always proxy to @react-native-community/cli (facebook#45464)

Summary:
Pull Request resolved: facebook#45464

Previous work would cause versions >= react-native 0.76 to exit if called through `npx react-native <cmd>`. This was intended to be full deprecated and removed.  The intention was to shift users to calling react-native-community/cli directly.

This change allows commands to be proxied to react-native-community/cli but with no guarantees of success.  It's up to each framework / project to explicitly create that dependency.

This also  provides warnings, which won't go away, suggesting the supported method of calling the community CLI directly.

The outcome is that we're not going to break existing workflows.

closes: facebook#45461

Changelog: [General][Fixed] allow proxying commands from react-native to react-native-community/cli with explicit warning

Differential Revision: D59805357

packages/react-native/cli.js

@@ -22,6 +22,13 @@ const deprecated = () => {
   );
 };
 
+function isMissingCliDependency(error) {
+  return (
+    error.code === 'MODULE_NOT_FOUND' &&
+    /@react-native-community\/cli/.test(error.message)
+  );
+}
+
 let cli = {
   bin: '/dev/null',
   loadConfig: deprecated,
@@ -107,17 +114,30 @@ The behavior will be changed on ${chalk.white.bold(CLI_DEPRECATION_DATE.toLocale
 }
 
 function warnWithDeprecated() {
-  if (process.argv[2] !== 'init') {
+  if (!isInitCommand) {
     return;
   }
 
   console.warn(`
-${chalk.yellow('⚠')}️ The \`init\` command is deprecated.
+${chalk.yellow('🚨')}️ The \`init\` command is deprecated.
 
 - Switch to ${chalk.dim('npx @react-native-community/cli init')} for the identical behavior.
 - Refer to the documentation for information about alternative tools: ${chalk.dim('https://reactnative.dev/docs/getting-started')}`);
 }
 
+function warnWithExplicitDependency(version = '*') {
+  console.warn(`
+${chalk.yellow('⚠')}️ ${chalk.dim('react-native')} depends on ${chalk.dim('@react-native-community/cli')} for cli commands. To fix update your ${chalk.dim('package.json')} to include:
+
+${chalk.white.bold(`
+  "devDependencies": {
+    "@react-native-community/cli": "latest",
+  }
+`)}
+
+`);
+}
+
 /**
  * npx react-native -> @react-native-community/cli
  *
@@ -157,24 +177,36 @@ async function main() {
     currentVersion.startsWith('0.76');
 
   /**
-   * This command now fails as it's fully deprecated. It will be entirely removed in 0.77.
+   * This command is now deprecated. We will continue to proxy commands to @react-native-community/cli, but it
+   * isn't supported anymore. We'll always show the warning.
+   *
+   * WARNING: Projects will have to have an explicit dependency on @react-native-community/cli to use the CLI.
    *
    * Phase 3
    *
    * @see https://github.com/react-native-community/discussions-and-proposals/tree/main/proposals/0759-react-native-frameworks.md
    */
-  if (currentVersion !== HEAD && isDeprecated) {
-    warnWithDeprecated();
-    process.exit(1);
+  if (isInitCommand) {
+    if (currentVersion !== HEAD && isDeprecated) {
+      warnWithDeprecated();
+      // We only exit if the user calls `init` and it's deprecated. All other cases should proxy to to @react-native-community/cli.
+      // Be careful with this as it can break a lot of users.
+      process.exit(1);
+    } else if (currentVersion.startsWith('0.75')) {
+      warnWithDeprecationSchedule();
+    }
+    warnWhenRunningInit();
   }
 
-  if (currentVersion.startsWith('0.75')) {
-    warnWithDeprecationSchedule();
+  try {
+    return require('@react-native-community/cli').run(name);
+  } catch (e) {
+    if (isMissingCliDependency(e)) {
+      warnWithExplicitDependency();
+      process.exit(1);
+    }
+    throw e;
   }
-
-  warnWhenRunningInit();
-
-  return require('@react-native-community/cli').run(name);
 }
 
 if (require.main === module) {
@@ -185,10 +217,7 @@ if (require.main === module) {
   } catch (e) {
     // We silence @react-native-community/cli missing as it is no
     // longer a dependency
-    if (
-      !e.code === 'MODULE_NOT_FOUND' &&
-      /@react-native-community\/cli/.test(e.message)
-    ) {
+    if (!isMissingCliDependency(e)) {
       throw e;
     }
   }