Struct PreferReadonlyRule 

pub struct PreferReadonlyRule;

Type-aware rule that flags private members that are never reassigned and can therefore be marked readonly.

Faithful port of the tsgolint builtin prefer-readonly rule. The upstream Go implementation walks each class scope, tracks every modification of a private member through class/instance property accesses, and at scope exit reports the private, non-readonly, non-accessor, non-computed members that were never modified outside the constructor (modifications that occur directly inside the constructor still allow a readonly mark).

In this architecture the host performs the per-class data-flow walk and the Rust rule receives the result as a raw fact on each member declaration (__memberIsReassigned). All of the eligibility decisions (visibility, readonly/accessor/computed gating, and the onlyInlineLambdas option) stay in Rust; only the raw “was this member reassigned outside the constructor” query is delegated.

Upstream also reports on private constructor parameter properties (constructor(private x = 7)), which are surfaced in TS-ESTree as TSParameterProperty nodes rather than PropertyDefinition. We therefore listen on both kinds and normalize them.

Trait Implementations

impl Clone for PreferReadonlyRule

fn clone(&self) -> PreferReadonlyRule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PreferReadonlyRule

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

Formats the value using the given formatter.

impl Default for PreferReadonlyRule

fn default() -> PreferReadonlyRule

Returns the “default value” for a type.

impl RustLintRule for PreferReadonlyRule

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

Returns the stable rule name exposed to JavaScript and diagnostics.

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

Returns the short prose description used in generated rule metadata.

fn messages(&self) -> &'static [RuleMessage]

Returns the message catalog keyed by message_id.

fn listeners(&self) -> &'static [&'static str]

Returns the AST node kinds this rule wants the host to send.

fn has_suggestions(&self) -> bool

Returns whether diagnostics from this rule may include suggested fixes.

fn check(&self, ctx: &mut RuleContext<'_>, node: &LintNode)

Checks one host-provided node and records diagnostics in ctx.

fn requires_type_texts(&self) -> bool

Returns whether the host should attach TypeScript-rendered type text.

fn meta(&self) -> RuleMeta

Builds the serializable rule metadata exposed to binding layers.

impl Copy for PreferReadonlyRule