feat: allow to define custom function context types to extend the default World

[moretti]

Following the discussion on #864, I updated the type definition to make the step definition function context type extendable, e.g.:

import { Given } from "@badeball/cypress-cucumber-preprocessor";

interface CustomWorld extends Mocha.Context {
  homepage: HomePageDriver;
}

Given("I'm on the homepage", function (this: CustomWorld) {
  cy.visit("/");
  this.homepage = new HomePageDriver(cy);
});

[badeball]

Can you add a test case showing the new functionality? Such test should not pass before the implementation is introduced and pass thereafter. https://github.com/badeball/cypress-cucumber-preprocessor/blob/master/lib/index.test-d.ts

[moretti]

@badeball thank you for your feedback. I added more type tests here:

cypress-cucumber-preprocessor/lib/index.test-d.ts

Lines 112 to 131 in 56daf44

	interface CustomWorld extends Mocha.Context {
	pageDriver: {
	navigateTo(url: string): void;
	};
	}
	Given(/foo/, function (this: CustomWorld, url: string) {
	expectType<CustomWorld>(this);
	this.pageDriver.navigateTo(url);
	});
	When(/foo/, function (this: CustomWorld, url: string) {
	expectType<CustomWorld>(this);
	this.pageDriver.navigateTo(url);
	});
	Then(/foo/, function (this: CustomWorld, url: string) {
	expectType<CustomWorld>(this);
	this.pageDriver.navigateTo(url);
	});

[badeball]

Thanks for your contribution! I've merged this with 31aa9a0 and it's released as v13.1.0.