Add package.json to node module exports (#1870)

* Add package.json to node module exports

* Update changelog

* Add a scenario to validate we can export package.json and version numbers

* Use template literal rather than string concatenation in direct_imports.feature

* Change entry in the changelog

Author: aurelien-reeves

CHANGELOG.md

@@ -9,6 +9,9 @@ Please see [CONTRIBUTING.md](https://github.com/cucumber/cucumber/blob/master/CO
 
 ## [Unreleased]
 ### Fixed
+- Ensure package.json can be imported by consuming projects
+  ([PR#1870](https://github.com/cucumber/cucumber-js/pull/1870)
+   [Issue#1869](https://github.com/cucumber/cucumber-js/issues/1869))
 - Allows for parentheses in paths for developers working on cucumber's own code ([[#1735](https://github.com/cucumber/cucumber-js/issues/1735)])
 - Smoother onboarding for Windows developers ([#1863](https://github.com/cucumber/cucumber-js/pull/1863))
 

features/direct_imports.feature

@@ -60,4 +60,26 @@ Feature: Core feature elements execution using direct imports
       Given(/^a step passes$/, function() {});
       """
     When I run cucumber-js
-    Then it passes
+    Then it passes
+
+  Scenario: we can import the version number from package.json and from the library
+    Given a file named "features/a.feature" with:
+      """
+      Feature: some feature
+        Scenario: some scenario
+          Given a step checks the version number
+      """
+    And a file named "features/step_definitions/cucumber_steps.js" with:
+      """
+      const {Given} = require('@cucumber/cucumber')
+      const package_version = require('@cucumber/cucumber/package.json').version
+      const library_version = require('@cucumber/cucumber').version
+
+      Given(/^a step checks the version number$/, function() {
+        if (package_version !== library_version) {
+          throw new Error(`package version: ${package_version} !== library version: ${library_version}`)
+        }
+      });
+      """
+    When I run cucumber-js
+    Then it passes

package.json

@@ -175,7 +175,8 @@
     },
     "./lib/*": {
       "require": "./lib/*.js"
-    }
+    },
+    "./package.json": "./package.json"
   },
   "types": "./lib/index.d.ts",
   "engines": {