feat: introduce navigator.language (#12322)

Link to the spec:
https://html.spec.whatwg.org/multipage/system-state.html#dom-navigator-language-dev

Co-authored-by: Bartek Iwańczuk <biwanczuk@gmail.com>

1 files changed, 35 insertions, 1 deletions

diff --git a/runtime/js/99_main.js b/runtime/js/99_main.js
index 0a65cadee..a123fc24f 100644
--- a/runtime/js/99_main.js
+++ b/runtime/js/99_main.js
@@ -335,7 +335,7 @@ delete Intl.v8BreakIterator;
 
   const navigator = webidl.createBranded(Navigator);
 
-  let numCpus, userAgent;
+  let numCpus, userAgent, language;
 
   ObjectDefineProperties(Navigator.prototype, {
     gpu: {
@@ -362,6 +362,22 @@ delete Intl.v8BreakIterator;
         return userAgent;
       },
     },
+    language: {
+      configurable: true,
+      enumerable: true,
+      get() {
+        webidl.assertBranded(this, NavigatorPrototype);
+        return language;
+      },
+    },
+    languages: {
+      configurable: true,
+      enumerable: true,
+      get() {
+        webidl.assertBranded(this, NavigatorPrototype);
+        return [language];
+      },
+    },
   });
   const NavigatorPrototype = Navigator.prototype;
 
@@ -393,6 +409,22 @@ delete Intl.v8BreakIterator;
         webidl.assertBranded(this, WorkerNavigatorPrototype);
         return numCpus;
       },
+      language: {
+        configurable: true,
+        enumerable: true,
+        get() {
+          webidl.assertBranded(this, WorkerNavigatorPrototype);
+          return language;
+        },
+      },
+      languages: {
+        configurable: true,
+        enumerable: true,
+        get() {
+          webidl.assertBranded(this, WorkerNavigatorPrototype);
+          return [language];
+        },
+      },
     },
   });
   const WorkerNavigatorPrototype = WorkerNavigator.prototype;
@@ -705,6 +737,7 @@ delete Intl.v8BreakIterator;
 
     numCpus = runtimeOptions.cpuCount;
     userAgent = runtimeOptions.userAgent;
+    language = runtimeOptions.locale;
 
     const internalSymbol = Symbol("Deno.internal");
 
@@ -793,6 +826,7 @@ delete Intl.v8BreakIterator;
 
     location.setLocationHref(runtimeOptions.location);
     numCpus = runtimeOptions.cpuCount;
+    language = runtimeOptions.locale;
 
     globalThis.pollForMessages = pollForMessages;