Add a new option to CompilerOptions to set the value of the $jscomp.A…

…SSUME_ES6 PiperOrigin-RevId: 707308589
google · Dec 20, 2024 · f465cd7 · f465cd7
1 parent f51970c
commit f465cd7
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diff --git a/src/com/google/javascript/jscomp/CompilerOptions.java b/src/com/google/javascript/jscomp/CompilerOptions.java
@@ -183,6 +183,7 @@ void setDependentValuesFromYear(CompilerOptions options) {
       options.languageOutIsDefaultStrict = Optional.of(true);
       options.setDefineToNumberLiteral("goog.FEATURESET_YEAR", year);
       options.setDefineToBooleanLiteral("$jscomp.ASSUME_ES5", year > 2012);
+      options.setDefineToBooleanLiteral("$jscomp.ASSUME_ES6", year > 2018);
     }
 
     FeatureSet getFeatureSet() {

diff --git a/src/com/google/javascript/jscomp/ProcessDefines.java b/src/com/google/javascript/jscomp/ProcessDefines.java
@@ -59,6 +59,7 @@ class ProcessDefines implements CompilerPass {
           "COMPILED",
           "goog.DEBUG",
           "$jscomp.ASSUME_ES5",
+          "$jscomp.ASSUME_ES6",
           "$jscomp.ISOLATE_POLYFILLS",
           "$jscomp.INSTRUMENT_ASYNC_CONTEXT");
 

diff --git a/test/com/google/javascript/jscomp/CompilerOptionsTest.java b/test/com/google/javascript/jscomp/CompilerOptionsTest.java
@@ -75,6 +75,17 @@ public void testBrowserFeaturesetYearOptionSetsAssumeES5() {
         .isEqualTo(Token.TRUE);
   }
 
+  @Test
+  public void testBrowserFeaturesetYearOptionSetsAssumeES6() {
+    CompilerOptions options = new CompilerOptions();
+    options.setBrowserFeaturesetYear(2018);
+    assertThat(options.getDefineReplacements().get("$jscomp.ASSUME_ES6").getToken())
+        .isEqualTo(Token.FALSE);
+    options.setBrowserFeaturesetYear(2019);
+    assertThat(options.getDefineReplacements().get("$jscomp.ASSUME_ES6").getToken())
+        .isEqualTo(Token.TRUE);
+  }
+
   @Test
   public void testMinimumBrowserFeatureSetYearRequiredFor() {
     assertThat(BrowserFeaturesetYear.minimumRequiredFor(Feature.GETTER))