No Mocha version is shown in the package.json when testing with cypress

Question

I am using cypress. But as I understand the cypress is built above mocha. So, I want to check what mocha version the project I am working with uses. I am heading to the package.json doing the search, but finding no mocha dependencies. Does it mean that mocha is built into cypress? How could I determine the used inside cypress mocha version then?

Answer 1

Updated

As Drew pointed out there are many versions of Mocha used in various packages under the Cypress repository.

I'm not sure that dependencies vs devDependencies is a solid indicator, since Cypress uses the Mocha library to make a modified version.

Here's a sampling from packages in the Cypress 12.16.0 repo:

• npm/webpack-dev-server: "mocha": "^9.2.2",
• npm/vite-dev-server: "mocha": "^9.2.2",
• graphql: "mocha": "^8.1.3",
• launcher: "mocha": "^8.1.3",
• tooling/electron-mksnapshot: "mocha": "^9.2.0",
• webpack-batteries-included-preprocessor: "mocha": "^8.1.1",
• webpack-preprocessor: "mocha": "^7.1.0",
• server: "mocha": "7.1.0", etc

so it kind of depends on the part of the Cypress suite you are using (Component tester, e2e runner, module api)

The link I would use for e2e testing is the driver package

  "devDependencies": {
    ...
    "mocha": "7.0.1",

---

Another approach that currently works is querying the global Cypress object.

it('log the Mocha version in use', function() { 
  console.log(Cypress.mocha._mocha.version)   // 7.0.1 for Cypress 12.16.0
})

where Cypress.mocha is the instance object and Cypress.mocha._mocha is the class definition (shown in devtools as Mocha type).

These properties may be removed at a future time.