Out of date docs or incorrect types?

🐛 Bug Report

When using typescript there are two issues. Once when using the syntax from the prefetching docs: https://www.smooth-code.com/open-source/loadable-components/docs/prefetching/ and the other when trying to preload.

To Reproduce

// Argument of type '() => string' is not assignable to parameter of type '(props: {}) => Promise<DefaultComponent<{}>>'.
// Type 'string' is not assignable to type 'Promise<DefaultComponent<{}>>'.
export const User = () => loadable(() => './User')

and

export const User = () => loadable(() => import('./User'))

// Property 'preload' does not exist on type '() => ComponentType<{ fallback?: Element | undefined; }>'.
User.preload()

Expected behavior

Typescript should not error and docs should be updated

Details

## System:
 - OS: Linux 4.4 Ubuntu 16.04.2 LTS (Xenial Xerus)
 - CPU: (16) x64 AMD Ryzen 7 1700X Eight-Core Processor
 - Memory: 8.81 GB / 15.95 GB
 - Shell: 4.3.46 - /bin/bash
## Binaries:
 - Node: 10.15.0 - ~/.nvm/versions/node/v10.15.0/bin/node
 - Yarn: 1.9.4 - ~/.yarn/bin/yarn
 - npm: 6.4.1 - ~/.nvm/versions/node/v10.15.0/bin/npm

[theKashey]

:working:

[pvinis]

@theKashey I guess?