Jest + Stencil + ESM

I need help configuring Jest in my stencil application. Currently i’m building a Design System in which i use:

  1. Typescript;
  2. Sholeace (a web component library);
  3. Jest for unit testing.

Project structure (monorepo with npm workspaces only):

  • design-system/
  • node_modules (which contains the shoelace library)
    • packages/
      • stencil-app/
        • stencil.config.ts
        • tsconfig.json

I implemented a wrapper component that imports the shoelace tooltip component, which is built as an ESM Module, so I imported via the @import statement.
My current problem is that my spec tests are failing because it says:
SyntaxError: Cannot use import statement outside a module

  1 | import { Component, Prop, h } from '@stencil/core';
> 2 | import '@shoelace-style/shoelace/dist/components/tooltip/tooltip.js';

I’ve tried everything, using babel with jest, using ts-jest, using other presets of ts-jest… Creating separate configurations for babel and jest, although stencil provides the “testing” object for in stencil.config.ts
Nothing seems to work !