importing popper-lite in a typescript project

[cvlmtg]

Hi, I'm using mocha and ts-node to run some tests for a typescript project. It all worked perfectly until I tried to switch from popper to popper-lite. In short, I have a file doing this:

import { createPopper, Instance, Options } from '@popperjs/core/lib/popper-lite';

When I bundle the lib everything works, but when I run the test I have this error:

yarn run v1.22.11
$ env NODE_ENV=test mocha --config mocha.json 'test/**/*.ts?(x)'

/Users/matteo/dev/react-smart-select/node_modules/@popperjs/core/lib/popper-lite.js:1
import { popperGenerator, detectOverflow } from "./createPopper.js";
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at wrapSafe (internal/modules/cjs/loader.js:979:16)
    at Module._compile (internal/modules/cjs/loader.js:1027:27)
etc...

If I understood correctly, this happens because popper's package.json doesn't have "type": "module" and because popper-lite.js doesn't have the .mjs extension...

I've tried every possible option combination inside tsconfig.json but nothing works. I even tried moduleTypes but it doesn't work either... what can I do? Thanks in advance for the help!

here's my tsconfig.json:

{
  "include": [ "src", "types" ],
  "compilerOptions": {
    "module": "esnext",
    "lib": [ "dom", "esnext" ],
    "importHelpers": true,
    "declaration": true,
    "sourceMap": true,
    "rootDir": "./src",
    "strict": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "moduleResolution": "node",
    "jsx": "react",
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "noEmit": true
  },
  "ts-node": {
    "transpileOnly": true,
    "compilerOptions": {
      "module": "commonjs"
    },
    "moduleTypes": {
      "node_modules/@popperjs/core/lib/popper-lite.js": "esm"
    }
  }
}

here's mocha config:

{
  "require": [
    "global-jsdom/register",
    "ts-node/register"
  ],
  "extension": [ "js", "jsx", "ts", "tsx" ],
  "checkLeaks": true,
  "recursive": true,
  "colors": true,
  "R": "spec"
  }