init: use npx for extended initializers (#20303)

PR-URL: https://github.com/npm/npm/pull/20303
Credit: @jdalton
Reviewed-By: @zkat

1 files changed, 23 insertions, 1 deletions

diff --git a/lib/init.js b/lib/init.js
index 000fa1a5b..32e73298f 100644
--- a/lib/init.js
+++ b/lib/init.js
@@ -2,15 +2,37 @@
 
 module.exports = init
 
+var path = require('path')
 var log = require('npmlog')
 var npm = require('./npm.js')
+var npx = require('libnpx')
 var initJson = require('init-package-json')
 var output = require('./utils/output.js')
 var noProgressTillDone = require('./utils/no-progress-while-running').tillDone
+var usage = require('./utils/usage')
 
-init.usage = 'npm init [--force|-f|--yes|-y]'
+init.usage = usage(
+  'init',
+  '\nnpm init [--force|-f|--yes|-y]' +
+  '\nnpm init <@scope> (same as `npx <@scope>/create`)' +
+  '\nnpm init [<@scope>/]<pkg> (same as `npx [<@scope>/]create-<pkg>`)'
+)
 
 function init (args, cb) {
+  if (args.length) {
+    var NPM_PATH = path.resolve(__dirname, '../bin/npm-cli.js')
+    var initerName = args[0]
+    var packageName = /^@[^/]+$/.test(initerName)
+      ? initerName + '/create'
+      : initerName.replace(/^(@[^/]+\/)?/, '$1create-')
+
+    var npxArgs = [process.argv0, '[fake arg]', '--always-spawn', packageName, ...process.argv.slice(4)]
+    var parsed = npx.parseArgs(npxArgs, NPM_PATH)
+
+    return npx(parsed)
+      .then(() => cb())
+      .catch(cb)
+  }
   var dir = process.cwd()
   log.pause()
   var initFile = npm.config.get('init-module')