Thanks for the PR, @chkt!

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Codecov Report

Merging #1496 into master will decrease coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1496      +/-   ##
==========================================
- Coverage   95.57%   95.30%   -0.27%     
==========================================
  Files         143      143              
  Lines        6689     6736      +47     
  Branches     1916     1938      +22     
==========================================
+ Hits         6393     6420      +27     
- Misses        106      110       +4     
- Partials      190      206      +16     

This would disallow:

export type Constructor<T = {}> = new (...args: any[]) => T;

and force:

export type Constructor<T = {}> = new (...args: any[])=> T;

The space before the arrow is removed.
I know styling is subjective, but the first one looks better :)

Also, it's not what the docs say it's the default: https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/type-annotation-spacing.md

Please use the issue search.
This has been fixed in master #1663