Union and intersection types are convenient but can make code harder to read and maintain. So if a particular union or intersection is used in multiple places, the use of a type alias is recommended.


== Noncompliant Code Example

----
function foo(x:string|null|number) { // Noncompliant
  // ...
}
function bar(x:string|null|number) {
  // ...
}
function zoo(): string|null|number {
  return null;
}
----


== Compliant Solution

----
type MyType = string | null | number;

function foo(x: MyType) {
  // ...
}
function bar(x: MyType) {
  // ...
}
function zoo(): MyType {
  return null;
}
----



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== Comments And Links
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