TypeScript issue when using parameters

[daankennes]

Hi,

Thank you for your work on this library.

I run into a TypeScript problem when using parameters. For example this line

<p>{$t('common.welcomeTo_0', { applicationName: 'My application' })}</p>

will produce this TypeScript error: Object literal may only specify known properties, and 'applicationName' does not exist in type 'PayloadDefault'.

Not sure if this is a bug or if I'm overlooking something.

Daan

[soguertler]

Have a look at #60