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LibJS: Don't use presence of function params to identify function scope

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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.
This commit is contained in:
Luke Wilde 2025-06-17 15:38:31 +01:00 • committed by Jelle Raaijmakers
commit f12b6b258f
Notes: github-actions[bot] 2025-06-17 18:50:01 +00:00
2 changed files with 22 additions and 3 deletions
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21
Libraries/LibJS/Tests/regress/using-this-in-default-value-of-arrow-function-parameter.js Normal file
View file

@ -0,0 +1,21 @@
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]);
});