fix: updates browserlist to support newer js versions (#360)

Author: yowainwright

lib/constants/versions.js

@@ -77,6 +77,11 @@ const BROWSER_TO_ES_VERSION = {
     18: 9,
     79: 10,
     80: 11,
+    85: 12,
+    93: 13,
+    97: 14,
+    117: 15,
+    136: 16,
   },
   firefox: {
     52: 6,
@@ -85,6 +90,11 @@ const BROWSER_TO_ES_VERSION = {
     65: 9,
     70: 10,
     75: 11,
+    79: 12,
+    90: 13,
+    104: 14,
+    119: 15,
+    134: 16,
   },
   chrome: {
     51: 6,
@@ -93,6 +103,11 @@ const BROWSER_TO_ES_VERSION = {
     70: 9,
     75: 10,
     80: 11,
+    85: 12,
+    93: 13,
+    97: 14,
+    117: 15,
+    136: 16,
   },
   safari: {
     10: 6,
@@ -101,6 +116,11 @@ const BROWSER_TO_ES_VERSION = {
     12: 9,
     13: 10,
     13.1: 11,
+    14: 12,
+    14.1: 13,
+    15.4: 14,
+    17: 15,
+    18.2: 16,
   },
   opera: {
     38: 6,
@@ -109,6 +129,11 @@ const BROWSER_TO_ES_VERSION = {
     57: 9,
     62: 10,
     67: 11,
+    71: 12,
+    79: 13,
+    83: 14,
+    103: 15,
+    121: 16,
   },
   ios_saf: {
     10: 6,
@@ -117,14 +142,24 @@ const BROWSER_TO_ES_VERSION = {
     12: 9,
     13: 10,
     13.4: 11,
+    14: 12,
+    14.5: 13,
+    15.4: 14,
+    17: 15,
+    18.2: 16,
   },
   android: {
     67: 6,
     76: 7,
     80: 8,
-    85: 9,
-    90: 10,
-    95: 11,
+    81: 9,
+    85: 10,
+    90: 11,
+    92: 12,
+    93: 13,
+    97: 14,
+    117: 15,
+    136: 16,
   },
 };
 

tests/unit/browserslist.test.js

@@ -97,11 +97,11 @@ describe("getESVersionFromBrowserslist", () => {
     );
   });
 
-  it("should determine correct ES version for Safari", () => {
+  it("should determine ES12+ for Safari 14+", () => {
     const esVersion = getESVersionFromBrowserslist({
       browserslistQuery: "Safari >= 14",
     });
-    assert.strictEqual(esVersion, 11, "ES version should be 11 for Safari 14+");
+    assert(esVersion >= 12, "ES version should be 12 or higher for Safari 14+");
   });
 
   it("should determine correct ES version for modern Chrome versions", () => {
@@ -114,11 +114,11 @@ describe("getESVersionFromBrowserslist", () => {
     );
   });
 
-  it("should determine correct ES version for specific Chrome version (issue #324)", () => {
+  it("should determine ES14 for Chrome 111", () => {
     const esVersion = getESVersionFromBrowserslist({
       browserslistQuery: "chrome 111",
     });
-    assert.strictEqual(esVersion, 11, "ES version should be 11 for Chrome 111");
+    assert.strictEqual(esVersion, 14, "ES version should be 14 for Chrome 111");
   });
 
   it("should return ES5 if browserslist throws an error", () => {
@@ -157,16 +157,16 @@ describe("getESVersionForBrowser", () => {
     assert.strictEqual(getESVersionForBrowser("firefox", "40"), 6);
   });
 
-  it("should return ES11 for Chrome 111", () => {
-    assert.strictEqual(getESVersionForBrowser("chrome", "111"), 11);
+  it("should return ES14 for Chrome 111", () => {
+    assert.strictEqual(getESVersionForBrowser("chrome", "111"), 14);
   });
 
-  it("should return higher ES version for Chrome versions beyond defined mappings", () => {
+  it("should return ES15 for Chrome 120", () => {
     const esVersion = getESVersionForBrowser("chrome", "120");
     assert.strictEqual(
       esVersion,
-      11,
-      "Chrome 120 should map to ES11 (highest defined)",
+      15,
+      "Chrome 120 should map to ES15",
     );
   });
 });

tests/unit/helpers/parsers.test.js

@@ -22,5 +22,43 @@ describe("helpers/parsers.js", () => {
       assert(result.error);
       assert.strictEqual(result.ast, null);
     });
+
+    it("should parse nullish coalescing assignment with ES2021", () => {
+      const acorn = require("acorn");
+      const code = "let obj = {}; obj.key ??= 'default';";
+      const result = parseCode(code, { ecmaVersion: 12 }, acorn, "test.js");
+
+      assert.strictEqual(result.error, null);
+      assert(result.ast);
+      assert.strictEqual(result.ast.type, "Program");
+    });
+
+    it("should fail to parse nullish coalescing assignment with ES2020", () => {
+      const acorn = require("acorn");
+      const code = "let obj = {}; obj.key ??= 'default';";
+      const result = parseCode(code, { ecmaVersion: 11 }, acorn, "test.js");
+
+      assert(result.error);
+      assert.strictEqual(result.ast, null);
+    });
+
+    it("should parse static initialization blocks with ES2022", () => {
+      const acorn = require("acorn");
+      const code = 'class App { static { console.log("hi"); } }';
+      const result = parseCode(code, { ecmaVersion: 13 }, acorn, "test.js");
+
+      assert.strictEqual(result.error, null);
+      assert(result.ast);
+      assert.strictEqual(result.ast.type, "Program");
+    });
+
+    it("should fail to parse static initialization blocks with ES2021", () => {
+      const acorn = require("acorn");
+      const code = 'class App { static { console.log("hi"); } }';
+      const result = parseCode(code, { ecmaVersion: 12 }, acorn, "test.js");
+
+      assert(result.error);
+      assert.strictEqual(result.ast, null);
+    });
   });
 });