ladybird/Libraries/LibJS/Tests/regress/using-this-in-default-value-of-arrow-function-parameter.js
Luke Wilde f12b6b258f LibJS: Don't use presence of function params to identify function scope
Instead, we can just use the scope type to determine if a scope is a
function scope.

This fixes using `this` for parameter default values in arrow functions
crashing. This happened by `uses_this_from_environment` was not set in
`set_uses_this`, as it didn't think it was in a function scope whilst
parsing parameters.

Fixes closing modal dialogs causing a crash on https://www.ikea.com/

No test262 diff.

Reverts the functional part of 08cfd5f, because it was a workaround for
this issue.
2025-06-17 20:48:45 +02:00

21 lines
534 B
JavaScript

test("using this in default value of arrow function parameter does not crash", () => {
const result = [];
class A {
constructor() {
this.foo = (bar = this.value1, baz = this.value2, value3 = this.value3) => {
result.push(bar);
result.push(baz);
result.push(value3);
};
this.value1 = 20;
this.value2 = 30;
this.value3 = 40;
}
}
new A().foo(10);
expect(result).toEqual([10, 30, 40]);
});