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+# `acceptDependencies` to allow deduplication of conditionally compatible dependency versions.
+
+## Summary
+
+Provide a way for a module author to declare alternative versions of dependencies
+that can be used.
+
+## Motivation
+
+npm does not currently provide a method for a package which supports `node.js >=4` to
+allow upgrade of a dependency which requires `node.js >=6` unless they also bump their
+own minimum verion.  This proposal would allow such authors to declare that an alternative
+version of the dependency can be used if that version is already being installed by another
+dependency.  Generally this would be used when the dependency is only a breaking change due
+to dropping support for old node.js versions or when other breaking changes do not apply to
+the local module.
+
+Take `make-dir` for example.  Maybe you maintain a package which still needs to support
+node.js 4.x.  This restricts you to `make-dir@1.3.0`.  This proposal allows you to
+declare that `make-dir@2.x` or `make-dir@3.x` will also work.  When users install your
+module they will get `make-dir@1.3.0` by default, but if they also install another
+dependency which requires `make-dir@3.0.0` your project will use the upgraded version
+as well.  The idea is that if the updated version is being installed by the application
+it is no longer necessary to function on node.js 4.x.
+
+## Detailed Explanation
+
+npm would support reading `acceptDependencies` object from package.json.  This object
+would declaring alternative versions of packages listed in `dependencies`,
+`devDependencies`, `optionalDependencies` or `peerDependencies`.
+
+Example `package.json`:
+```js
+{
+    "name": "my-node4-package",
+    "engines": {
+        "node": ">=4"
+    },
+    "dependencies": {
+        "make-dir": "^1.3.0"
+    },
+    "acceptDependencies": {
+        "make-dir": "2.x - 3.x"
+    }
+}
+```
+
+Creating a node.js 8 application and installing this package alone would produce the
+following `npm ls`:
+```
+example-app@0.1.0 /usr/src/npm/example-app
+└─┬ my-node4-package@0.1.0
+  └─┬ make-dir@1.3.0
+    └── pify@3.0.0
+```
+
+Now suppose you are also going to use `make-dir` directly, so you run `npm i make-dir`,
+installing the latest, 3.0.0.  With current versions of npm this will result in `npm ls`
+showing:
+```
+example-app@0.1.0 /usr/src/npm/example-app
+├─┬ make-dir@3.0.0
+│ └── semver@6.3.0
+└─┬ my-node4-package@0.1.0
+  └─┬ make-dir@1.3.0
+    └── pify@3.0.0
+```
+
+Future versions with support for `acceptDependencies` would show:
+```
+example-app@0.1.0 /usr/src/npm/example-app
+├─┬ make-dir@3.0.0
+│ └── semver@6.3.0
+└─┬ my-node4-package@0.1.0
+  └── make-dir@3.0.0 deduped
+```
+
+
+## Rationale
+
+Some maintainers want to provide support for the oldest possible version of node.js.
+This often causes a large number of duplicate packages to be installed.  Older versions
+of the dependencies may be slower at runtime and cause a large expansion of install size
+for applications that largely require up to date dependencies.  This proposal intends to
+reduce the trade-off required to support old versions of node.js.
+
+## Alternatives
+
+1. `resolutions` field of yarn.
+2. System-wide `.npmresolutions` to allow global upgrade / remapping to specific versions.
+3. Proposed `overrides` field of npm (ref #39)
+
+All of these options can be more powerful than the idea of `acceptDependencies`.  The
+with `resolutions` and `.npmresolutions` is that they would only work if users of a
+module determine that the dependency can and should be upgraded.  This can result in
+footguns, takes control out of the maintainers hands.  `overrides` shifts the authority
+from users to module authors but would require introducing condition expansion into
+`package-lock.json`.
+
+## Implementation
+
+I could use advice on this section.  Some thoughts:
+
+* npm must prevent `acceptDependencies` from breaking `peerDependencies`.  For example
+  if a `pkg1` depends on `lib1` and `lib1-plugin1`, `lib1-plugin1` has a peerDependency
+  on `lib1`.  It is valid for `pkg1` to specify an allowed semver-major upgrade to both
+  `lib1` and `lib1-plugin1`.  If `app1` installs `pkg1` and the upgraded version of
+  `lib1` but not `lib1-plugin1`, this may mean that `pkg1` has to continue using the
+  original version of `lib1` to satisfy the peer dependency of `lib1-plugin1`.
+* A `--force-latest` flag would probably be nice - if I'm running the latest release of
+  node.js I may want to assume all `acceptDependencies` are compatible with my platform.
+
+## Unresolved Questions and Bikeshedding
+
+* Should `acceptDependencies` explicitly reject anything that is not a semver-range?
+  What should happen if other values are used for `acceptDependencies` versions?
+  Install from git, etc.
+* Handling of module groups could use more thought.  `peerDependencies` should help
+  ensure improper deduplication does not occur.  Open to suggestions on how to better
+  support groups of modules - allow `module1@2.x` and `module1-plugin@2.x` to both be
+  installed if either is otherwise used.
+* What should be done with modules listed in `acceptDependencies` that are not
+  dependencies of the local module?
+* Should `null` have special meaning for optional dependencies of direct dependents? Lets
+  say I want to use `small-pkg1` but it has an optional dependency on `huge-module`.
+  Could we say that this optional module is unwanted by adding `"huge-module": null` to
+  our own `acceptDependencies`?  Would need to determine scope of these nullified optional
+  dependencies.