nocite all entries of a biblatex entry type

Question

I am writing my cv and although I only want to print some of my @unpublished and @inproceedings entries in my bibliography, I do want to print all of my @article entries.
Is there any way in which I can nocite all entries of a specific type (@article in this case)?
Consider that I have my entries in separate files depending on its type. Here is a MWE:
documentclass{article}

usepackage[backend=biber]{biblatex}

addbibresource{articles.bib}
addbibresource{talks.bib}
addbibresource{unpublished.bib}

begin{document}

% How do I nocite all @article entries?
nocite{<all @article entries>}

nocite{sometalk, someothertalk}

nocite{someunpublished, someotherunpublished}

% This should print all articles
printbibliography[title=Articles, type=article]

% This should print sometalk and someothertalk
printbibliography[title=Talks, type=inproceedings]

% This should print someunpublished and someotherunpublished
printbibliography[title=Unpublished, type=unpublished]

end{document}

moewe · Answer

nocite only supports listing entry keys you want to add to your bibliography or nocite{*} to allow all available entries from your .bib file(s) to be added.
There is no way to tell nocite to pick only @articles or entries with other properties, see nocite{*} for single bibdatasources with biblatex/biber, Is it possible to add entries to the bibliography based on keyword using Biblatex/Biber and within the document code?.
There is, however, a workaround in newer versions of Biber that allows you to clear out entries you don't want with a sourcemap. This will result in the expected output.
You will need the starnocited keyword that was added in biblatex 3.15/Biber 2.15 (https://github.com/plk/biber/issues/319).
documentclass{article}

usepackage[backend=biber, defernumbers=true]{biblatex}

DeclareSourcemap{
  maps[datatype=bibtex, overwrite]{
    map{
      pernottype{article}
      step[starnocited=true, final]
      step[entrynull]
    }
  }
}

addbibresource{biblatex-examples.bib}

begin{document}
nocite{*}

nocite{westfahl:space,gaonkar:in}

nocite{salam} % we don't want moraux

% This should print all articles
printbibliography[title=@article, type=article]

% This should print salam but not moraux
printbibliography[title=@inproceedings, type=inproceedings]

% This should print westfahl:space gaonkar:in and nothing else
printbibliography[title=@incollection, type=incollection]

end{document}

This clears out all entries that are not @articles that are only present because of nocite{*} (i.e. entries that were not cited or nocited explicitly with their key)

nocite all entries of a biblatex entry type

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