Implement the `parameters` function for some transforms

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f44e433) 94.53% compared to head (e925807) 94.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #259 +/- ## ========================================== + Coverage 94.53% 94.56% +0.03% ========================================== Files 46 46 Lines 1280 1288 +8 ========================================== + Hits 1210 1218 +8 Misses 70 70 ```

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