feat: workspaces support (#226)

Author: wesleytodd

index.js

@@ -115,6 +115,14 @@ function initOpts () {
         }
       },
 
+      workspaces: {
+        type: 'string',
+        prompt: {
+          message: 'Workspaces:',
+          filter: parseList
+        }
+      },
+
       type: {
         type: 'string',
         prompt: {
@@ -301,6 +309,11 @@ async function format (opts, packageInstance) {
     pkg.scripts = { ...(pkg.scripts || {}), ...opts.scripts };
   }
 
+  // Workspaces
+  if (Array.isArray(opts.workspaces) && opts.workspaces.length) {
+    pkg.workspaces = opts.workspaces;
+  }
+
   // TODO: to test the empty string, we need to stub git.author()
   pkg.author = opts.author || '';
   pkg.license = opts.license;

test/index.js

@@ -56,10 +56,11 @@ suite('create-package-json', () => {
           assert.strictEqual(prompts[4].name, 'repository');
           assert.strictEqual(prompts[5].name, 'keywords');
           assert.strictEqual(prompts[6].name, 'license');
-          assert.strictEqual(prompts[7].name, 'type');
-          assert.strictEqual(prompts[8].name, 'main');
-          assert.strictEqual(prompts[9].name, 'dependencies');
-          assert.strictEqual(prompts[10].name, 'devDependencies');
+          assert.strictEqual(prompts[7].name, 'workspaces');
+          assert.strictEqual(prompts[8].name, 'type');
+          assert.strictEqual(prompts[9].name, 'main');
+          assert.strictEqual(prompts[10].name, 'dependencies');
+          assert.strictEqual(prompts[11].name, 'devDependencies');
 
           // Set defaults from prompts
           const out = await Promise.all(prompts.map(async (p) => {
@@ -262,6 +263,46 @@ suite('create-package-json', () => {
     });
   });
 
+  suite('scaffold workspaces', () => {
+    test('workspaces input', async () => {
+      await fix.setup();
+      // Empty array is invalid according to npm
+      const pkg1 = await createPackageJson({
+        workspaces: []
+      });
+      assert.deepStrictEqual(pkg1.workspaces, undefined);
+
+      await fix.setup();
+      const pkg2 = await createPackageJson({
+        workspaces: ['./lib']
+      });
+      assert.deepStrictEqual(pkg2.workspaces, ['./lib']);
+
+      await fix.setup();
+      const pkg3 = await createPackageJson({
+        workspaces: ['./lib/a', './lib/b']
+      });
+      assert.deepStrictEqual(pkg3.workspaces, ['./lib/a', './lib/b']);
+    });
+
+    test('workspaces prompts', async () => {
+      await fix.setup();
+      const pkg1 = await createPackageJson();
+      assert.deepStrictEqual(pkg1.workspaces, undefined);
+
+      const pkg2 = await createPackageJson({}, {
+        promptor: () => {
+          return async (prompts) => {
+            return {
+              workspaces: ['./lib/a', './lib/b']
+            };
+          };
+        }
+      });
+      assert.deepStrictEqual(pkg2.workspaces, ['./lib/a', './lib/b']);
+    });
+  });
+
   suite('npm init', () => {
     test('parity', async () => {
       await fix.setup();