✨ Add support for Nightwatch 2.x (#390)

* ✨ Add support for Nightwatch 2.x

This also retains compatibility with Nightwatch 1.x

* ✅ Force headless in CI

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 geckodriver.log
 .nyc_output
+logs/

commands/percySnapshot.js

@@ -19,15 +19,18 @@ module.exports = class PercySnapshotCommand {
 
       // Serialize and capture the DOM
       /* istanbul ignore next: no instrumenting injected code */
-      let { value: { domSnapshot, url } } = (
-        await this.api.execute(function(options) {
+      let { domSnapshot, url } = await new Promise((resolve) => {
+        this.api.execute(function(options) {
           return {
             /* eslint-disable-next-line no-undef */
             domSnapshot: PercyDOM.serialize(options),
             url: document.URL
           };
-        }, [options])
-      );
+        }, [options], function(result) {
+          // Check if we're in Nightwatch 1.x (which returns with `.value`)
+          result.value ? resolve(result.value) : resolve(result);
+        });
+      });
 
       // Post the DOM to the snapshot endpoint with snapshot options and other info
       await utils.postSnapshot({

package.json

@@ -21,15 +21,15 @@
   },
   "scripts": {
     "lint": "eslint --ignore-path .gitignore .",
-    "test": "nightwatch",
+    "test": "MOZ_HEADLESS=1 nightwatch",
     "test:coverage": "nyc yarn test",
     "test:types": "tsd"
   },
   "dependencies": {
     "@percy/sdk-utils": "^1.0.0"
   },
   "peerDependencies": {
-    "nightwatch": "~1"
+    "nightwatch": ">=1"
   },
   "devDependencies": {
     "@percy/core": "^1.0.0",
@@ -43,7 +43,7 @@
     "expect": "^27.0.2",
     "geckodriver": "^3.0.1",
     "mocha": "^10.0.0",
-    "nightwatch": "^1.5.1",
+    "nightwatch": "^2.1.3",
     "nyc": "^15.1.0",
     "tsd": "^0.20.0"
   }