fix: jsonata $base64decode/$base64encode in Web Worker (#2275)

tests/browser/02_ops.js

@@ -218,6 +218,7 @@ module.exports = {
         testOpHtml(browser, "JSON Beautify", "{a:1}", ".json-dict .json-literal", "1");
         // testOp(browser, "JSON Minify", "test input", "test_output");
     // testOp(browser, "JSON to CSV", "test input", "test_output");
+        testOp(browser, "Jsonata Query", '{"a": "SGVsbG8gV29ybGQh"}', '"Hello World!"', ["$base64decode($.a)"]);
     // testOp(browser, "JWT Decode", "test input", "test_output");
     // testOp(browser, "JWT Sign", "test input", "test_output");
     // testOp(browser, "JWT Verify", "test input", "test_output");

tests/operations/tests/Jsonata.mjs

@@ -548,4 +548,27 @@ TestRegister.addTests([
             },
         ],
     },
+    // Base64 functions (issue #2063)
+    {
+        name: "Jsonata: $base64decode",
+        input: "{}",
+        expectedOutput: '"Hello World!"',
+        recipeConfig: [
+            {
+                op: "Jsonata Query",
+                args: ['$base64decode("SGVsbG8gV29ybGQh")'],
+            },
+        ],
+    },
+    {
+        name: "Jsonata: $base64encode",
+        input: "{}",
+        expectedOutput: '"SGVsbG8gV29ybGQh"',
+        recipeConfig: [
+            {
+                op: "Jsonata Query",
+                args: ['$base64encode("Hello World!")'],
+            },
+        ],
+    },
 ]);