Combining string types with spaces and accepted types in TypeScript, potentially recursive

type AcceptedClass = "one" | "two" | "three";

type ClassNameType = `${AcceptedClass} ${ClassNameType}`;

const className: ClassNameType = "one two three";
const className2: ClassNameType = "two one three one three";
const className3: ClassNameType = "three";
const className4: ClassNameType = "three one two three one two";

Trying to define a type similar to the code snippet above, But encountering an error

Type alias 'ClassNameType' is circularly referencing itself.ts(2456)

Is it not feasible to create these types in TypeScript?

Answer №1

It is important to understand that circular dependencies cannot exist when dealing with type literals.

Consider the following analogy:

  • In TypeScript, ${ClassName} needs to be replaced with all possible values for ClassName
  • If you use ${ClassName} within the definition of ${ClassName}, it will create an infinite loop of iterations
  • This cycle would continue endlessly

Templated types are designed to be finite, preventing unbounded types like the one you are attempting to create. TypeScript has a strict limit of 100k terms in a union type.

One potential workaround could involve utilizing a limited solution like this:

const type ClassName = `${AcceptedClass} ${AcceptedClass} ${AcceptedClass} ${AcceptedClass}`;

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