Yarn workspaces: Hardhat unable to locate node_modules for sub packages

[tgunnoe]

Steps taken:
git clone https://github.com/nomiclabs/hardhat.git && cd hardhat

Drop test flake with dream2nix in repository, then:

git add flake.nix
nix flake show

you get a long list of packages, most of them are dependencies. and one defaultPackages for the root project.

nix build

build of the default package fails:

@nix { "action": "setPhase", "phase": "unpackPhase" }
  unpacking sources
  unpacking source archive /nix/store/7yz9x41x8rvdg8dmca52rmijzi243r73-5d7bixywasyxi7wgmacbx4w0sj77zkxi-source
  @nix { "action": "setPhase", "phase": "patchPhase" }
  patching sources
  @nix { "action": "setPhase", "phase": "d2nLoadFuncsPhase" }
  d2nLoadFuncsPhase
  @nix { "action": "setPhase", "phase": "d2nPatchPhase" }
  d2nPatchPhase
  @nix { "action": "setPhase", "phase": "configurePhase" }
  configuring
  installing: @changesets/cli
  installing: prettier
  installing: shelljs
  installing: typescript
  installing: wsrun
  @nix { "action": "setPhase", "phase": "buildPhase" }
  building
   
  > root@0.0.0 build /nix/store/lnmd1ka7rllp0p85pkchsjrr6i7phv23-root-0.0.0/lib/node_modules/root
  > tsc --build packages/hardhat-core packages/hardhat-docker packages/hardhat-ethers packages/hardhat-ethersc  an packages/hardhat-ganache packages/hardhat-solhint packages/hardhat-solpp packages/hardhat-truffle4 packag  es/hardhat-truffle5 packages/hardhat-vyper packages/hardhat-waffle packages/hardhat-web3 packages/hardhat-we  b3-legacy
   
  packages/hardhat-core/src/types/config.ts:15:25 - error TS2307: Cannot find module 'ethereumjs-util' or its   corresponding type declarations.
   
  15 import type { BN } from "ethereumjs-util";
                             ~~~~~~~~~~~~~~~~~
   
  packages/hardhat-core/src/types/config.ts:277:11 - error TS2503: Cannot find namespace 'Mocha'.
   
  277   mocha?: Mocha.MochaOptions;
                ~~~~~
   
  packages/hardhat-core/src/types/config.ts:285:10 - error TS2503: Cannot find namespace 'Mocha'.
   
  285   mocha: Mocha.MochaOptions;
               ~~~~~
   
  packages/hardhat-core/src/internal/util/abi-helpers.ts:1:22 - error TS2307: Cannot find module '@ethersproje  ct/abi' or its corresponding type declarations.
   
  1 import * as abi from "@ethersproject/abi";
                         ~~~~~~~~~~~~~~~~~~~~
   
  packages/hardhat-core/src/internal/hardhat-network/stack-traces/model.ts:1:29 - error TS2307: Cannot find mo  dule 'ethereumjs-util' or its corresponding type declarations.
   
  1 import { bufferToHex } from "ethereumjs-util";
                                ~~~~~~~~~~~~~~~~~
   
  packages/hardhat-core/src/internal/hardhat-network/stack-traces/message-trace.ts:1:30 - error TS2307: Cannot   find module '@ethereumjs/vm/dist/exceptions' or its corresponding type declarations.
   
  1 import type { VmError } from "@ethereumjs/vm/dist/exceptions";
                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   
  packages/hardhat-core/src/internal/hardhat-network/stack-traces/message-trace.ts:2:25 - error TS2307: Cannot   find module 'ethereumjs-util' or its corresponding type declarations.
   
  2 import type { BN } from "ethereumjs-util";
...

On and on.

Inspecting the generated dream-lock.json file, I see that all the packages from the yarn.lock file are included in it. Even the sub-packages' dependencies. And the only repo package listed is again the root project, which only lists its devDependencies.

I think at minimum, the project's sub packages dependencies should be listed under the defaultPackage, not just the devDependencies.

[tgunnoe]

Potentially related to #76

[tgunnoe]

I made this "wrapper" as I noticed that dream2nix listed all of the dependencies from packages.json as buildable, so I made a simple package.json and only included hardhat and it builds.

https://github.com/tgunnoe/hardhat-wrapper

However, dependencies aren't listed as buildable anymore with the recent discoverer work in #76

[tgunnoe]

Fixed basically with using lib2.