Include buffer polyfil

package.json

@@ -23,5 +23,8 @@
     "jest": "^27.0.6",
     "ts-jest": "^27.0.3",
     "typescript": "^4.3.5"
+  },
+  "dependencies": {
+    "buffer": "^6.0.3"
   }
 }

src/mid/write.ts

@@ -1,3 +1,4 @@
+const Buffer = require('buffer/').Buffer
 import { Uint8Size, Uint16Size, Uint32Size } from '../interfaces/Constants'
 import MidContext from '../interfaces/MidContext'
 

src/mid/writeMidHead.ts

@@ -1,3 +1,4 @@
+const Buffer = require('buffer/').Buffer
 import MidContext from '../interfaces/MidContext'
 import { write16, write32 } from './write'
 

src/mid/writeMidTrackBlock.ts

@@ -1,3 +1,4 @@
+const Buffer = require('buffer/').Buffer
 import MidContext from '../interfaces/MidContext'
 import { write32 } from './write'
 

yarn.lock

@@ -770,6 +770,11 @@ balanced-match@^1.0.0:
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.2.tgz#e83e3a7e3f300b34cb9d87f615fa0cbf357690ee"
   integrity sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==
 
+base64-js@^1.3.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/base64-js/-/base64-js-1.5.1.tgz#1b1b440160a5bf7ad40b650f095963481903930a"
+  integrity sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==
+
 brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
@@ -820,6 +825,14 @@ [email protected], buffer-from@^1.0.0:
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
   integrity sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==
 
+buffer@^6.0.3:
+  version "6.0.3"
+  resolved "https://registry.yarnpkg.com/buffer/-/buffer-6.0.3.tgz#2ace578459cc8fbe2a70aaa8f52ee63b6a74c6c6"
+  integrity sha512-FTiCpNxtwiZZHEZbcbTIcZjERVICn9yq/pDFkTl95/AxzD1naBctN7YO68riM/gLSDY7sdrMby8hofADYuuqOA==
+  dependencies:
+    base64-js "^1.3.1"
+    ieee754 "^1.2.1"
+
 callsites@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/callsites/-/callsites-3.1.0.tgz#b3630abd8943432f54b3f0519238e33cd7df2f73"
@@ -1273,6 +1286,11 @@ [email protected]:
   dependencies:
     safer-buffer ">= 2.1.2 < 3"
 
+ieee754@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/ieee754/-/ieee754-1.2.1.tgz#8eb7a10a63fff25d15a57b001586d177d1b0d352"
+  integrity sha512-dcyqhDvX1C46lXZcVqCpK+FtMRQVdIMN6/Df5js2zouUsqG7I6sFxitIC+7KYK29KdXOLHdu9zL4sFnoVQnqaA==
+
 import-local@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/import-local/-/import-local-3.0.2.tgz#a8cfd0431d1de4a2199703d003e3e62364fa6db6"