Viem can not be compiled with node16/bundle module resolution by tsc

[mojtabast]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Viem Version

2.19.6

Current Behavior

Goes through this error:

node_modules/viem/_types/account-abstraction/accounts/types.d.ts:2:63 - error TS1479: The current file is a CommonJS module whose imports will produce 'require' calls; however, the referenced file is an ECMAScript module and cannot be imported with 'require'. Consider writing a dynamic 'import("webauthn-p256")' call instead.

2 import type { SignReturnType as WebAuthnSignReturnType } from 'webauthn-p256';
                                                                ~~~~~~~~~~~~~~~

node_modules/webauthn-p256/_types/types.d.ts:27:67 - error TS2536: Type '_K' cannot be used to index type 'fallback'.

27     [_K in Exclude<keys, keyof Item>]?: fallback extends object ? fallback[_K] : undefined;
                                                                     ~~~~~~~~~~~~


Found 2 errors in 2 files.

Errors  Files
     1  node_modules/viem/_types/account-abstraction/accounts/types.d.ts:2
     1  node_modules/webauthn-p256/_types/types.d.ts:27

Expected Behavior

It should be compiled when module: node16 or module: esnext and moduleResolution: bundler enabled.

Steps To Reproduce

Try to run on my repo:

yarn
yarn run compile

Link to Minimal Reproducible Example

https://github.com/mojtabast/viem-tsc-compile-node16-issue

Anything else?

The problem is on node16 you can not import directly from a cjs module during ESM spec. it seems webauthn-p256 is cjs and somewhere you are importing a type from a cjs module:

import type { SignReturnType as WebAuthnSignReturnType } from 'webauthn-p256';

Although, typescript should differentiate a normal import and a type import, but it doesn't do that. You can follow some discussion around this here:

• Should type-only import resolving to ES module from CJS module be allowed? microsoft/TypeScript#52529
• TS1479 Unable to import types from ESM package when moduleResolution is nodenext microsoft/TypeScript#54523

[itslesther]

Any update/workaround on this issue?

[jxom]

"skipLibCheck": true

[mojtabast]

"skipLibCheck": true

@jxom
This is not a good recommendation since it reduces type accuracy. Another problem is for library authors, any library depends on viem which is publishing their package should tell "skipLibCheck": true to their users.

[jxom]

It's a workaround.