// Actual: { '42': undefined }
```
UglifyJS may modify the input which in turn may suppress those errors.
+- Later versions of JavaScript will throw `SyntaxError` with the following:
+ ```javascript
+ var await;
+ async function f() {
+ class A {
+ static p = await;
+ }
+ }
+ // SyntaxError: Unexpected reserved word
+ ```
+ UglifyJS may modify the input which in turn may suppress those errors.
+- Later versions of JavaScript will throw `SyntaxError` with the following:
+ ```javascript
+ var async;
+ for (async of []);
+ // SyntaxError: The left-hand side of a for-of loop may not be 'async'.
+ ```
+ UglifyJS may modify the input which in turn may suppress those errors.
}
for_of: {
+ input: {
+ var a = [ "PASS", 42 ];
+ a.p = "FAIL";
+ for (a of (null, a))
+ console.log(a);
+ }
+ expect_exact: 'var a=["PASS",42];a.p="FAIL";for(a of(null,a))console.log(a);'
+ expect_stdout: true
+ node_version: ">=0.12"
+}
+
+for_async_of: {
input: {
var async = [ "PASS", 42 ];
async.p = "FAIL";
}
expect_exact: 'var async=["PASS",42];async.p="FAIL";for(async of(null,async))console.log(async);'
expect_stdout: true
- node_version: ">=0.12"
+ node_version: ">=0.12 <16"
}
issue_3631_1: {
var label = createLabel(canBreak, canContinue);
canBreak = label.break || enableLoopControl(canBreak, CAN_BREAK);
canContinue = label.continue || enableLoopControl(canContinue, CAN_CONTINUE);
- var key = rng(10) ? "key" + loop : getVarName(NO_CONST);
var of = SUPPORT.for_of && rng(20) == 0;
+ var key;
+ if (rng(10)) {
+ key = "key" + loop;
+ } else if (bug_for_of_async && of) {
+ addAvoidVar("async");
+ key = getVarName(NO_CONST);
+ removeAvoidVar("async");
+ } else {
+ key = getVarName(NO_CONST);
+ }
var init = "";
if (!/^key/.test(key)) {
if (!(of && bug_for_of_var) && rng(10) == 0) init = "var ";
if (rng(5)) {
async = false;
generator = false;
+ if (bug_async_class_await && fixed) addAvoidVar("await");
s += " = " + createExpression(recurmax, NO_COMMA, stmtDepth, fixed ? canThrow : CANNOT_THROW);
+ if (bug_async_class_await && fixed) removeAvoidVar("await");
generator = save_generator;
async = save_async;
}
return ex.name == "SyntaxError" && ex.message == "Rest parameter must be last formal parameter";
};
}
+var bug_async_class_await = SUPPORT.async && SUPPORT.class_field && typeof sandbox.run_code("var await; async function f() { class A { static p = await; } }") != "string";
+var bug_for_of_async = SUPPORT.for_await_of && typeof sandbox.run_code("var async; for (async of []);") != "string";
var bug_for_of_var = SUPPORT.for_of && SUPPORT.let && typeof sandbox.run_code("try {} catch (e) { for (var e of []); }") != "string";
if (SUPPORT.destructuring && typeof sandbox.run_code("console.log([ 1 ], {} = 2);") != "string") {
beautify_options.output.v8 = true;