Enum LexicalDeclaration 

pub enum LexicalDeclaration {
    Const(VariableList),
    Let(VariableList),
    Using(VariableList),
    AwaitUsing(VariableList),
}

A lexical declaration defines variables that are scoped to the lexical environment of the variable declaration.

Variants

Const(VariableList)

A const variable creates a constant whose scope can be either global or local to the block in which it is declared.

An initializer for a constant is required. You must specify its value in the same statement in which it’s declared. (This makes sense, given that it can’t be changed later)

Let(VariableList)

A let variable is limited to a scope of a block statement, or expression on which it is used, unlike the var keyword, which defines a variable globally, or locally to an entire function regardless of block scope.

Just like const, let does not create properties of the window object when declared globally (in the top-most scope).

If a let declaration does not have an initializer, the variable is assigned the value undefined.

Using(VariableList)

A using declaration creates a block-scoped resource that is automatically disposed when control exits the block.

AwaitUsing(VariableList)

An await using declaration creates a block-scoped resource that is automatically disposed asynchronously when control exits the block.

Implementations

impl LexicalDeclaration

pub const fn variable_list(&self) -> &VariableList

Gets the inner variable list of the LexicalDeclaration

pub const fn is_const(&self) -> bool

Returns true if the declaration is a const declaration.

Trait Implementations

impl<'arbitrary> Arbitrary<'arbitrary> for LexicalDeclaration

fn arbitrary(u: &mut Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data.

fn arbitrary_take_rest(u: Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the entirety of the given unstructured data.

fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself.

impl Clone for LexicalDeclaration

fn clone(&self) -> LexicalDeclaration

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LexicalDeclaration

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for LexicalDeclaration

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'a> From<&'a LexicalDeclaration> for NodeRef<'a>

fn from(node: &'a LexicalDeclaration) -> NodeRef<'a>

Converts to this type from the input type.

impl<'a> From<&'a mut LexicalDeclaration> for NodeRefMut<'a>

fn from(node: &'a mut LexicalDeclaration) -> NodeRefMut<'a>

Converts to this type from the input type.

impl From<LexicalDeclaration> for Declaration

fn from(lex: LexicalDeclaration) -> Self

Converts to this type from the input type.

impl From<LexicalDeclaration> for ForLoopInitializer

fn from(list: LexicalDeclaration) -> Self

Converts to this type from the input type.

impl PartialEq for LexicalDeclaration

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for LexicalDeclaration

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for LexicalDeclaration

impl ToInternedString for LexicalDeclaration

fn to_interned_string(&self, interner: &Interner) -> String

Converts a given element to a string using an interner.

impl VisitWith for LexicalDeclaration

fn visit_with<'a, V>(&'a self, visitor: &mut V) -> ControlFlow<V::BreakTy>

where V: Visitor<'a>,

Visit this node with the provided visitor.

fn visit_with_mut<'a, V>( &'a mut self, visitor: &mut V, ) -> ControlFlow<V::BreakTy>

where V: VisitorMut<'a>,

Visit this node with the provided visitor mutably, allowing the visitor to modify private fields.