cli: add build-workspace command

packages/cli/src/commands/buildWorkspace.ts

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import fs from 'fs-extra';
+import { Command } from 'commander';
+import { createDistWorkspace } from '../lib/packager';
+
+export default async (dir: string, _cmd: Command, packages: string[]) => {
+  if (!(await fs.pathExists(dir))) {
+    throw new Error(`Target workspace directory doesn't exist, '${dir}'`);
+  }
+
+  await createDistWorkspace(packages, {
+    targetDir: dir,
+  });
+};

packages/cli/src/index.ts

@@ -140,6 +140,11 @@ const main = (argv: string[]) => {
     .description('Delete cache directories')
     .action(lazyAction(() => import('./commands/clean/clean'), 'default'));
 
+  program
+    .command('build-workspace <workspace-dir> ...<packages>')
+    .description('Builds a temporary dist workspace from the provided packages')
+    .action(lazyAction(() => import('./commands/buildWorkspace'), 'default'));
+
   program.on('command:*', () => {
     console.log();
     console.log(

packages/cli/src/lib/packager/index.ts

@@ -59,7 +59,7 @@ type Options = {
  */
 export async function createDistWorkspace(
   packageNames: string[],
-  options: Options,
+  options: Options = {},
 ) {
   const targetDir =
     options.targetDir ??