chore: import upstream snapshot with attribution

scripts/angular-support-upgrades/init-upgrade.ts

@@ -0,0 +1,67 @@
+#!/usr/bin/env node
+
+/**
+ * USAGE:
+ *
+ * Run the following command from the root of the workspace.
+ * Replace the versions with the correct target versions
+ *
+ * pnpm ts-node scripts/angular-support-upgrades/init-upgrade.ts --angularVersion=next --targetNxVersion=15.5.0 --targetNxMigrationVersion=15.5.0-beta.0
+ *
+ */
+import { execSync } from 'child_process';
+import { prerelease } from 'semver';
+import { buildMigrations } from './build-migrations';
+import { fetchVersionsFromRegistry } from './fetch-versions-from-registry';
+import { updatePackageDependencies } from './update-package-jsons';
+import { updateVersionUtils } from './update-version-utils';
+
+const yargs = require('yargs');
+const { hideBin } = require('yargs/helpers');
+const argv = yargs(hideBin(process.argv)).argv;
+
+if (
+  !argv.angularVersion &&
+  !argv.targetNxVersion &&
+  !argv.targetNxMigrationVersion
+) {
+  throw new Error(
+    'You need to provide --angularVersion=(latest|next) and --targetNxVersion=versionString and --targetNxMigrationVersion=versionString'
+  );
+}
+
+async function run() {
+  const packageVersionMap = await fetchVersionsFromRegistry(
+    argv.angularVersion
+  );
+
+  const isPrerelease =
+    prerelease(packageVersionMap.get('@angular/cli')!) !== null;
+  await updatePackageDependencies(packageVersionMap, isPrerelease);
+  await buildMigrations(
+    packageVersionMap,
+    argv.targetNxVersion,
+    argv.targetNxMigrationVersion,
+    isPrerelease
+  );
+  updateVersionUtils(packageVersionMap, isPrerelease);
+
+  console.log('⏳ - Installing packages...');
+  execSync('pnpm install', {
+    stdio: 'inherit',
+    encoding: 'utf8',
+
+    windowsHide: false,
+  });
+  console.log('✅ - Finished installing packages!');
+
+  console.log('⏳ - Formatting files...');
+  execSync('pnpm nx format', {
+    stdio: 'inherit',
+    encoding: 'utf8',
+    windowsHide: false,
+  });
+  console.log('✅ - Finished creating migrations!');
+}
+
+run();