Summary
Running a TypeScript/Node.js AppHost with a daily SDK configured fails during TypeScript code generation when the installed Aspire CLI is 13.4.3 and the configured SDK is 13.5.0-preview.1.26310.1.
Repro
Given aspire.config.json:
{
"appHost": {
"path": "apphost.mts",
"language": "typescript/nodejs"
},
"sdk": {
"version": "13.5.0-preview.1.26310.1"
},
"channel": "daily"
}Run:
aspire run --debug --non-interactive
Expected behavior
The TypeScript AppHost starts, or the CLI provides a clear actionable version-alignment/update path for the configured daily SDK.
Actual behavior
The command fails with exit code 2.
The installed Aspire CLI version (13.4.3) differs from the configured Aspire SDK version (13.5.0-preview.1.26310.1). If you run into errors, run 'aspire update' to align them.
Some types in assembly 'Aspire.Hosting.CodeGeneration.TypeScript' could not be loaded; 25 of 27 types are available. LoaderExceptions: Could not load file or assembly 'Aspire.TypeSystem, Version=13.5.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
Assembly 'Aspire.Hosting.CodeGeneration.TypeScript' was loaded but did not contribute any ICodeGenerator implementations. This is likely caused by a binary mismatch between the bundled and probed assemblies (see preceding LoaderExceptions).
System.ArgumentException: No code generator found for language: TypeScript. No code generators were discovered in any loaded assembly. This usually indicates a binary mismatch between the bundled apphost server and the integration assemblies on disk; check the apphost server log for 'LoaderExceptions' Warnings.
Failed to run TypeScript (Node.js) AppHost: No code generator found for language: TypeScript. No code generators were discovered in any loaded assembly. This usually indicates a binary mismatch between the bundled apphost server and the integration assemblies on disk; check the apphost server log for 'LoaderExceptions' Warnings.
Environment
Aspire CLI: 13.4.3+4f218933552e18ff2874d1b6d5dc3fe671e3b6d9
Configured Aspire SDK: 13.5.0-preview.1.26310.1
AppHost language: typescript/nodejs
AppHost path: apphost.mts
Node.js: v22.20.0
npm: 10.9.3
OS: Darwin arm64
Notes
The debug log indicates the bundled apphost server is from the 13.4.3 CLI while the configured SDK/integration assemblies are from 13.5.0-preview.1.26310.1. The CLI update notifier reported no newer prerelease version available from the installed CLI.
Repro repository
https://github.com/mitchdenny/aspire-loves-terminals
Summary
Running a TypeScript/Node.js AppHost with a daily SDK configured fails during TypeScript code generation when the installed Aspire CLI is 13.4.3 and the configured SDK is 13.5.0-preview.1.26310.1.
Repro
Given
aspire.config.json:{ "appHost": { "path": "apphost.mts", "language": "typescript/nodejs" }, "sdk": { "version": "13.5.0-preview.1.26310.1" }, "channel": "daily" }Run:
Expected behavior
The TypeScript AppHost starts, or the CLI provides a clear actionable version-alignment/update path for the configured daily SDK.
Actual behavior
The command fails with exit code 2.
Environment
Notes
The debug log indicates the bundled apphost server is from the 13.4.3 CLI while the configured SDK/integration assemblies are from 13.5.0-preview.1.26310.1. The CLI update notifier reported no newer prerelease version available from the installed CLI.
Repro repository
https://github.com/mitchdenny/aspire-loves-terminals