A
arktype•2mo ago
Michael Schaufelberger

[attest] Getting `requested module ... does not provide an export` error for my bench script

Hi 👋 I'm having TS performance issues in my project. I think the offender is mainly tRPC with Zod and Drizzle, but I wanted to analyze a bit more before changing too much of my code. So I set up a very basic bench.ts script to check how long the tRPC appRouter would take to instantiate. 
import { dateCoerce } from 'utils/zod/common';
import { appRouter } from '@/app/api/trpc/server/router';
import { bench } from '@ark/attest';

bench('single-quoted', () => {
  const router = appRouter;
}).types([0, 'instantiations']);
import { dateCoerce } from 'utils/zod/common';
import { appRouter } from '@/app/api/trpc/server/router';
import { bench } from '@ark/attest';

bench('single-quoted', () => {
  const router = appRouter;
}).types([0, 'instantiations']);
However, I'm receiving the following error: 
/app/src/_modules/db/types.ts:1
import { dateCoerce } from 'utils/zod/common';
         ^

SyntaxError: The requested module 'utils/zod/common' does not provide an export named 'dateCoerce'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:177:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:260:5)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:543:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:116:5)
/app/src/_modules/db/types.ts:1
import { dateCoerce } from 'utils/zod/common';
         ^

SyntaxError: The requested module 'utils/zod/common' does not provide an export named 'dateCoerce'
    at ModuleJob._instantiate (node:internal/modules/esm/module_job:177:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:260:5)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:543:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:116:5)
where utils/zod/common is monorepo typescript package, that holds some utility functions. It's declared inside my package.json 
    "utils": "workspace:*",
    "utils": "workspace:*",
I'm using pnpm (without hoisting). But there are on type errors for VS Code if I open the bench.ts file. How can I resolve this error?
2 Replies
ssalbdivad
ssalbdivad•2mo ago
That looks like a runtime error on the import. Are you running bench.ts the same way you'd run any other TS script? There's no special bench runner, so I don't think this is related to attest (e.g. try just deleting all the attest logic and just console logging that import)
Michael Schaufelberger
Michael SchaufelbergerOP•2mo ago
Thank you. Yeah that's the case. Sorry for wasting your time. Coincidentally, I've never ran any script in this project that had references to an internal monorepo package before. 🤦‍♂️ For anyone finding this: Do not forget "type": "module" in your workspace package's package.json and you need to use verbatimModuleSyntax (in your whole project) for tsx to be able to run everything 😅

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