diff --git a/lib/multipart.js b/lib/multipart.js
index 27415a83b2..51ce8b2f4c 100644
--- a/lib/multipart.js
+++ b/lib/multipart.js
@@ -1,7 +1,5 @@
 "use strict";
 const utils = require("./utils");
-const _Error = require("./Error");
-const { StripeError } = _Error;
 // Method for formatting HTTP body for the multipart/form-data specification
 // Mostly taken from Fermata.js
 // https://github.com/natevw/fermata/blob/5d9732a33d776ce925013a265935facd1626cc88/fermata.js#L315-L343
diff --git a/lib/platform/WebPlatformFunctions.js b/lib/platform/WebPlatformFunctions.js
index 97219f30bd..9b57b1f950 100644
--- a/lib/platform/WebPlatformFunctions.js
+++ b/lib/platform/WebPlatformFunctions.js
@@ -36,8 +36,7 @@ class WebPlatformFunctions extends PlatformFunctions {
     }
     /** @override */
     tryBufferData(data) {
-        if (data.file.data.pipeThrough &&
-            typeof data.file.data.pipeThrough === 'function') {
+        if (data.file.data instanceof ReadableStream) {
             throw new Error('Uploading a file as a stream is not supported in non-Node environments. Please open or upvote an issue at github.com/stripe/stripe-node if you use this, detailing your use-case.');
         }
         return Promise.resolve(data);
diff --git a/src/multipart.ts b/src/multipart.ts
index f76eb97b6f..29abbbb972 100644
--- a/src/multipart.ts
+++ b/src/multipart.ts
@@ -1,7 +1,5 @@
 import utils = require('./utils');
 import _Error = require('./Error');
-import PlatformFunctions = require('./platform/PlatformFunctions');
-const {StripeError} = _Error;
 
 type MultipartCallbackReturn = any;
 type MultipartCallback = (
diff --git a/src/platform/WebPlatformFunctions.ts b/src/platform/WebPlatformFunctions.ts
index d3955b3d36..221de216a4 100644
--- a/src/platform/WebPlatformFunctions.ts
+++ b/src/platform/WebPlatformFunctions.ts
@@ -1,6 +1,4 @@
-import EventEmitter = require('events');
 import StripeEmitter = require('../StripeEmitter');
-import {emitWarning} from '../utils';
 import PlatformFunctions = require('./PlatformFunctions');
 
 /**
@@ -44,10 +42,7 @@ class WebPlatformFunctions extends PlatformFunctions {
 
   /** @override */
   tryBufferData(data: any): Promise<any> {
-    if (
-      data.file.data.pipeThrough &&
-      typeof data.file.data.pipeThrough === 'function'
-    ) {
+    if (data.file.data instanceof ReadableStream) {
       throw new Error(
         'Uploading a file as a stream is not supported in non-Node environments. Please open or upvote an issue at github.com/stripe/stripe-node if you use this, detailing your use-case.'
       );
diff --git a/test/PlatformFunctions.spec.ts b/test/PlatformFunctions.spec.ts
index a24606a385..523133b066 100644
--- a/test/PlatformFunctions.spec.ts
+++ b/test/PlatformFunctions.spec.ts
@@ -2,6 +2,8 @@
 
 require('../testUtils');
 
+import fs = require('fs');
+import path = require('path');
 import NodePlatformFunctions = require('../lib/platform/NodePlatformFunctions');
 import PlatformFunctions = require('../lib/platform/PlatformFunctions');
 
@@ -276,5 +278,76 @@ for (const platform in platforms) {
         done();
       });
     });
+
+    describe('tryBufferData', () => {
+      if (!isNodeEnvironment) {
+        // WebPlatformFunctions
+        it('should throw an error in web environments if streaming data is provided', () => {
+          if (process.versions.node < '18') {
+            console.log(
+              `'ReadableStream' is not available in the global scope for ${process.version}, skipping test.`
+            );
+            return;
+          }
+
+          const f = new ReadableStream();
+          const data = {
+            file: {
+              data: f,
+              name: 'test.pdf',
+              type: 'application/octet-stream',
+            },
+          };
+
+          expect(() => {
+            platformFunctions.tryBufferData(data);
+          }).to.throw();
+        });
+      } else {
+        // NodePlatformFunctions
+        it('should return data unmodified if not a file stream', () => {
+          const testFilename = path.join(
+            __dirname,
+            'resources/data/minimal.pdf'
+          );
+          const buf = fs.readFileSync(testFilename);
+
+          // Create Uint8Array from Buffer
+          const f = new Uint8Array(buf.buffer, buf.byteOffset, buf.length);
+
+          const data = {
+            file: {
+              data: f,
+              name: 'minimal.pdf',
+              type: 'application/octet-stream',
+            },
+          };
+
+          expect(
+            platformFunctions.tryBufferData(data)
+          ).to.eventually.deep.equal(data);
+        });
+
+        it('should load file streams into buffer', () => {
+          const testFilename = path.join(
+            __dirname,
+            'resources/data/minimal.pdf'
+          );
+          const f = fs.createReadStream(testFilename);
+
+          const data = {
+            file: {
+              data: f,
+              name: 'minimal.pdf',
+              type: 'application/octet-stream',
+            },
+          };
+
+          return expect(
+            platformFunctions.tryBufferData(data).then((d) => d.file.data)
+          ).to.eventually.have.nested.property('length', 739);
+        });
+      }
+    });
   });
 }