nested workspaces

[meesvandongen]

The workspace setting is used for several concepts;

• Multiple packages inside a monorepo.
• Multiple configurations (ie browser mode, unit test, happy-dom) for a single package.

In monorepo environments, you might want to use both of these concepts at the same time. But one of them is package-scoped, and one makes more sense for the whole repository.

Currently, Vitest will look at the configuration and workspace configuration in the root. It will use the workspace config to determine the location of vitest configuration files (and will ignore further workspace configuration files/settings). Here is a repository to demonstrate this behavior: https://github.com/meesvandongen/vitest-workspace-test

├── pkg
│   └── 1
│       ├── test.jsdom.spec.ts // only passes in jsdom
│       ├── test.node.spec.ts // only passes in node
│       └── vitest.config.ts // declares workspaces for environments {jsdom, node}
└── vitest.config.ts // declares pkg/* workspaces

The test suite will fail if run in the root directory, but pass in the "1" directory.

It would be useful if vitest could also look at workspace files/settings in these locations (and recursively do the same thing for those files).