Fix TypeScript error while using SvelteKit.

[berzanorg]

Hey, everyone!

Problem

When SvelteKit is chosen as an accompanying UI project, the CLI produces a template project with a TypeScript error.

What this pull request does

This pull request solves the problem by creating hooks.server.ts file instead of hooks.server.js file when the accompanying UI project uses TypeScript.

If the project doesn't use TypeScript, it still creates hooks.server.js file as before.

To reproduce the error:

1 - Install zkapp-cli globally by running the command below.

npm install --global zkapp-cli

2 - Create a project by running the command below.

zk project my-test-project

3 - Choose svelte option as an accompanying UI project.

4 - Choose Skeleton project option as Svelte app template.

5 - Choose Yes, using TypeScript syntax option.

6 - Choose any additional options you want.

7 - Open ui/tsconfig.json file and you will see the error message.

Screenshot