chore: remove node buffers

There's no need to use node buffers, everything is `Uint8Array`
compatible now.

Needs the `libp2p-interfaces-compliance-tests` upgrade from
#173 before
CI will pass.

.aegir.js

@@ -5,7 +5,6 @@
  * set up a libp2p instance for browser nodes to relay through
  * before tests start
  */
-const path = require('path')
 
 const Libp2p = require('libp2p')
 const PeerId = require('peer-id')
@@ -45,28 +44,18 @@ const before = async () => {
       }
     }
   })
-  
+
   await libp2p.start()
 }
 
 const after = async () => {
   await libp2p.stop()
 }
 
-/** @type {import('aegir').Options["build"]["config"]} */
-const esbuild = {
-  inject: [path.join(__dirname, './scripts/node-globals.js')]
-}
-
 /** @type {import('aegir').PartialOptions} */
 module.exports = {
   test: {
     before,
-    after,
-    browser: {
-      config: {
-        buildConfig: esbuild
-      }
-    }
+    after
   }
 }

package.json

@@ -58,7 +58,6 @@
     "@typescript-eslint/parser": "^3.0.2",
     "aegir": "^36.0.2",
     "benchmark": "^2.1.4",
-    "buffer": "^6.0.3",
     "chai": "^4.2.0",
     "chai-spies": "^1.0.0",
     "delay": "^5.0.0",

test/gossip.spec.js

@@ -1,10 +1,10 @@
 'use strict'
 /* eslint-env mocha */
 
-const { Buffer } = require('buffer')
 const { expect } = require('chai')
 const sinon = require('sinon')
 const delay = require('delay')
+const { fromString: uint8ArrayFromString } = require('uint8arrays/from-string')
 
 const { GossipsubDhi } = require('../src/constants')
 const {
@@ -42,7 +42,7 @@ describe('gossip', () => {
     // set spy
     sinon.spy(nodeA, '_pushGossip')
 
-    await nodeA.publish(topic, Buffer.from('hey'))
+    await nodeA.publish(topic, uint8ArrayFromString('hey'))
 
     await new Promise((resolve) => nodeA.once('gossipsub:heartbeat', resolve))
 
@@ -84,7 +84,7 @@ describe('gossip', () => {
     const graft = { graft: [{ topicID: topic }] }
     nodeA.control.set(peerB, graft)
 
-    await nodeA.publish(topic, Buffer.from('hey'))
+    await nodeA.publish(topic, uint8ArrayFromString('hey'))
 
     expect(nodeA._piggybackControl.callCount).to.be.equal(1)
     // expect control message to be sent alongside published message