Fix npm publish.

Author: koculu

packages/purestack/src/init/init.test.ts

@@ -597,6 +597,27 @@ describe('project generation', () => {
     expect(git).not.toHaveBeenCalled()
   })
 
+  it.each([
+    ['npm 11 list', [{ filename: 'template.tgz' }]],
+    ['npm 12 map', { '@scope/template': { filename: 'template.tgz' } }],
+  ])('reads the archive from the %s pack output', async (_format, output) => {
+    vi.spyOn(processes, 'runNpm').mockResolvedValue(JSON.stringify(output))
+    expect(await fetchTemplate('starter', temporary, repository)).toBe(
+      path.join(temporary, 'template.tgz'),
+    )
+  })
+
+  it.each([
+    ['no entries', []],
+    ['several entries', { a: { filename: 'a.tgz' }, b: { filename: 'b.tgz' } }],
+    ['a missing filename', { '@scope/template': { name: 'x' } }],
+  ])('rejects pack output with %s', async (_case, output) => {
+    vi.spyOn(processes, 'runNpm').mockResolvedValue(JSON.stringify(output))
+    await expect(
+      fetchTemplate('starter', temporary, repository),
+    ).rejects.toThrow('npm did not return a template archive.')
+  })
+
   it('rejects npm pack results pointing outside the temporary directory', async () => {
     vi.spyOn(processes, 'runNpm').mockResolvedValue(
       JSON.stringify([{ filename: '../outside.tgz' }]),

packages/purestack/src/init/template.ts

@@ -85,14 +85,17 @@ export async function fetchTemplate(
       { capture: true, signal },
     ),
   )
-  if (
-    !Array.isArray(result) ||
-    result.length !== 1 ||
-    typeof result[0]?.filename !== 'string'
-  ) {
+  // npm 11 and earlier report a list; npm 12 keys each entry by package name.
+  const packed = Array.isArray(result)
+    ? result
+    : isRecord(result)
+      ? Object.values(result)
+      : []
+  const filename = isRecord(packed[0]) ? packed[0].filename : undefined
+  if (packed.length !== 1 || typeof filename !== 'string') {
     throw new Error('npm did not return a template archive.')
   }
-  const archive = path.resolve(temporary, result[0].filename)
+  const archive = path.resolve(temporary, filename)
   if (path.dirname(archive) !== temporary || !archive.endsWith('.tgz')) {
     throw new Error('npm returned an invalid template archive path.')
   }