fix(init): allow for spec on scope-only arg (#5206)

Author: wraithgar

docs/content/commands/npm-init.md

@@ -38,6 +38,8 @@ follows:
 * `npm init foo` -> `npm exec create-foo`
 * `npm init @usr/foo` -> `npm exec @usr/create-foo`
 * `npm init @usr` -> `npm exec @usr/create`
+* `npm init @usr@2.0.0` -> `npm exec @usr/create@2.0.0`
+* `npm init @usr/foo@2.0.0` -> `npm exec @usr/create-foo@2.0.0`
 
 If the initializer is omitted (by just calling `npm init`), init will fall
 back to legacy init behavior. It will ask you a bunch of questions, and

lib/commands/init.js

@@ -85,8 +85,13 @@ class Init extends BaseCommand {
     const [initerName, ...otherArgs] = args
     let packageName = initerName
 
+    // Only a scope, possibly with a version
     if (/^@[^/]+$/.test(initerName)) {
-      packageName = initerName + '/create'
+      const [, scope, version] = initerName.split('@')
+      packageName = `@${scope}/create`
+      if (version) {
+        packageName = `${packageName}@${version}`
+      }
     } else {
       const req = npa(initerName)
       if (req.type === 'git' && req.hosted) {

test/lib/commands/init.js

@@ -136,6 +136,44 @@ t.test('npm init @scope/name', async t => {
   await init.exec(['@npmcli/something'])
 })
 
+t.test('npm init @scope@spec', async t => {
+  t.plan(1)
+  npm.localPrefix = t.testdir({})
+
+  const Init = t.mock('../../../lib/commands/init.js', {
+    libnpmexec: ({ args }) => {
+      t.same(
+        args,
+        ['@npmcli/create@foo'],
+        'should npx with scoped packages'
+      )
+    },
+  })
+  const init = new Init(npm)
+
+  process.chdir(npm.localPrefix)
+  await init.exec(['@npmcli@foo'])
+})
+
+t.test('npm init @scope/name@spec', async t => {
+  t.plan(1)
+  npm.localPrefix = t.testdir({})
+
+  const Init = t.mock('../../../lib/commands/init.js', {
+    libnpmexec: ({ args }) => {
+      t.same(
+        args,
+        ['@npmcli/create-something@foo'],
+        'should npx with scoped packages'
+      )
+    },
+  })
+  const init = new Init(npm)
+
+  process.chdir(npm.localPrefix)
+  await init.exec(['@npmcli/something@foo'])
+})
+
 t.test('npm init git spec', async t => {
   t.plan(1)
   npm.localPrefix = t.testdir({})