Playground when mastra is embedded
When I run mastra embedded in an api route like the assistant-ui docs suppose https://www.assistant-ui.com/docs/runtimes/mastra/full-stack-integration I can not start the playground. It complains with
mastra dev
INFO [2025-10-16 12:57:58.803 +0200] (Mastra CLI): [Mastra Dev] - Starting server...
file:///.../.mastra/output/index.mjs:27
import { A2AError } from '@mastra/core/a2a';
^^^^^^^^
SyntaxError: The requested module '@mastra/core/a2a' does not provide an export named 'A2AError'
at ModuleJob._instantiate (node:internal/modules/esm/module_job:182:21)
at async ModuleJob.run (node:internal/modules/esm/module_job:266:5)
at async onImport.tracePromise.proto (node:internal/modules/esm/loader:644:26)
at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:116:5)
Node.js v22.15.1
Am I missing something or is that a bug?
mastra dev
INFO [2025-10-16 12:57:58.803 +0200] (Mastra CLI): [Mastra Dev] - Starting server...
file:///.../.mastra/output/index.mjs:27
import { A2AError } from '@mastra/core/a2a';
^^^^^^^^
SyntaxError: The requested module '@mastra/core/a2a' does not provide an export named 'A2AError'
at ModuleJob._instantiate (node:internal/modules/esm/module_job:182:21)
at async ModuleJob.run (node:internal/modules/esm/module_job:266:5)
at async onImport.tracePromise.proto (node:internal/modules/esm/loader:644:26)
at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:116:5)
Node.js v22.15.1
Am I missing something or is that a bug?
