On the browser bundle size must be kept in check, it is best to only import what you'll use.
import { assert } from"tsafe/assert";import { typeGuard } from"tsafe/typeGuard";//Type can be imported from the indeximporttype { ReturnType } from"tsafe";
CLI Runtime
If you are in Node or on Deno, bundle size is irrelevant, you should use a single import.