fix: Fix TS complains

.vscode/settings.json

@@ -26,5 +26,6 @@
     "editor.codeActionsOnSave": {
       "quickfix.biome": "explicit"
     }
-  }
+  },
+  "typescript.tsdk": "node_modules/typescript/lib"
 }

src/blobHelpers.ts

@@ -5,6 +5,7 @@ import type {BlobPart} from "./BlobPart.js"
 
 import {isFunction} from "./isFunction.js"
 import {isAsyncIterable} from "./isAsyncIterable.js"
+import {isReadableStreamFallback} from "./isReadableStreamFallback.js"
 
 export const MAX_CHUNK_SIZE = 65536 // 64 KiB (same size chrome slice theirs blob into Uint8array's)
 
@@ -69,7 +70,7 @@ export const getStreamIterator = (
     return chunkStream(source)
   }
 
-  if (isFunction(source.getReader)) {
+  if (isReadableStreamFallback(source)) {
     return chunkStream(readStream(source))
   }
 

src/isReadableStreamFallback.ts

@@ -0,0 +1,9 @@
+import {isFunction} from "./isFunction.js"
+
+export const isReadableStreamFallback = (
+  value: unknown
+): value is ReadableStream =>
+  !!value &&
+  typeof value === "object" &&
+  !Array.isArray(value) &&
+  isFunction((value as ReadableStream).getReader)