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33 lines
1 KiB
Nix
33 lines
1 KiB
Nix
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{ config, lib, flake-modules-core-lib, ... }:
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let
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inherit (lib)
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mkOption
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types
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;
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inherit (flake-modules-core-lib)
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mkSubmoduleOptions
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;
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in
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{
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options = {
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flake = mkSubmoduleOptions {
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overlay = mkOption {
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# uniq should be ordered: https://github.com/NixOS/nixpkgs/issues/147052
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# also update description when done
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type = types.uniq (types.functionTo (types.functionTo (types.lazyAttrsOf types.unspecified)));
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# This eta expansion exists for the sole purpose of making nix flake check happy.
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apply = f: final: prev: f final prev;
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default = _: _: { };
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defaultText = lib.literalExpression or lib.literalExample ''final: prev: {}'';
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description = ''
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An overlay.
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Note that this option's type is not mergeable. While overlays can be
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composed, the order of composition is significant, but the module
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system does not guarantee deterministic definition ordering.
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'';
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};
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};
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};
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}
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