SyntaxError: Cannot use import statement outside a module

I wanted to re-open a version of issue #73 as I'm currently running into it as well. The original issue is a couple years old now and it also looks like jest has been upgraded since to address this same issue in other context (e.g. this resolved issue). Unfortunately I still run into it when importing the tiny-secp256k1 library.

/packages/caravan-psbt/node_modules/tiny-secp256k1/lib/index.js:1
@caravan/psbt:test:watch:     ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){import { compare } from "uint8array-tools";
@caravan/psbt:test:watch:                                                                                       ^^^^^^
@caravan/psbt:test:watch: 
@caravan/psbt:test:watch:     SyntaxError: Cannot use import statement outside a module
@caravan/psbt:test:watch: 
@caravan/psbt:test:watch:       10 | import { toOutputScript } from "bitcoinjs-lib/src/address";
@caravan/psbt:test:watch:       11 | import * as bitcoin from "bitcoinjs-lib";
@caravan/psbt:test:watch:     > 12 | import * as ecc from "tiny-secp256k1";
@caravan/psbt:test:watch:          | ^
@caravan/psbt:test:watch:       13 |
@caravan/psbt:test:watch:       14 | bitcoin.initEccLib(ecc);
@caravan/psbt:test:watch:       15 |

You can see in this diff where I'm trying to add the library the code that throws the error. Without the import from tiny-secp25k1, I can run the test file no problem.

Here is the package.json relevant deps:

"bitcoinjs-lib": "^6.1.5",
"tiny-secp256k1": "^2.2.3"
"jest": "^29.4.1",
"ts-jest": "^29.1.2",

Interestingly if I try import another library from the bitcoinjs-lib "suite": import * as bip174 from 'bip174' that seems to work no problem.

As best I can tell an extra compiler like babel shouldn't be necessary with newer versions of jest and ts-jest as implied here. I could be wrong about that but just in case I also did try adding babel with a babel.config.js, but that didn't work either (and I'd rather avoid the extra config complexity as it is if possible).

Hopefully that provides enough details and perhaps you've seen this elsewhere since that last issue and might be able to point out something else I might've missed.

Ok, I was finally able to get jest to accept the import. But I am now running into issues with intEccLib. Will post that in another issue, but for this, here's how I got it working:

Should run jest with some extra args:

NODE_OPTIONS=--experimental-vm-modules npx jest --watch sr

and then the configs:

// jest.config.ts
import type { JestConfigWithTsJest } from "ts-jest";

const config: JestConfigWithTsJest = {
  extensionsToTreatAsEsm: [".ts"],
  verbose: true,
  preset: "ts-jest/presets/default-esm",
  testEnvironment: "node",
  transform: {
    "^.+\\.tsx?$": ["ts-jest", { useESM: true }],
  },
  testPathIgnorePatterns: ["./dist"],
  setupFiles: ["<rootDir>/jest.setup.ts"],
};

export default config;

needed a polyfill for certain environment issues (might not need this for every situation, but for completeness:

// jest.setup.ts
import "@inrupt/jest-jsdom-polyfills";

make sure the package.json you're testing for includes:

...
"type": "module",
...

bitcoinjs / tiny-secp256k1

SyntaxError: Cannot use import statement outside a module #135