Add BROWSER_FEATURESET_YEAR 2024

PiperOrigin-RevId: 602423649

Author: Closure Team

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

@@ -146,14 +146,16 @@ private class BrowserFeaturesetYear implements Serializable {
 
     BrowserFeaturesetYear(int year) {
       checkState(
-          year == 2012 || (year >= 2018 && year <= 2023),
-          "Illegal browser_featureset_year=%s. We support values 2012, or 2018..2023 only",
+          year == 2012 || (year >= 2018 && year <= 2024),
+          "Illegal browser_featureset_year=%s. We support values 2012, or 2018..2024 only",
           year);
       this.year = year;
     }
 
     void setDependentValuesFromYear() {
-      if (year == 2023) {
+      if (year == 2024) {
+        setOutputFeatureSet(FeatureSet.BROWSER_2024);
+      } else if (year == 2023) {
         setOutputFeatureSet(FeatureSet.BROWSER_2023);
       } else if (year == 2022) {
         setOutputFeatureSet(FeatureSet.BROWSER_2022);

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

@@ -85,6 +85,9 @@ public final class FeatureSet implements Serializable {
 
   public static final FeatureSet ES2021 = ES2021_MODULES.without(Feature.MODULES);
 
+  // NOTE: when ES2022 / ES2023 are added, the BROWSER_2024 FeatureSet defined below should be
+  // updated to include them.
+
   // Set of all fully supported features, even those part of language versions not fully supported
   public static final FeatureSet ES_NEXT = ES2021_MODULES.with(LangVersion.ES_NEXT.features());
 
@@ -128,6 +131,10 @@ public final class FeatureSet implements Serializable {
           // we need to change the way that is done to avoid incorrect inclusion of polyfills.
           Feature.REGEXP_LOOKBEHIND);
 
+  // According to https://compat-table.github.io/compat-table/es2016plus/ this should include all
+  // features through ES2023.
+  public static final FeatureSet BROWSER_2024 = ES2021_MODULES;
+
   public static final FeatureSet ALL = ES_UNSUPPORTED.with(LangVersion.TYPESCRIPT.features());
 
   private enum LangVersion {

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

@@ -57,6 +57,9 @@ public void testBrowserFeaturesetYearOptionSetsLanguageOut() {
 
     options.setBrowserFeaturesetYear(2023);
     assertThat(options.getOutputFeatureSet()).isEqualTo(FeatureSet.BROWSER_2023);
+
+    options.setBrowserFeaturesetYear(2024);
+    assertThat(options.getOutputFeatureSet()).isEqualTo(FeatureSet.BROWSER_2024);
   }
 
   @Test