Struct rslint_core::groups::errors::NoUnsafeNegation [−][src]
pub struct NoUnsafeNegation {}
Expand description
Deny the use of !
on the left hand side of an instanceof
or in
expression where it is ambiguous.
JavaScript precedence is higher for logical not than it is for in or instanceof. Oftentimes you see
expressions such as !foo instanceof bar
, which most of the times produces unexpected behavior.
precedence will group the expressions like (!foo) instanceof bar
. Most of the times the developer expects
the expression to check if foo
is not an instance of bar
however.
Incorrect Code Examples
if (!foo instanceof String) {
}
if (!bar in {}) {
}
Implementations
Trait Implementations
Check an individual node in the syntax tree.
You can use the match_ast
macro to make matching a node to an ast node easier.
The reason this uses nodes and not a visitor is because nodes are more flexible,
converting them to an AST node has zero cost and you can easily traverse surrounding nodes.
Defaults to doing nothing. Read more
Check an individual token in the syntax tree. Defaults to doing nothing. Read more
Check the root of the tree one time.
This method is guaranteed to only be called once.
The root’s kind will be either SCRIPT
or MODULE
.
Defaults to doing nothing. Read more
Returns the “default value” for a type. Read more
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
__D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer. Read more
A list of tags present on this rule. Empty by default.
Whether this rule is recommended, this is a simple helper around Self::tags
.
Auto Trait Implementations
impl RefUnwindSafe for NoUnsafeNegation
impl Send for NoUnsafeNegation
impl Sync for NoUnsafeNegation
impl Unpin for NoUnsafeNegation
impl UnwindSafe for NoUnsafeNegation
Blanket Implementations
Mutably borrows from an owned value. Read more
Whether this implementor has acknowledged the 1.1.0 update to
unerase
’s documented implementation requirements. Read more