@swc/jest

To make your Jest tests run faster, you can swap out the default JavaScript-based test runner for a drop-in Rust replacement using SWC.

Installation

npm i -D jest @swc/jest

Inside jest.config.js, configure Jest to use SWC:

module.exports = {
  transform: {
    "^.+\\.(t|j)sx?$": ["@swc/jest"],
  },
};

If you're using SWC as part of Next.js, you do not need to manually install this. Instead, you should use next/jest.