add __all__ to prepare for static type checkers and IDEs

[MarcSkovMadsen]

This adds a __all__ to __init__.py files as required for static type checking and intellisense in VS code. C.f. microsoft/pylance-release#2572 (comment)

[codecov]

Codecov Report

Merging #3411 (8189648) into master (b9c01ad) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 8189648 differs from pull request most recent head d2046b1. Consider uploading reports for the commit d2046b1 to get more accurate results

@@           Coverage Diff           @@
##           master    #3411   +/-   ##
=======================================
  Coverage   82.92%   82.93%           
=======================================
  Files         198      198           
  Lines       26999    27014   +15     
=======================================
+ Hits        22390    22405   +15     
  Misses       4609     4609           

Impacted Files	Coverage Δ
panel/layout/__init__.py	100.00% <ø> (ø)
panel/__init__.py	100.00% <100.00%> (ø)
panel/config.py	58.92% <100.00%> (+0.11%)	⬆️
panel/depends.py	80.76% <100.00%> (+0.24%)	⬆️
panel/interact.py	74.48% <100.00%> (+0.08%)	⬆️
panel/io/__init__.py	87.50% <100.00%> (+0.83%)	⬆️
panel/links.py	87.04% <100.00%> (+0.03%)	⬆️
panel/pane/__init__.py	100.00% <100.00%> (ø)
panel/param.py	86.85% <100.00%> (+0.02%)	⬆️
panel/pipeline.py	88.77% <100.00%> (+0.02%)	⬆️
... and 14 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b9c01ad...d2046b1. Read the comment docs.

[MarcSkovMadsen]

Both the __all__ and the redundant form seems to work.

it-works-type.mp4

[hoxbro]

I'm +1 on using __all__.

I would properly add __all__ directly below the imports, so it is clearly visible and not something you have to find at the end of the script.

[MarcSkovMadsen]

Releasing this PR together with the various docs PRs will be a major productivity boost for users of VS Code and similar IDEs :-)

[philippjfr]

Thanks @MarcSkovMadsen!

[MarcSkovMadsen]

Thanks @philippjfr and others for supporting.