Using polyfill for Buffer in browsers

package.json

@@ -28,6 +28,7 @@
         "@fluencelabs/avm-runner-interface": "^0.2.0",
         "async": "3.2.0",
         "bs58": "4.0.1",
+        "buffer": "^6.0.3",
         "cids": "0.8.1",
         "it-length-prefixed": "3.0.1",
         "it-pipe": "1.1.0",
@@ -40,7 +41,8 @@
         "peer-id": "=0.15.4",
         "rxjs": "^7.3.0",
         "ts-pattern": "^3.3.3",
-        "uuid": "8.3.0"
+        "uuid": "8.3.0",
+        "browser-or-node": "^2.0.0"
     },
     "devDependencies": {
         "@fluencelabs/aqua": "^0.5.3-258",

src/internal/Buffer.ts

@@ -0,0 +1,4 @@
+import { isBrowser } from 'browser-or-node';
+import { Buffer as BufferPolyfill } from 'buffer';
+
+export default isBrowser ? BufferPolyfill : Buffer;

src/internal/FluenceConnection.ts

@@ -26,6 +26,7 @@ import PeerId from 'peer-id';
 import { Multiaddr } from 'multiaddr';
 import { all as allow_all } from 'libp2p-websockets/src/filters';
 import { Connection } from 'libp2p-interfaces/src/topology';
+import Buffer from './Buffer';
 
 export const PROTOCOL_NAME = '/fluence/particle/2.0.0';
 

src/internal/FluencePeer.ts

@@ -30,6 +30,7 @@ import { AvmRunner, InterpreterResult, LogLevel } from '@fluencelabs/avm-runner-
 import { AvmRunnerBackground } from '@fluencelabs/avm-runner-background';
 import { defaultSigGuard, Sig } from './builtins/Sig';
 import { registerSig } from './_aqua/services';
+import Buffer from './Buffer';
 
 /**
  * Node of the Fluence network specified as a pair of node's multiaddr and it's peer id

src/internal/Particle.ts

@@ -20,6 +20,7 @@ import { CallResultsArray, LogLevel } from '@fluencelabs/avm-runner-interface';
 import log from 'loglevel';
 import { ParticleContext } from './commonTypes';
 import { dataToString, jsonify } from './utils';
+import Buffer from './Buffer';
 
 export class Particle {
     id: string;

src/internal/utils.ts

@@ -18,7 +18,7 @@ import log from 'loglevel';
 import { CallServiceData, CallServiceResult, CallServiceResultType, ResultCodes } from './commonTypes';
 import { FluencePeer } from './FluencePeer';
 import { Particle, ParticleExecutionStage } from './Particle';
-import { LogLevel as AvmLoglevel } from '@fluencelabs/avm-runner-interface';
+import Buffer from './Buffer';
 
 export const MakeServiceCall = (fn: (args: any[]) => CallServiceResultType) => {
     return (req: CallServiceData): CallServiceResult => {