added type aliases

[rosesyrett]

solves https://github.com/dls-controls/tickit/issues/117

[codecov[bot]]

Codecov Report

Merging #144 (70cad53) into master (6e22b8d) will increase coverage by 0.01%. The diff coverage is 100.00%.

:exclamation: Current head 70cad53 differs from pull request most recent head 815a14e. Consider uploading reports for the commit 815a14e to get more accurate results

@@            Coverage Diff             @@
##           master     #144      +/-   ##
==========================================
+ Coverage   92.48%   92.50%   +0.01%     
==========================================
  Files          45       45              
  Lines        1225     1227       +2     
==========================================
+ Hits         1133     1135       +2     
  Misses         92       92              

Impacted Files	Coverage Δ
src/tickit/core/components/component.py	96.29% <100.00%> (ø)
src/tickit/core/management/schedulers/base.py	97.95% <100.00%> (ø)
src/tickit/core/typedefs.py	91.83% <100.00%> (+0.34%)	:arrow_up:

[tpoliaw]

Is it not possible to have the aliases declared in the same way as the other typedefs?

As in using NewTypes? I think that would mean you had to wrap every use with ComponentOutput(...) where they're used to avoid upsetting the type checker. TypeAliases mean the rest of the code doesn't have to change.