fix: prevent delete failures on empty successful API responses

src/core/client.test.ts

@@ -0,0 +1,75 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { PixelmuseClient } from './client.js'
+import { ApiError } from './types.js'
+
+describe('PixelmuseClient', () => {
+  afterEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  it('deleteGeneration succeeds for 204 No Content responses', async () => {
+    const fetchSpy = vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+      new Response(null, { status: 204 }),
+    )
+
+    const client = new PixelmuseClient('pm_live_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
+
+    await expect(client.deleteGeneration('gen_123')).resolves.toBeUndefined()
+    expect(fetchSpy).toHaveBeenCalledTimes(1)
+  })
+
+  it('getGeneration still parses successful JSON responses', async () => {
+    const generationPayload = {
+      id: 'gen_123',
+      status: 'succeeded',
+      model: 'nano-banana-2',
+      prompt: 'test prompt',
+      output: ['data:image/png;base64,AAAA'],
+      credits_charged: 1,
+      error: null,
+      created_at: '2026-03-28T00:00:00.000Z',
+      completed_at: '2026-03-28T00:00:01.000Z',
+      visibility: 'private',
+    }
+    vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+      new Response(JSON.stringify(generationPayload), {
+        status: 200,
+        headers: { 'Content-Type': 'application/json' },
+      }),
+    )
+
+    const client = new PixelmuseClient('pm_live_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
+    const result = await client.getGeneration('gen_123')
+
+    expect(result.id).toBe('gen_123')
+    expect(result.status).toBe('succeeded')
+  })
+
+  it('surfaces structured API errors from JSON payloads', async () => {
+    vi.spyOn(globalThis, 'fetch').mockResolvedValue(
+      new Response(
+        JSON.stringify({
+          error: { message: 'Quota exceeded', code: 'QUOTA_EXCEEDED' },
+        }),
+        {
+          status: 429,
+          headers: {
+            'Content-Type': 'application/json',
+            'X-RateLimit-Remaining': '0',
+            'Retry-After': '12',
+          },
+        },
+      ),
+    )
+
+    const client = new PixelmuseClient('pm_live_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
+
+    await expect(client.getAccount()).rejects.toMatchObject<ApiError>({
+      message: 'Quota exceeded',
+      status: 429,
+      code: 'QUOTA_EXCEEDED',
+      rateLimitRemaining: 0,
+      retryAfter: 12,
+    })
+  })
+})

src/core/client.ts

@@ -79,6 +79,9 @@ export class PixelmuseClient {
       )
     }
 
+    if (res.status === 204 || res.status === 205) {
+      return undefined as T
+    }
     return (await res.json()) as T
   }