feat: enhance multipart-form file handling by filtering empty values in parser and stringifier (#8444)

packages/bruno-lang/v2/src/bruToJson.js

@@ -266,7 +266,7 @@ const mapPairListToKeyValPairsMultipart = (pairList = [], parseEnabled = true) =
     if (pair.value.startsWith('@file(') && pair.value.endsWith(')')) {
       let filestr = pair.value.replace(/^@file\(/, '').replace(/\)$/, '');
       pair.type = 'file';
-      pair.value = filestr.split('|');
+      pair.value = filestr.split('|').filter(Boolean);
     }
 
     return pair;

packages/bruno-lang/v2/src/jsonToBru.js

@@ -560,7 +560,7 @@ ${indentString(body.sparql)}
             }
 
             if (item.type === 'file') {
-              const filepaths = Array.isArray(item.value) ? item.value : [];
+              const filepaths = (Array.isArray(item.value) ? item.value : []).filter(Boolean);
               const filestr = filepaths.join('|');
 
               const value = `@file(${filestr})`;

packages/bruno-lang/v2/tests/bruToJson.spec.js

@@ -485,5 +485,55 @@ body:multipart-form {
       const output = parser(input);
       expect(output).toEqual(expected);
     });
+
+    it('parses an empty multipart-form file value as an empty array', () => {
+      const input = `
+body:multipart-form {
+  file: @file()
+}
+`;
+
+      const expected = {
+        body: {
+          multipartForm: [
+            {
+              name: 'file',
+              value: [],
+              enabled: true,
+              type: 'file',
+              contentType: ''
+            }
+          ]
+        }
+      };
+
+      const output = parser(input);
+      expect(output).toEqual(expected);
+    });
+
+    it('drops empty entries when parsing multiple multipart-form file paths', () => {
+      const input = `
+body:multipart-form {
+  file: @file(a.txt||b.txt)
+}
+`;
+
+      const expected = {
+        body: {
+          multipartForm: [
+            {
+              name: 'file',
+              value: ['a.txt', 'b.txt'],
+              enabled: true,
+              type: 'file',
+              contentType: ''
+            }
+          ]
+        }
+      };
+
+      const output = parser(input);
+      expect(output).toEqual(expected);
+    });
   });
 });

packages/bruno-lang/v2/tests/jsonToBru.spec.js

@@ -54,6 +54,48 @@ describe('jsonToBru stringify', () => {
     });
   });
 
+  describe('body:multipart-form file values', () => {
+    it('stringifies an empty file value without a leading pipe', () => {
+      const input = {
+        body: {
+          multipartForm: [
+            {
+              name: 'file',
+              value: [],
+              enabled: true,
+              type: 'file',
+              contentType: ''
+            }
+          ]
+        }
+      };
+
+      const output = stringify(input);
+      expect(output).toContain('file: @file()');
+      expect(output).not.toContain('@file(|');
+    });
+
+    it('drops empty entries when stringifying multiple file paths', () => {
+      const input = {
+        body: {
+          multipartForm: [
+            {
+              name: 'file',
+              value: ['', '/path/to/file.csv'],
+              enabled: true,
+              type: 'file',
+              contentType: ''
+            }
+          ]
+        }
+      };
+
+      const output = stringify(input);
+      expect(output).toContain('file: @file(/path/to/file.csv)');
+      expect(output).not.toContain('@file(|');
+    });
+  });
+
   describe('multi-line values', () => {
     it('handles multi-line values in URL, headers, params, and vars', () => {
       const input = {