Add script to sync engines with core version

scripts/update-engines.js

@@ -0,0 +1,25 @@
+const fs = require('fs');
+const path = require('path');
+const exec = require('child_process').execSync;
+
+let packages = JSON.parse(
+  exec(
+    `${path.join(__dirname, '..', 'node_modules', '.bin', 'lerna')} ls  --json`,
+  ),
+);
+let packageVersions = new Map(
+  packages.map(pkg => [
+    pkg.name,
+    {version: pkg.version, location: pkg.location},
+  ]),
+);
+let coreVersion = packageVersions.get('@parcel/core').version;
+
+for (let [, {location}] of packageVersions) {
+  let pkgPath = path.join(location, 'package.json');
+  let pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));
+  if (pkg.engines?.parcel != null) {
+    pkg.engines.parcel = coreVersion;
+    fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + '\n');
+  }
+}