Struct HostObject 

#[non_exhaustive]
pub struct HostObject {
    pub class_name: &'static str,
    pub marker: &'static str,
    pub is_boxed_primitive: bool,
}

A single host-object identity: the JavaScript constructor name, the dedicated identity marker key stamped onto the constructed record, and whether the identity denotes a boxed primitive wrapper.

The marker is the __smelt_<name> key that gives the constructed record its distinct identity. instanceof resolves through this key, and the runtime for-in / Object.keys filters hide records carrying it so a host object never leaks its internal marker keys as enumerable properties.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

class_name: &'static str

The JavaScript constructor / class name ("WeakMap", "ArrayBuffer").

marker: &'static str

The dedicated identity marker key ("__smelt_weakmap").

is_boxed_primitive: bool

Whether this identity is a boxed primitive wrapper (new Number(1)).

Boxed wrappers are distinct from the same-named coercion calls (Number(x)), which lower to primitive values. The wrapper object has typeof === "object", so the runtime typeof narrowing must miss it while instanceof still resolves through the marker.

Trait Implementations

impl Clone for HostObject

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 HostObject

impl Debug for HostObject

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

Formats the value using the given formatter.

impl Eq for HostObject

impl PartialEq for HostObject

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for HostObject