eolas/zk/Any.md

---
tags:
  - typescript
---

# Any

`any` is a TS-specific type that we can think of it as a higher level parent to
all the other types that exist in TypeScript.

It means in effect that either no type declaration has been asserted or that the
TS compiler cannot infer the type that you mean. Because `any` does not have a
data type it is equivalent to all the individual scalar and reference types
combined. In TS this kind of type is called a **supertype**, and specific types
that actually correspond to a scalar or reference type are known as
**subtypes**. `any`is the supertype of all types and `string` for example is a
subtype of `any`.

> Every value of `string` can be assigned to its supertype`any` but not every
> value of `any` can be assigned to its subtype `string`

You can declare `any` as a type if you wish however it is discouraged because it
effectively undermines the whole purpose of TS. Doing so is basically the same
thing as declaring a value in normal JS - there is no designation at left hand
assignation of which type the data belongs to.

> `any` reflects JavaScript's overarching flexibility; you can see it as a
> backdoor to a world where you want neither tooling nor type safety.

`any` means you can escape errors during development. If you are using custom
types/interfaces and you keep getting an annoying error saying that property X
doesn't exist on type,, `any` will allow you to overcome it until you go back
later and refine.