Error when evaluating SSR module fresh:server_entry: Cannot read properties of undefined (reading 'transformReply')

[juls08]

Fresh version: 2.1.1
OS: Ubuntu 24.04.3 LTS

Trying to use the NPM library Redis (https://www.npmjs.com/package/redis)

10:31:30 AM [vite] (ssr) Error when evaluating SSR module fresh:server_entry: Cannot read properties of undefined (reading 'transformReply')
at getTransformReply (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/commander.js:10:1902)
at #createModuleCommand (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/client/index.js:24:2367)
at attachConfig (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/commander.js:10:1103)
at RedisClient.factory (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/client/index.js:24:3542)
at create (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/client/index.js:25:79)
at createClient (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/redis@5.8.2/node_modules/redis/dist/index.js:29:1340)
at eval (/home/juls/projects/deno-projects/fresh-project-v2.1.1/main.ts:6:58)
at async ESModulesEvaluator.runInlinedModule (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:905:3)
at async SSRCompatModuleRunner.directRequest (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1112:59)
at async SSRCompatModuleRunner.directRequest (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/chunks/dep-D5b0Zz6C.js:18627:22)
at async SSRCompatModuleRunner.cachedRequest (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1030:73)
at async eval (fresh:server_entry:8:31)
at async ESModulesEvaluator.runInlinedModule (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:905:3)
at async SSRCompatModuleRunner.directRequest (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1112:59)
at async SSRCompatModuleRunner.directRequest (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/chunks/dep-D5b0Zz6C.js:18627:22)
at async SSRCompatModuleRunner.cachedRequest (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1030:73)
at async SSRCompatModuleRunner.import (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:991:10)
at async instantiateModule (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/chunks/dep-D5b0Zz6C.js:18600:10)
at async https://jsr.io/@fresh/plugin-vite/1.0.4/src/plugins/dev_server.ts:72:23
error: Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'transformReply')
at getTransformReply (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/commander.js, :10:1902)
at #createModuleCommand (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/client/index.js, :24:2367)
at attachConfig (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/commander.js, :10:1103)
at RedisClient.factory (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/client/index.js, :24:3542)
at create (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/@redis+client@5.8.2/node_modules/@redis/client/dist/lib/client/index.js, :25:79)
at createClient (/home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/redis@5.8.2/node_modules/redis/dist/index.js, :29:1340)
at eval (/home/juls/projects/deno-projects/fresh-project-v2.1.1/main.ts, :6:58)
at async ESModulesEvaluator.runInlinedModule (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:905:3)
at async SSRCompatModuleRunner.directRequest (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1112:59)
at async SSRCompatModuleRunner.directRequest (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/chunks/dep-D5b0Zz6C.js:18627:22)
at async SSRCompatModuleRunner.cachedRequest (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1030:73)
at async eval (fresh:server_entry, :8:31)
at async ESModulesEvaluator.runInlinedModule (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:905:3)
at async SSRCompatModuleRunner.directRequest (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1112:59)
at async SSRCompatModuleRunner.directRequest (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/chunks/dep-D5b0Zz6C.js:18627:22)
at async SSRCompatModuleRunner.cachedRequest (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:1030:73)
at async SSRCompatModuleRunner.import (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/module-runner.js:991:10)
at async instantiateModule (file:///home/juls/projects/deno-projects/fresh-project-v2.1.1/node_modules/.deno/vite@7.1.6_1/node_modules/vite/dist/node/chunks/dep-D5b0Zz6C.js:18600:10)
at async https://jsr.io/@fresh/plugin-vite/1.0.4/src/plugins/dev_server.ts:72:23

[igorbrasileiro]

I'm getting some errors like this one ☝️ . In my case, my sites with fresh 1, has some packages that only runs on server (node opentelemetry and @deco/durable https://jsr.io/@deco/durable) that seems to be the root cause. Stack trace eerror on gist https://gist.github.com/igorbrasileiro/1bee57fe967b66ab433730f0846bf731

If want I can share a repo with this error.

[NeaByteLab]

Try this: https://deno.land/x/redis

npm redis package may have conflict with deno ecosystem.

[lunadogbot]

Same family as #3673 (ioredis) — @redis/client ships CJS-only entry points and Vite's pre-bundling rewrites the internal CJS require/module.exports shape, leaving things like commander.transformReply undefined when the module is later loaded through the SSR module runner.

The likely fix path is #3765 ("externalize CJS-only npm packages in SSR build"), which would skip pre-bundling for packages like redis / ioredis and let Deno's npm resolver load them directly. Once that lands, this should resolve without changes on your end.

In the meantime, two workarounds:

1. Use a Deno-native Redis client like jsr:@db/redis or https://deno.land/x/redis (as @NeaByteLab suggested).
2. Force-externalize on your side via Vite config:

   export default defineConfig({
     plugins: [fresh()],
     ssr: { external: ["redis", "@redis/client"] },
   });

   That bypasses Vite's bundling for those modules and lets Deno's resolver handle them as native CJS.

Leaving open and labeled bug + upstream (the upstream half is the redis package's CJS-only shape interacting with Vite's optimizer).