Trait RenamedVariable

pub trait RenamedVariable:
    Sized
    + Sealed
    + Clone
    + Send
    + Sync
    + 'static {
    // Required methods
    fn new_private(sym: Atom) -> Self;
    fn to_id(&self) -> (Atom, SyntaxContext);
}

Available on crate feature __ecma and (crate features __ecma_transforms or __testing_transform) only.

A trait that is used to represent a renamed variable. For renamer_keep_contexts, the syntax contexts of the replacements should be correct (unique), while for hygiene (which calls renamer), the resulting syntax contexts are irrelevant. This type is used to handle both cases without code duplication by using HashMap<Id, impl RenamedVariable> everywhere:

• For renamer, HashMap<Id, Atom> is used (and SyntaxContext::empty() isn’t store unnecessarily). All replaced idents have the same SyntaxContext #0.
• For renamer_keep_contexts, HashMap<Id, Id> is used. All replaced idents have a unique SyntaxContext.

Required Methods

fn new_private(sym: Atom) -> Self

Potentially create a new private variable, depending on whether the consumer cares about the syntax context after the renaming.

fn to_id(&self) -> (Atom, SyntaxContext)

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl RenamedVariable for (Atom, SyntaxContext)

fn new_private(sym: Atom) -> (Atom, SyntaxContext)

fn to_id(&self) -> (Atom, SyntaxContext)

Implementors

impl RenamedVariable for Atom