Create a unique type in Typescript that represents a file name with its corresponding extension

Is there a way for me to specify the type of a filename field in my object? The file name will consist of a string representing the name of the uploaded file along with its extension.

For instance:

{
    icon: "my_icon.svg"
}

I am looking for a method to make sure that all filenames end with ".svg". Currently, my attempt at this is not successful. Here's what I have tried so far:

{
    icon: string & ".svg"
}

Answer №1

One approach to achieve this is by utilizing template literals:

let path: `${string}.svg`;

path = 'example';     // Error: Type '"example"' is not compatible with type '`${string}.svg`'.
path = 'image.svg';   // This assignment is valid

Answer №2

define type DocumentName = `${string}.svg` | `${string}.txt`

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