Struct rslint_core::groups::errors::NoUnsafeNegation

pub struct NoUnsafeNegation {}

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

impl NoUnsafeNegation

pub fn new() -> Self

Trait Implementations

impl Clone for NoUnsafeNegation

fn clone(&self) -> NoUnsafeNegation

Returns a copy of the value.

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

Performs copy-assignment from source.

impl CstRule for NoUnsafeNegation

fn check_node(&self, node: &SyntaxNode, ctx: &mut RuleCtx) -> Option<()>

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.

fn check_token(&self, token: &SyntaxToken, ctx: &mut RuleCtx) -> Option<()>

Check an individual token in the syntax tree. Defaults to doing nothing.

fn check_root(&self, root: &SyntaxNode, ctx: &mut RuleCtx) -> Option<()>

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.

impl Debug for NoUnsafeNegation

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

Formats the value using the given formatter.

impl Default for NoUnsafeNegation

fn default() -> NoUnsafeNegation

Returns the "default value" for a type.

impl<'de> Deserialize<'de> for NoUnsafeNegation

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error> where
    __D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Rule for NoUnsafeNegation

fn name(&self) -> &'static str

A unique, kebab-case name for the rule.

fn group(&self) -> &'static str

The name of the group this rule belongs to.

fn docs(&self) -> &'static str

Optional docs for the rule, an empty string by default

impl Serialize for NoUnsafeNegation

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

Serialize this value into the given Serde serializer.