feat: use Arborist for dedupe and prune

docs/content/cli-commands/npm-dedupe.md

@@ -60,6 +60,8 @@ Modules
 Note that this operation transforms the dependency tree, but will never
 result in new modules being installed.
 
+Using `npm find-dupes` will run the command in dryRun mode.
+
 ### See Also
 
 * [npm ls](/cli-commands/ls)

lib/config/cmd-list.js

@@ -33,7 +33,6 @@ var affordances = {
   'isntall-clean': 'ci',
   'dist-tags': 'dist-tag',
   'apihelp': 'help',
-  'find-dupes': 'dedupe',
   'upgrade': 'update',
   'udpate': 'update',
   'login': 'adduser',
@@ -70,6 +69,7 @@ var cmdList = [
   'outdated',
   'prune',
   'pack',
+  'find-dupes',
   'dedupe',
   'hook',
 

lib/dedupe.js

@@ -1,19 +1,24 @@
 // dedupe duplicated packages, or find them in the tree
-const util = require('util')
+const npm = require('./npm.js')
 const Arborist = require('@npmcli/arborist')
-const rimraf = util.promisify(require('rimraf'))
-const reifyOutput = require('./utils/reify-output.js')
 const usageUtil = require('./utils/usage.js')
+const reifyOutput = require('./utils/reify-output.js')
 
 const usage = usageUtil('dedupe', 'npm dedupe')
-
 const completion = (cb) => cb(null, [])
 
 const cmd = (args, cb) => dedupe(args).then(() => cb()).catch(cb)
 
-const dedupe = async args => {
-  require('npmlog').warn('coming soon!')
-  throw new Error('not yet implemented')
+const dedupe = async (args) => {
+  const dryRun = args.dryRun || npm.flatOptions.dryRun
+  const where = npm.prefix
+  const arb = new Arborist({
+    ...npm.flatOptions,
+    path: where,
+    dryRun
+  })
+  await arb.dedupe()
+  reifyOutput(arb)
 }
 
 module.exports = Object.assign(cmd, { usage, completion })

lib/find-dupes.js

@@ -0,0 +1,9 @@
+// dedupe duplicated packages, or find them in the tree
+const dedupe = require('./dedupe.js')
+const usageUtil = require('./utils/usage.js')
+
+const usage = usageUtil('find-dupes', 'npm find-dupes')
+const completion = (cb) => cb(null, [])
+const cmd = (args, cb) => dedupe({ dryRun: true } , cb)
+
+module.exports = Object.assign(cmd, { usage, completion })

lib/prune.js

@@ -1,20 +1,25 @@
-// prune extraneous packages.
-const util = require('util')
+// prune extraneous packages
+const npm = require('./npm.js')
 const Arborist = require('@npmcli/arborist')
-const rimraf = util.promisify(require('rimraf'))
-const reifyOutput = require('./utils/reify-output.js')
 const usageUtil = require('./utils/usage.js')
 
-const usage = usageUtil('prune',
-  'npm prune [[<@scope>/]<pkg>...] [--production]')
+const reifyOutput = require('./utils/reify-output.js')
 
-const completion = require('./utils/completion/installed-deep.js')
+const usage = usageUtil('prune',
+  'npm prune [[<@scope>/]<pkg>...] [--production]'
+)
+const completion = (cb) => cb(null, [])
 
-const cmd = (args, cb) => prune(args).then(() => cb()).catch(cb)
+const cmd = (args, cb) => prune().then(() => cb()).catch(cb)
 
-const prune = async args => {
-  require('npmlog').warn('coming soon!')
-  throw new Error('not yet implemented')
+const prune = async () => {
+  const where = npm.prefix
+  const arb = new Arborist({
+    ...npm.flatOptions,
+    path: where
+  })
+  await arb.prune()
+  reifyOutput(arb)
 }
 
 module.exports = Object.assign(cmd, { usage, completion })