Peer/Dev Dependency Resolution Error

<!--- Provide a general summary of the issue in the Title above -->

I have two packages in my monorepo, one of which dev-depends and peer-depends on the other. For this example, I've swapped out the real names with `a` and `b`.



`a/package.json`



```json

{

  "name": "a",

  "version": "0.1.0",

  "main": "dist/cjs/index.js",

  "types": "dist/cjs/index.d.ts",

  "license": "Apache-2.0"

}

```



`b/package.json`



```json

{

  "name": "b",

  "version": "0.1.0",

  "main": "dist/cjs/index.js",

  "types": "dist/cjs/index.d.ts",

  "license": "Apache-2.0",

  "devDependencies": {

    "a": "^0.1.0"

  },

  "peerDependencies": {

    "a": "^0.1.0"

  }

}

```



Upon bootstrapping I encounter the following error:



```

lerna ERR! npm install exited 1 in 'b'

lerna ERR! npm install stderr:

npm WARN ERESOLVE overriding peer dependency

npm WARN Found: a@undefined

npm WARN node_modules/a

npm WARN   peer a@"^0.1.0" from the root project

npm WARN 

npm WARN Could not resolve dependency:

npm WARN peer a@"^0.1.0" from the root project

npm ERR! code E404

npm ERR! 404 Not Found - GET https://registry.npmjs.org/a - Not found

npm ERR! 404 

npm ERR! 404  'a@^0.1.0' is not in the npm registry.

npm ERR! 404 You should bug the author to publish it (or use the name yourself!)

npm ERR! 404 

npm ERR! 404 Note that you can also install from a

npm ERR! 404 tarball, folder, http url, or git url.

```



It appears that––for some reason––the version of `a` is `undefined`, hence the package is not resolved. Because the package does not exist on NPM, the installation fails altogether.



Any help / advice would be greatly appreciated! Thank you!



<details><summary>lerna.json</summary><p>

<!-- browsers demand the next line be empty -->



```json

{

  "$schema": "https://json.schemastore.org/lerna",

  "npmClient": "npm",

  "packages": ["packages/*"],

  "version": "0.1.0"

}

```

</p></details>



## Your Environment

<!--- Include as many relevant details about the environment you experienced the bug in -->



| Executable | Version |

| ---: | :--- |

| `lerna --version` | 3.22.1 |

| `npm --version`  | 7.5.2 |

| `node --version` | 14.15.5 |



| OS | Version |

| --- | --- |

| macOS Catalina | 10.15.7 |

[]