LibJS: Throw on assignment of an const variable

Was stubbed out as an assert, should be handled with a runtime exception.
Author: https://github.com/bgianfo Commit: 0d41e542b7 Pull-request: https://github.com/SerenityOS/serenity/pull/1773 Reviewed-by: https://github.com/awesomekling
2025-06-10 10:01:13 +09:00 · 2020-04-12 15:50:49 -07:00 · 2020-04-12 15:50:49 -07:00 · 0d41e542b7 · 2024-07-19 07:38:42 +09:00
commit 0d41e542b7
parent 8e87d340c3
2 changed files with 29 additions and 2 deletions
--- a/Libraries/LibJS/Tests/variable-declaration.js
+++ b/Libraries/LibJS/Tests/variable-declaration.js
@ -0,0 +1,25 @@
+try {
+
+    const ConstantValue = 1;
+    try {
+        ConstantValue = 2;
+    } catch (e) { 
+        assert(e.name === "TypeError");
+        assert(e.message === "Assignment to constant variable");
+        assert(ConstantValue === 1);
+    }
+
+    // Make sure we can define new constants in inner scopes.
+    //
+    const ConstantValue2 = 1;
+
+    do 
+    {
+        const ConstantValue2 = 2;
+    }
+    while (false)
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}