Not that there's any real utility in it for this module, but it would prevent Svelte's language server (in default configuration) from warning about it:
Could not find a declaration file for module 'fa-svelte'. '/[...]/node_modules/fa-svelte/index.js' implicitly has an 'any' type. Try npm i --save-dev @types/fa-svelte if it exists or add a new declaration (.d.ts) file containing declare module 'fa-svelte';
Not that there's any real utility in it for this module, but it would prevent Svelte's language server (in default configuration) from warning about it: