TypeScript typings example for cucumber

cucumber.ts

import { World } from "support/World";

export namespace cucumber {
  type Step = RegExp|string;
  interface StepCallback extends Function {
    (this: World, ...args: any[]): void|Promise<any>;
  }
  export interface Feature {
    Given(step: Step, callback: StepCallback): void;
    When(step: Step, callback: StepCallback): void;
    Then(step: Step, callback: StepCallback): void;
    After(callback: Function): void;
    Before(callback: Function): void;
  }
  export interface FeatureContext {
    (this: Feature): void;
  }
  export interface Callback {
    (err?: any, type?: string): void;
  }
  export interface Table {
    hashes<T>(): T[];
    rows(): string[][];
    raw(): string[][];
    rowsHash(): { [key: string]: string };
    rowsHash<T>(): T;
  }
}

steps.example.ts

import { cucumber } from "somewhere"; // or you could add it to global namespace

const steps: cucumber.FeatureContext = function() {
  // here this has type Feature from cucumber namespace
  this.Given("test", function() {
    // here this has type World
  });
};

export default steps;