Add Chrome Headless browser. (#4)

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change Log
 
 ## [Unreleased]
+- Add Chrome Headless browser.
 
 ## [0.2.1] - 2017-10-18
 - Remove Firefox from set of browsers with push capability due to https://bugzilla.mozilla.org/show_bug.cgi?id=1409570.

package.json

@@ -29,6 +29,6 @@
   },
   "dependencies": {
     "@types/ua-parser-js": "^0.7.31",
-    "ua-parser-js": "^0.7.14"
+    "ua-parser-js": "^0.7.15"
   }
 }

src/browser-capabilities.ts

@@ -31,21 +31,19 @@ export type BrowserCapability =
 // class can't be referenced as a type. Fix the typings.
 export type UserAgentPredicate = (ua: any) => boolean;
 
+const chrome = {
+  es2015: since(49),
+  push: since(41),
+  serviceworker: since(45),
+  modules: since(61),
+};
+
 const browserPredicates: {
   [browser: string]: {[key in BrowserCapability]: UserAgentPredicate}
 } = {
-  'Chrome': {
-    es2015: since(49),
-    push: since(41),
-    serviceworker: since(45),
-    modules: since(61),
-  },
-  'Chromium': {
-    es2015: since(49),
-    push: since(41),
-    serviceworker: since(45),
-    modules: since(61),
-  },
+  'Chrome': chrome,
+  'Chromium': chrome,
+  'Chrome Headless': chrome,
   'OPR': {
     es2015: since(36),
     push: since(28),

src/test/browser-capabilities_test.ts

@@ -31,6 +31,12 @@ suite('capabilities', function() {
         ['es2015', 'push', 'serviceworker', 'modules']);
   });
 
+  test('chrome headless has all the capabilities', () => {
+    assertBrowserCapabilities(
+        'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/61.0.3163.31 Safari/537.36',
+        ['es2015', 'push', 'serviceworker', 'modules']);
+  });
+
   test('edge es2015 support is predicated on minor browser version', () => {
     assertBrowserCapabilities(
         'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Edge/15.14986',