include::../why.adoc[]

include::../how.adoc[]

=== Code examples

==== Noncompliant code example

[source,javascript,diff-id=1,diff-type=noncompliant]
----
class Person {
  private birthYear: number; // Noncompliant

  constructor(birthYear: number) {
    this.birthYear = birthYear;
  }
}
----

==== Compliant solution

[source,javascript,diff-id=1,diff-type=compliant]
----
class Person {
  private readonly birthYear: number;

  constructor(birthYear: number) {
    this.birthYear = birthYear;
  }
}
----

== Resources

=== Documentation

* TypeScript Documentation - https://www.typescriptlang.org/docs/handbook/2/classes.html#readonly[readonly]

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::../message.adoc[]

'''
== Comments And Links
(visible only on this page)

include::../comments-and-links.adoc[]

endif::env-github,rspecator-view[]