JS-322 Write the TypeScript variant of RSPEC S2301

rules/S2301/java/metadata.json

@@ -1,3 +1,3 @@
 {
-  
+  "title": "Methods should not contain selector arguments"
 }

rules/S2301/java/rule.adoc

@@ -1,4 +1,4 @@
-include::../rule.adoc[]
+include::./why.adoc[]
 
 ifdef::env-github,rspecator-view[]
 

rules/S2301/java/why.adoc

@@ -0,0 +1,51 @@
+== Why is this an issue?
+
+A selector argument is a ``++boolean++`` argument that's used to determine which of two paths to take through a method. Specifying such a parameter may seem innocuous, particularly if it's well named.
+
+
+Unfortunately, developers calling the method won't see the parameter name, only its value. They'll be forced either to guess at the meaning or to take extra time to look the method up.
+
+
+Instead, separate methods should be written.
+
+
+This rule finds methods with a ``++boolean++`` that's used to determine which path to take through the method.
+
+
+=== Noncompliant code example
+
+[source,text,typescript]
+----
+function tempt(name: string, ofAge: boolean) {
+  if (ofAge) {
+    offerLiquor(name);
+  } else {
+    offerCandy(name);
+  }
+}
+
+// ...
+function corrupt() {
+  tempt("Joe", false); // does this mean not to temp Joe?
+}
+----
+
+
+=== Compliant solution
+
+[source,text,typescript]
+----
+function temptAdult(name: string) {
+  offerLiquor(name);
+}
+
+function temptChild(name: string) {
+    offerCandy(name);
+}
+
+// ...
+function corrupt() {
+  age < legalAge ? temptChild("Joe") : temptAdult("Joe");
+}
+----
+

rules/S2301/javascript/metadata.json

@@ -0,0 +1,3 @@
+{
+  
+}

rules/S2301/javascript/rule.adoc

@@ -0,0 +1,17 @@
+include::../rule.adoc[]
+
+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[]