fix optional dependencies when using devDeps #170
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* install: Don't omit any deps of dev deps if --only=dev
At the moment, npm will NOT install a dependency that is both a
production and a development dependency in the same tree if
`--only=dev`.
Consider the following scenario:
- `package1` has `prod-dependency` in `dependencies`
- `package1` has `dev-dependency` in `devDependencies`
- `prod-dependency` has `sub-dependency` in `dependencies`
- `dev-dependency` has `sub-dependency` in `dependencies`
So both `prod-dependency` and `dev-dependency` directly depend on
`sub-dependency`. Since `sub-dependency` is required by at least one
production dependency, then npm won't consider it as "only a dev
dependency", and therefore running `npm install --only=dev` will result
in the following tree:
```
package1/
node_modules/
dev-dependency
```
Notice that `sub-dependency` has ben completely omitted from the tree,
even though `dev-dependency` clearly requires it, and therefore it will
not work.
This commit makes `--only=dev` always install required dependencies of
dev dependencies, so you never end up with a broken tree.
For a more real-world reproducible example, try to run `npm install
--only=dev` in
https://github.com/resin-io/etcher/tree/a338c6e60a10aad00008febfe92e2556dcf586c6.
The resulting tree will be completely broken, but we would not have
identified this if several install scripts wouldn't fail as a result.
PR-URL: #69
Credit: @jviotti
Reviewed-By: @iarna
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Not sure what's going on here but tests started failing after #69 got merged so I'm making a new PR to fix it.