TypeScript tests fail with `ParseError: 'import' and 'export' may appear only with 'sourceType: module'`

Attempting to set up cypress-cucumber-preprocessor with add-typescript-to-cypress, I receive the following error when running a .feature test in Cypress whose step definitions are in a steps.ts file containing an import statement:

Error running plugin
The following error was thrown by a plugin. We've stopped running your tests because a plugin crashed.

...

ParseError: 'import' and 'export' may appear only with 'sourceType: module'

Running a separate spec.ts file containing an import using only @bahmutov/add-typescript-to-cypress in cypress/plugins/index.js works fine, but as soon as I add on('file:preprocessor', cucumber()); TypeScript tests containing import fail with the same error.

I see other open issues related to that same error but for ES6, not TypeScript (targeting ES5), so I am opening this case.

Versions:

• cypress@3.0.1
• cypress-cucumber-preprocessor@1.0.0
• @bahmutov/add-typescript-to-cypress@2.0.0
• node@8.11.2
• MacOS X 10.13.5

[KeithGillette]

Thanks, @sloosch & @lgandecki!

I confirm that the diffs above allow use of some TypeScript with cypress-cucumber-preprocessor. However, I notice that one can’t use TypeScript standard import or export statements. Any remedy for either of those shortcomings?

[lgandecki]

can you try using require instead of import?