perf: faster startup time (#1542)

I noticed that libp2p takes over 200ms to require. When using the CLI with no daemon we never start the IPFS node so libp2p is required but unused. This PR lazily requires libp2p when start is called, which means that if the node is never started, you do not suffer the 200ms it takes to require the library.

License: MIT
Signed-off-by: Alan Shaw <alan@tableflip.io>

Author: alanshaw

src/core/components/libp2p.js

@@ -1,7 +1,5 @@
 'use strict'
 
-// libp2p-nodejs gets replaced by libp2p-browser when webpacked/browserified
-const Node = require('../runtime/libp2p-nodejs')
 const promisify = require('promisify-es6')
 const get = require('lodash/get')
 const defaultsDeep = require('@nodeutils/defaults-deep')
@@ -59,6 +57,9 @@ module.exports = function libp2p (self) {
             libp2pDefaults
           )
 
+          // Required inline to reduce startup time
+          // Note: libp2p-nodejs gets replaced by libp2p-browser when webpacked/browserified
+          const Node = require('../runtime/libp2p-nodejs')
           return new Node(libp2pOptions)
         }