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+npm-prune(1) -- Remove extraneous packages
+==========================================
+
+## SYNOPSIS
+
+    npm prune [[<@scope>/]<pkg>...] [--production] [--dry-run] [--json]
+
+## DESCRIPTION
+
+This command removes "extraneous" packages.  If a package name is
+provided, then only packages matching one of the supplied names are
+removed.
+
+Extraneous packages are packages that are not listed on the parent
+package's dependencies list.
+
+If the `--production` flag is specified or the `NODE_ENV` environment
+variable is set to `production`, this command will remove the packages
+specified in your `devDependencies`. Setting `--no-production` will
+negate `NODE_ENV` being set to `production`.
+
+If the `--dry-run` flag is used then no changes will actually be made.
+
+If the `--json` flag is used then the changes `npm prune` made (or would
+have made with `--dry-run`) are printed as a JSON object.
+
+In normal operation with package-locks enabled, extraneous modules are
+pruned automatically when modules are installed and you'll only need
+this command with the `--production` flag.
+
+If you've disabled package-locks then extraneous modules will not be removed
+and it's up to you to run `npm prune` from time-to-time to remove them.
+
+## SEE ALSO
+
+* npm-uninstall(1)
+* npm-folders(5)
+* npm-ls(1)