import and export a TypeScript type alias from a .d.ts module

Is there a way to create a file named vue-number.d.ts containing the following declaration:

export type vueNumber = number | '';

and then use this type alias in multiple TypeScript modules?

If I attempt to do so, the import statement gives an error:

'vue-number.d.ts' is not a module

How can I properly export and import a TypeScript type so that I can use it as if it were declared in the same module, like this: let age: vueNumber = '';?

Answer №1

To make use of a declaration file, simply delete the export keyword from within the vue-number.d.ts file:

type vueNum = number | '';

... and then reference the declaration file like so:

///<reference path="vue-number.d.ts"/>
let total: vueNum = '';

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