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typescriptmocha.jsnode-tsx

How to run mocha with the tsx TypeScript runner

I'm using the tsx command (similar to ts-node) to run all my TypeScript code.

How can I use tsx to run my Mocha test suite?

Solution

  • Add the following "node-option" key to your .mocharc.json, or to the "mocha" section in your package.json:

    {
  "node-option": ["import=tsx"]
}

    This causes Mocha to run as if you had run it with node --import=tsx, or NODE_OPTIONS="--import=tsx" mocha.

    Note that this requires at Node 18.18.0 or newer. On older Node versions (at least 14.18.0 seems to be required), use the --loader option instead:

    {
  "node-option": ["loader=tsx"]
}