Add BROWSER_FEATURESET_YEAR 2025

PiperOrigin-RevId: 713466756

Author: Closure Team

src/com/google/javascript/jscomp/CompilerOptions.java

@@ -146,7 +146,8 @@ enum BrowserFeaturesetYear {
     YEAR_2021(2021, FeatureSet.BROWSER_2021),
     YEAR_2022(2022, FeatureSet.BROWSER_2022),
     YEAR_2023(2023, FeatureSet.BROWSER_2023),
-    YEAR_2024(2024, FeatureSet.BROWSER_2024);
+    YEAR_2024(2024, FeatureSet.BROWSER_2024),
+    YEAR_2025(2025, FeatureSet.BROWSER_2025);
 
     private final int year;
     private final FeatureSet featureSet;
@@ -160,7 +161,8 @@ enum BrowserFeaturesetYear {
             2021, YEAR_2021,
             2022, YEAR_2022,
             2023, YEAR_2023,
-            2024, YEAR_2024
+            2024, YEAR_2024,
+            2025, YEAR_2025
             // go/keep-sorted end
             );
 
@@ -172,7 +174,7 @@ private BrowserFeaturesetYear(int year, FeatureSet featureSet) {
     static BrowserFeaturesetYear from(int year) {
       checkState(
           YEAR_MAP.containsKey(year),
-          "Illegal browser_featureset_year=%s. We support values 2012, or 2018..2024 only",
+          "Illegal browser_featureset_year=%s. We support values 2012, or 2018..2025 only",
           year);
       return YEAR_MAP.get(year);
     }

src/com/google/javascript/jscomp/parsing/parser/FeatureSet.java

@@ -132,9 +132,15 @@ public final class FeatureSet implements Serializable {
           Feature.REGEXP_LOOKBEHIND);
 
   // According to https://compat-table.github.io/compat-table/es2016plus/ this should include all
-  // features through ES2023.
+  // features through ES2023. So once LangVersion.ES2023 is added, this should be updated to
+  // include it.
   public static final FeatureSet BROWSER_2024 = ES2021_MODULES;
 
+  // According to https://compat-table.github.io/compat-table/es2016plus/ this should include all
+  // features through ES2024, except for the latest unicode versions for the /v regexp flag, which
+  // isn't disqualifying. So once LangVersion.ES2024 is added, this should be updated to include it.
+  public static final FeatureSet BROWSER_2025 = ES2021_MODULES;
+
   public static final FeatureSet ALL = ES_UNSUPPORTED.with(LangVersion.TYPESCRIPT.features());
 
   private enum LangVersion {

test/com/google/javascript/jscomp/CompilerOptionsTest.java

@@ -62,6 +62,9 @@ public void testBrowserFeaturesetYearOptionSetsLanguageOut() {
 
     options.setBrowserFeaturesetYear(2024);
     assertThat(options.getOutputFeatureSet()).isEqualTo(FeatureSet.BROWSER_2024);
+
+    options.setBrowserFeaturesetYear(2025);
+    assertThat(options.getOutputFeatureSet()).isEqualTo(FeatureSet.BROWSER_2025);
   }
 
   @Test