fix: node 18 compat issue in the node fetch client

.vscode/settings.json

@@ -10,6 +10,6 @@
   "files.insertFinalNewline": false,
 
   "search.exclude": {
-    "coverage": true,
+    "coverage": true
   }
 }

src/targets/node/fetch/client.ts

@@ -73,7 +73,12 @@ export const fetch: Client = {
 
           if (param.fileName) {
             includeFS = true;
-            push(`formData.append('${param.name}', await fs.openAsBlob('${param.fileName}'));`);
+
+            // Whenever we drop support for Node 18 we can change this blob work to use
+            // `fs.openAsBlob('filename')`.
+            push(
+              `formData.append('${param.name}', await new Response(fs.createReadStream('${param.fileName}')).blob());`,
+            );
           }
         });
 

src/targets/node/fetch/fixtures/multipart-data.js

@@ -1,7 +1,7 @@
 import fs from 'fs';
 
 const formData = new FormData();
-formData.append('foo', await fs.openAsBlob('src/fixtures/files/hello.txt'));
+formData.append('foo', await new Response(fs.createReadStream('src/fixtures/files/hello.txt')).blob());
 formData.append('bar', 'Bonjour le monde');
 
 const url = 'https://httpbin.org/anything';

src/targets/node/fetch/fixtures/multipart-file.js

@@ -1,7 +1,7 @@
 import fs from 'fs';
 
 const formData = new FormData();
-formData.append('foo', await fs.openAsBlob('src/fixtures/files/hello.txt'));
+formData.append('foo', await new Response(fs.createReadStream('src/fixtures/files/hello.txt')).blob());
 
 const url = 'https://httpbin.org/anything';
 const options = {method: 'POST', body: formData};