[Task] Upgrade to TypeScript 3.8.0

[Jack-Works]

TypeScript 3.8.0 brings a group of amazing feature including

• New export * as ns Syntax
• Top-Level Await
• Private Fields
• import type syntax

Blocking by

• ESLint support (TypeScript 3.8 Syntax Support typescript-eslint/typescript-eslint#1436)
• Prettier support (Support TypeScript 3.8 prettier/prettier#7263)
• TypeScript 3.8.0 final release (TypeScript 3.8 Iteration Plan microsoft/TypeScript#34898)

Tasks

• Upgrade those packages
• Switch all possible imports to import type syntax.

[septs]

@Jack-Works The week upgrade?

[Jack-Works]

@Jack-Works The week upgrade?

No, we need to wait for prettier and eslint support new syntax