Utilizing custom parameter types for Cypress Cucumber preprocessor with TypeScript

I have been using cypress-cucumber-preprocessor with cypress and typescript. While exploring the custom parameter types feature, I came across a possibility to define custom parameter types in my step definitions file.

However, I am facing challenges when trying to run it with Typescript. The interface in TypeScript is defined as

export function defineParameterType(): void;
, which makes it difficult for me to write a proper definition when importing the module.

When I tried implementing it in JavaScript, following the example provided, I encountered an error:

Uncaught Error: Undefined parameter type {boolean}

My JavaScript code snippet looks like this:

defineParameterType({
  name: "boolean",
  regexp: /true|false/,
  transformer(s) {
    return s === 'true';
  }
});

Is there a workaround to make it work seamlessly with Typescript?

Answer №1

The information regarding custom types is a bit sparse (I want to emphasize that this is not a criticism of the developers, as documentation can be challenging).

To successfully implement custom types, I defined them in

support/custom-parameter-types.ts
, and then imported that file into my step files using
import '<path-to-your-support-folder>/custom-parameter-types';

While I'm not completely certain if this is the optimal approach, it does seem to get the job done.

Note: Although this method works, keep in mind that depending on your editor/IDE, you may encounter undefined steps in your feature files.

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