cli: add baseVersion option to new command

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

package.json

@@ -23,7 +23,7 @@
     "lint:all": "backstage-cli repo lint",
     "lint:type-deps": "node scripts/check-type-dependencies.js",
     "docker-build": "yarn tsc && yarn workspace example-backend build --build-dependencies && yarn workspace example-backend build-image",
-    "new": "backstage-cli new --scope backstage --no-private",
+    "new": "backstage-cli new --scope backstage --baseVersion 0.0.0 --no-private",
     "create-plugin": "echo \"use 'yarn new' instead\"",
     "release": "node scripts/prepare-release.js && changeset version && yarn diff --yes && yarn prettier --write '{packages,plugins}/*/{package.json,CHANGELOG.md}' '.changeset/*.json' && yarn install --no-immutable",
     "prettier:check": "prettier --check .",

packages/cli/cli-report.md

@@ -179,6 +179,7 @@ Options:
   --option <name>=<value>
   --scope <scope>
   --npm-registry <URL>
+  --baseVersion <version>
   --no-private
   -h, --help
 ```

packages/cli/src/commands/index.ts

@@ -218,6 +218,10 @@ export function registerCommands(program: Command) {
       '--npm-registry <URL>',
       'The package registry to use for new packages',
     )
+    .option(
+      '--baseVersion <version>',
+      'The version to use for any new packages (default: 0.1.0)',
+    )
     .option('--no-private', 'Do not mark new packages as private')
     .action(lazy(() => import('./new/new').then(m => m.default)));
 

packages/cli/src/commands/new/new.ts

@@ -51,17 +51,15 @@ export default async (opts: OptionValues) => {
   );
 
   let defaultVersion = '0.1.0';
-  try {
-    const rootLernaJson = await fs.readJson(
-      paths.resolveTargetRoot('lerna.json'),
-    );
-    if (rootLernaJson.version) {
-      defaultVersion = rootLernaJson.version;
-    }
-  } catch (error) {
-    assertError(error);
-    if (error.code !== 'ENOENT') {
-      throw error;
+  if (opts.baseVersion) {
+    defaultVersion = opts.baseVersion;
+  } else {
+    const lernaVersion = await fs
+      .readJson(paths.resolveTargetRoot('lerna.json'))
+      .then(pkg => pkg.version)
+      .catch(() => undefined);
+    if (lernaVersion) {
+      defaultVersion = lernaVersion;
     }
   }