facebook/yoga/**',
+  '**/node_modules/**',
+];
+
+function isGenerated(file) {
+  let fd;
+  try {
+    fd = fs.openSync(path.resolve(REPO_ROOT, file), 'r');
+    const header = Buffer.alloc(MAX_HEADER_BYTES);
+    const bytesRead = fs.readSync(fd, header, 0, header.length, 0);
+    return header.subarray(0, bytesRead).includes(GENERATED_MARKER);
+  } catch (error) {
+    const message = error instanceof Error ? error.message : String(error);
+    throw new Error(`Unable to inspect ${file}: ${message}`, {cause: error});
+  } finally {
+    if (fd != null) {
+      fs.closeSync(fd);
+    }
+  }
+}
+
+function findGoogleJavaFormatJar() {
+  const packageRoot = path.dirname(
+    require.resolve('google-java-format/package.json'),
+  );
+  const jars = fs
+    .readdirSync(path.join(packageRoot, 'lib'))
+    .filter(file => file.endsWith('-all-deps.jar'));
+  if (jars.length !== 1) {
+    throw new Error(
+      `Expected one google-java-format jar, found ${jars.length}.`,
+    );
+  }
+  return path.join(packageRoot, 'lib', jars[0]);
+}
+
+function main() {
+  const check = process.argv[2] === '--check';
+  const java = findJava(MINIMUM_JAVA_VERSION);
+  if (java == null) {
+    warnMissingJava('Java');
+    return;
+  }
+  const googleJavaFormatJar = findGoogleJavaFormatJar();
+  const files = globSync('**/*.java', {cwd: REPO_ROOT, ignore: IGNORE}).filter(
+    file => !isGenerated(file),
+  );
+
+  let exitStatus = 0;
+  for (let i = 0; i < files.length; i += MAX_FILES_PER_PROCESS) {
+    const result = spawnSync(
+      java,
+      [
+        '--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED',
+        '--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED',
+        '--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED',
+        '--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED',
+        '--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED',
+        '--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED',
+        '-jar',
+        googleJavaFormatJar,
+        ...(check ? ['--dry-run', '--set-exit-if-changed'] : ['--replace']),
+        ...files.slice(i, i + MAX_FILES_PER_PROCESS),
+      ],
+      {cwd: REPO_ROOT, stdio: 'inherit'},
+    );
+    if (result.error != null) {
+      throw result.error;
+    }
+    if (result.signal != null) {
+      throw new Error(`google-java-format was terminated by ${result.signal}`);
+    }
+    if (result.status !== 0) {
+      exitStatus = result.status ?? 1;
+    }
+  }
+  process.exitCode = exitStatus;
+}
+
+main();