Dependencies

• Upgrade to TypeScript 4.1
• Upgrade fork-ts-checker-webpack-plugin : ^5.2.0 -> ^6.1.0
• Upgrade ts-loader : ^8.0.4 -> ^8.0.14

TypeScript 4.1

You may have type issues you need to fix while upgrading.

For example a common one is for void Promises you need to explicitly type the return type of the Promise :

new Promise<void>()

instead of

new Promise()

Anyway, your IDE & type checker will tell you what's going wrong and you'll be able to quick fix it !