Enum GlobalPresence 

#[non_exhaustive]
pub enum GlobalPresence {
    Present,
    Absent,
    Unknown,
}

Compile-time availability of a global object member in the active target profile.

The current target is a deterministic non-DOM, Node-compatible environment (the default generated Rust test profile from the global-objects plan). A feature probe such as "X" in globalThis may only fold to a literal when the answer is known for that profile; an Unknown member must keep its runtime check so erased and runtime answers never disagree.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Present

The member is a recognized builtin that exists in the non-DOM profile, so "X" in globalThis is statically true.

Absent

The member is a recognized builtin that is intentionally absent from the non-DOM profile (browser/DOM-only surfaces), so "X" in globalThis is statically false.

Unknown

The member is not in any recognition registry, so its presence cannot be decided at compile time and the probe must stay a runtime check.

Trait Implementations

impl Clone for GlobalPresence

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for GlobalPresence

impl Debug for GlobalPresence

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for GlobalPresence

impl PartialEq for GlobalPresence

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for GlobalPresence