High memory consumption #168

Description

Cmpiling application with couple of reducers (20) and action creators (200) takes 2 GB RAM and requires passing --max-old-space-size to node when invoking tsc. Before fixing #164 it was much worse but it is still unuseable.

Steps to Reproduce

Steps to reproduce the behavior:

1. Download and unpack https://drive.google.com/file/d/1FUzk5NeRfxUvwd4eXCxIFcb7Scmvh9D4/view?usp=sharing
2. run npm i
3. run node --max-old-space-size=8192 ./node_modules/.bin/tsc --diagnostics
4. See the result

Expected behavior

Compilation of such project should be a piece of cake ;-)

Suggested solution(s)

Improve types or identify bug in TypeScript.

Project Dependencies

• Typesafe-Actions Version: 4.4.1
• TypeScript Version: 3.5.2
• tsconfig.json: included in the tgz

Environment (optional)

• OS: Debian Linux Buster
• Node Version: 12.4.0
• Package Manager and Version: npm 6.9.0