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doc/manual: replace bad advice about package options and overlays

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Gavin John 2025-01-05 14:02:54 -05:00
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nixos/doc/manual/development/option-declarations.section.md
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@ -99,7 +99,7 @@ mkPackageOption pkgs "name" { default = [ "path" "in" "pkgs" ]; example = "liter
Creates an Option attribute set for an option that specifies the package a module should use for some purpose. Creates an Option attribute set for an option that specifies the package a module should use for some purpose.
**Note**: You shouldn’t necessarily make package options for all of your modules. You can always overwrite a specific package throughout nixpkgs by using [nixpkgs overlays](https://nixos.org/manual/nixpkgs/stable/#chap-overlays). **Note**: You should make package options for your modules, where applicable. While one can always overwrite a specific package throughout nixpkgs by using [nixpkgs overlays](https://nixos.org/manual/nixpkgs/stable/#chap-overlays), they slow down nixpkgs evaluation significantly and are harder to debug when issues arise.
The package is specified in the third argument under `default` as a list of strings The package is specified in the third argument under `default` as a list of strings
representing its attribute path in nixpkgs (or another package set). representing its attribute path in nixpkgs (or another package set).