Preload with TypeScript not working

[daarxwalker]

Describe the bug
Preload with using TypeScript not working

Logs
index.svelte:9 was created without expected prop 'data'

To Reproduce
Not working

Working

Expected behavior
Should work same with TypeScript

Information about your Sapper Installation:

• Your browser and the version: Chrome latest

• Your operating system: macOS Catalina 10.15.5

• Your hosting environment: Local

• Sapper version: 0.27.16

• Svelte version: 3.24.0

• Rollup

Severity
Can't preload if svelte component using TypeScript

Additional context
#1241
Found this, but it's closed and no solution.

[Conduitry]

Duplicate of #760.