fix: handle mocking composables that use default export

src/vitest-environment-nuxt/modules/mock.ts

@@ -261,11 +261,19 @@ export default defineNuxtModule({
                     )}) } }`,
                   ]
                   for (const mock of mocks) {
-                    lines.push(
-                      `  mocks[${JSON.stringify(from)}][${JSON.stringify(
-                        mock.name
-                      )}] = await (${mock.factory})()`
-                    )
+                    if (mock.import.name === 'default') {
+                      lines.push(
+                        `  mocks[${JSON.stringify(from)}]["default"] = await (${
+                          mock.factory
+                        })()`
+                      )
+                    } else {
+                      lines.push(
+                        `  mocks[${JSON.stringify(from)}][${JSON.stringify(
+                          mock.name
+                        )}] = await (${mock.factory})()`
+                      )
+                    }
                   }
                   lines.push(`  return mocks[${JSON.stringify(from)}] `)
                   lines.push(`})`)

test/fixtures/nuxt-vitest/composables/use-default-export.ts

@@ -0,0 +1 @@
+export default () => 'the original'

test/fixtures/nuxt-vitest/tests/nuxt/mock-nuxt-composable-3.spec.ts

@@ -0,0 +1,18 @@
+import { expect, it } from 'vitest'
+import { mockNuxtImport } from 'vitest-environment-nuxt/utils'
+
+mockNuxtImport('useAutoImportedTarget', () => {
+  return () => 'mocked'
+})
+
+mockNuxtImport('useDefaultExport', () => {
+  return () => 'mocked'
+})
+
+it('should mock composables from project', () => {
+  expect(useAutoImportedTarget()).toMatchInlineSnapshot('"mocked"')
+})
+
+it('should mock composables from project even if it uses `export default`', () => {
+  expect(useDefaultExport()).toMatchInlineSnapshot('"mocked"')
+})