Add a BUCK target (#48457)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/48457

Adding CI support will require executing through buck.  Sandboxing means the package has to be well-formed to work, so this cleans up some earlier mess.

- yarn workspace
- check-api.sh to configure the environment correctly when running form sandcastle
- explicity dependencies in our package.json

This is the first step

Changelog: [Internal]

Reviewed By: GijsWeterings

Differential Revision: D67726588

fbshipit-source-id: 7f8605695e323ef332550820b23b85d3af5f4d69

tools/api/check-api.sh

@@ -0,0 +1,92 @@
+#!/bin/bash
+# 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.
+
+set -e
+
+ERR_CODE_UNCOMMITTED_API_CHANGE=1
+ERR_CODE_CANT_FIND_PROJECT=2
+ERR_CODE_BAD_COMMIT=3
+
+WARNING_MESSAGE_HEADER=$(cat <<EOF
+🚨 React Native Public C++ / Objective-C / Objective-C++ API Change Detected:
+
+It looks like you've changed a public API that could affect our users, potentially breaking libraries and/or products using React Native.
+EOF
+)
+
+WARNING_MESSAGE_TAIL=$(cat <<EOF
+
+What to do now?
+---------------
+
+Nothing for now, we're just tracking this. In the future we'll start adding folks from React Org as reviewers to check these changes align with our public API policy.
+
+EOF
+)
+
+ERROR_MENTION_BREAKING_CHANGE=$(cat <<EOF
+
+Commit Message:
+---------------
+
+If you did not intend to change React Native's Public API, please revert those changes in this commit. If you did intend to change the Public API, You *MUST* add a changelog entry to your commit message using the "Breaking" type (https://reactnative.dev/contributing/changelogs-in-pull-requests). For example:
+
+## Changelog:
+[General][Breaking] - Removed the Foo method to Bar as part of our deprecation mentioned in RFC-123
+
+EOF
+)
+
+function check_if_mentions_breaking_change() {
+    IN_COMMIT_MESSAGE=$(sl log -r . -T '{desc}' | grep -iE '\[(android|ios|general|internal)\]\s*\[breaking\]' || true)
+    if [ -z "$IN_COMMIT_MESSAGE" ]; then
+        echo "$ERROR_MENTION_BREAKING_CHANGE"
+        exit $ERR_CODE_BAD_COMMIT
+    fi
+}
+
+FBSOURCE_ROOT="$(sl root)"
+
+# shellcheck source=xplat/js/env-utils/setup_env_base.sh
+source "$FBSOURCE_ROOT/xplat/js/env-utils/setup_env_base.sh"
+
+# Path to a version of clang and clang-format, these should be from a consistent version
+CLANG_PATH=$( \
+    buck2 targets --console=none --show-output fbcode//third-party-buck/platform010/build/llvm-fb/19:bin/clang \
+    | awk '{print $2}' \
+    | xargs dirname \
+)
+export PATH="$FBSOURCE_ROOT/$CLANG_PATH:$PATH"
+
+function cleanup() {
+    # shellcheck disable=SC2317
+    popd
+}
+
+pushd "$FBSOURCE_ROOT/xplat/js/react-native-github" || exit $ERR_CODE_CANT_FIND_PROJECT
+trap cleanup EXIT
+
+# TODO: This operates in the sandbox and can't modify files in the repository, which we need for change detection
+# buck2 run //xplat/js/react-native-github/tools/api:public-api
+(cd tools/api && $YARN_BINARY install)
+$NODE_BINARY tools/api/public-api.js
+echo
+
+API_FILE=$(grep -oP '(?<=output=)[^ \n]+' tools/api/public-api.conf)
+
+API_STATUS=$(sl status --no-status "$API_FILE")
+if [ -z "$API_STATUS" ]; then
+    echo "🎉 No public API changes, happy days!"
+    exit 0
+else
+    echo "$WARNING_MESSAGE_HEADER"
+
+    # Add any checks before showing the default warning
+    check_if_mentions_breaking_change
+
+    echo "$WARNING_MESSAGE_TAIL"
+    exit $ERR_CODE_UNCOMMITTED_API_CHANGE
+fi