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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.