feat: add dynamic loader for buffer

hyperid.js

@@ -3,7 +3,14 @@
 const uuidv4 = require('./uuid-node')
 const parser = require('uuid-parse')
 const maxInt = Math.pow(2, 31) - 1
-const Buffer = require('buffer').Buffer
+const Buffer = loadBuffer()
+function loadBuffer () {
+  const b = require('buffer')
+  // use third party module if no buffer module
+  return b && b.Buffer
+    ? b.Buffer
+    : require('buffer/').Buffer
+}
 const base64Padding = Buffer.from('==', 'base64')
 
 function hyperid (opts) {

package.json

@@ -12,7 +12,7 @@
   ],
   "scripts": {
     "typescript": "tsc --project ./test/tsconfig.json",
-    "test": "standard && tape test/test.js test/uniqueness.js | tap-dot && npm run typescript"
+    "test": "standard && tape test/test.js test/uniqueness.js test/buffer.ts | tap-dot && npm run typescript"
   },
   "repository": {
     "type": "git",
@@ -41,11 +41,13 @@
     "standard": "^16.0.3",
     "tap-dot": "^2.0.0",
     "tape": "^5.0.0",
-    "typescript": "^4.3.4"
+    "typescript": "^4.3.4",
+    "proxyquire": "^2.1.3"
   },
   "dependencies": {
     "uuid": "^8.3.2",
-    "uuid-parse": "^1.1.0"
+    "uuid-parse": "^1.1.0",
+    "buffer": "^5.2.1"
   },
   "browser": {
     "./uuid-node.js": "./uuid-browser.js"

test/buffer.ts

@@ -0,0 +1,16 @@
+const hyperid = require('..')
+const test = require('tape')
+const proxyquire = require('proxyquire')
+
+test('require buffer', function (t) {
+  t.plan(2);
+
+  const instance = hyperid()
+  const id = instance()
+  t.ok(id)
+
+  proxyquire('../hyperid', { 'buffer': { Buffer: null } });
+  const instance2 = hyperid()
+  const id2 = instance2()
+  t.ok(id2)
+})