[Bug]: Using dynamic import of ESM library yields "Cannot find module"

[joaorodrigues-consensys]

Version

28.0.7

Steps to reproduce

1. Clone my repo at: https://github.com/joaorodrigues-consensys/test-lodestart-libs
2. nvm use
3. npm install
4. npm run test

Expected behavior

Expected test to pass

Actual behavior

Tests failed: error TS2307: Cannot find module '@lodestar/params' or its corresponding type declarations.

This is a full ESM library that has to use dynamic import (await import()). Application works fine (e.g.: npm run build or npm run start).

Debug log

ts-jest.log

Additional context

We've got a statement in the code of a dynamic import of an ESM package:

const p = await import('@lodestar/params')

This code runs well at runtime (i.e.: application running) and the module is correctly imported. However, it fails when running tests:

    src/app.controller.ts:9:28 - error TS2307: Cannot find module '@lodestar/params' or its corresponding type declarations.

    9     const p = await import('@lodestar/params')

---

Notes on the repo: it's a plain nestjs project with a controller that dynamically imports the library:

• git repo: https://github.com/joaorodrigues-consensys/test-lodestart-libs
• offending line: https://github.com/joaorodrigues-consensys/test-lodestart-libs/blob/main/src/app.controller.ts#L9
• npm run start && curl http://localhost:6556 runs through controller code, loads the library and returns a valid value
• npm run test fails with Cannot find module '@lodestar/params' or its corresponding type declarations.

Environment

System:
    OS: Linux 5.18 Pop!_OS 22.04 LTS
    CPU: (16) x64 12th Gen Intel(R) Core(TM) i7-1260P
  Binaries:
    Node: 18.7.0 - ~/.nvm/versions/node/v18.7.0/bin/node
    npm: 8.15.0 - ~/.nvm/versions/node/v18.7.0/bin/npm
  npmPackages:
    jest: 28.1.3 => 28.1.3

[ahnpnl]

You can set diagnostics: false in ts-jest option or use isolatedModules: true to work around the problem. It's something with the type checking which doesn't perform probably comparing to tsc

[joaorodrigues-consensys]

fantastic, both options worked great :+1: