build + develop on nodejs workspaces

assuming a package.json with workspaces

package.json

{
  "name": "my-workspaces",
  "workspaces": [
    "my-tool"
    "my-first-app"
    "my-second-app"
  ]
}

define package set via workspaces.nix

{config, lib, dream2nix, ...}: {

  imports = [
    dream2nix.modules.nodejs.workspaces
    dream2nix.modules.nodejs.package-lock
  ];

  src = ./.;

  # Allows to manipulate builds of workspace members and their dependencies
  overrides.local.path = ./overrides;
}

create default.nix entry point

default.nix

{
  nixpkgs ? import <nixpkgs> {},
  dream2nix ?
    import
    (builtins.fetchTarball "https://dream2nix.dev/tarball/1.0")
    {inherit nixpkgs;},
}: {
  packages = {
    inherit (dream2nix.lib.mkPackageSet ./workspaces.nix)
      my-tool
      my-first-app
      my-second-app
      ;
  };
}

configure package builds via ./overrides/

Files in ./overrides/ must always be named like the the package they apply to.

Manipulate my-tool via ./overrides/my-tool.nix

{config, ...}: {

  # include python from nixpkgs
  deps = {nixpkgs, ...}: {
    inherit (nixpkgs) python;
  };

  buildInputs = [
    config.deps.python
  ];
}

Manipulate my-first-app via ./overrides/my-first-app.nix

{config, ...}: {

  # include my-tool from the local workspace
  deps = {workspace, ...}: {
    inherit (workspace) my-tool;
  };

  buildInputs = [
    config.deps.my-tool
  ];
}