# Is there any library similar to Typescript for Julia?
**URL:** https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160
**Category:** Teaching & Outreach
**Tags:** question
**Created:** [April 27, 2022, 5:38pm UTC](https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160 "2022-04-27T17:38:58Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@anon29721930](https://discourse.julialang.org/u/anon29721930)
#### Post date: [April 27, 2022, 5:38pm UTC](https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160/1 "2022-04-27T17:38:58Z")
Is there any library similar to Typescript for Julia?
#### example.ts
```julia-auto
let a: number = 1 ;
console.log(a) // output: 1
```
#### example.jl
```julia-auto
# Assign the value 10 to the variable x
julia> x = 10
10
```
#### example.jl
```julia-auto
# Assign the value 10 to the variable x
julia> x:number = 10
10
```
#### reference
- [https://www.typescriptlang.org/](https://www.typescriptlang.org/)
- [TS Playground - An online editor for exploring TypeScript and JavaScript](https://www.typescriptlang.org/play)
---
### Author:  [@rikh](https://discourse.julialang.org/u/rikh)
#### Post date: [April 27, 2022, 6:10pm UTC](https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160/2 "2022-04-27T18:10:38Z")
> [@anon29721930](#):
>
> Is there any library similar to Typescript for Julia?
Julia has a type system built-in, so there is no need to build a library on top for type support.
For example, the TypeScript website shows
```ts
interface Account {
id: number
displayName: string
version: 1
}
function welcome(user: Account) {
console.log(user.id)
}
```
In Julia, you can write this as
```julia
julia> Base.@kwdef struct Account
id::Number
name::String
version::Int = 1
end;
julia> function welcome(user::Account)
println("Welcome $(user.name)!")
end;
julia> user = Account(; id=1, name="Sally")
Account(1, "Sally", 1)
julia> welcome(user)
Welcome Sally!
```
---
### Author:  [@Henrique\_Becker](https://discourse.julialang.org/u/Henrique_Becker)
#### Post date: [April 27, 2022, 6:47pm UTC](https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160/3 "2022-04-27T18:47:10Z")
Julia supports annotating the type of local variables and [intends to support the same for global variables](https://github.com/JuliaLang/julia/issues/964) types:
```julia
julia> let
x::Int = 1
end
1
julia> y::Int = 1
ERROR: syntax: type declarations on global variables are not yet supported
Stacktrace:
[1] top-level scope at REPL[2]:1
```
In fact, I am using Julia 1.5.3, maybe the most recent Julia versions already support annotating the type of global variables.
---
### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [April 27, 2022, 8:26pm UTC](https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160/4 "2022-04-27T20:26:56Z")
> [@Henrique\_Becker](#):
>
> In fact, I am using Julia 1.5.3, maybe the most recent Julia versions already support annotating the type of global variables.
v1.8 does
---
### Author:  [@anon29721930](https://discourse.julialang.org/u/anon29721930)
#### Post date: [July 2, 2022, 2:58am UTC](https://discourse.julialang.org/t/is-there-any-library-similar-to-typescript-for-julia/80160/5 "2022-07-02T02:58:15Z")
please, close topic here.