yarn2nix: add easy yarn & nodejs pkg overrides

Projects often require a specific major version of NodeJS, and sometimes
a specific yarn version. Since yarn2nix utilities are accessed from
nixpkgs now, there is no simple way to override versions of nodejs and
yarn without complex solutions like an overlay.

This adds `yarn` and `nodejs` as optional attribute arguments to
`mkYarnModules`, `mkYarnPackage`, and `mkYarnWorkspace`. They default to
the same versions that are currently being used, and the nodejs input to
yarn is overridden so that it will match if only `nodejs` is overridden
by the user.

These arguments will also cascade from `mkYarnWorkspace` ->
`mkYarnPackage` -> `mkYarnModules`, making per-package overrides very
simple.

1 files changed, 9 insertions, 3 deletions

diff --git a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
index 459de3928209a..3af3e43fe21d5 100644
--- a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
+++ b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
@@ -2,7 +2,7 @@
 , nodejs ? pkgs.nodejs
 , yarn ? pkgs.yarn
 , allowAliases ? pkgs.config.allowAliases
-}:
+}@inputs:
 
 let
   inherit (pkgs) stdenv lib fetchurl linkFarm callPackage git rsync makeWrapper runCommandLocal;
@@ -70,6 +70,8 @@ in rec {
     offlineCache ? importOfflineCache yarnNix,
     yarnFlags ? [ ],
     ignoreScripts ? true,
+    nodejs ? inputs.nodejs,
+    yarn ? inputs.yarn.override { nodejs = nodejs; },
     pkgConfig ? {},
     preBuild ? "",
     postBuild ? "",
@@ -169,6 +171,8 @@ in rec {
     src,
     packageJSON ? src + "/package.json",
     yarnLock ? src + "/yarn.lock",
+    nodejs ? inputs.nodejs,
+    yarn ? inputs.yarn.override { nodejs = nodejs; },
     packageOverrides ? {},
     ...
   }@attrs:
@@ -226,7 +230,7 @@ in rec {
         inherit name;
         value = mkYarnPackage (
           builtins.removeAttrs attrs ["packageOverrides"]
-          // { inherit src packageJSON yarnLock packageResolutions workspaceDependencies; }
+          // { inherit src packageJSON yarnLock nodejs yarn packageResolutions workspaceDependencies; }
           // lib.attrByPath [name] {} packageOverrides
         );
       })
@@ -241,6 +245,8 @@ in rec {
     yarnLock ? src + "/yarn.lock",
     yarnNix ? mkYarnNix { inherit yarnLock; },
     offlineCache ? importOfflineCache yarnNix,
+    nodejs ? inputs.nodejs,
+    yarn ? inputs.yarn.override { nodejs = nodejs; },
     yarnFlags ? [ ],
     yarnPreBuild ? "",
     yarnPostBuild ? "",
@@ -268,7 +274,7 @@ in rec {
         preBuild = yarnPreBuild;
         postBuild = yarnPostBuild;
         workspaceDependencies = workspaceDependenciesTransitive;
-        inherit packageJSON pname version yarnLock offlineCache yarnFlags pkgConfig packageResolutions;
+        inherit packageJSON pname version yarnLock offlineCache nodejs yarn yarnFlags pkgConfig packageResolutions;
       };
 
       publishBinsFor_ = unlessNull publishBinsFor [pname];