Add missing buffer APIs

CHANGELOG.yaml

@@ -3,6 +3,7 @@ unreleased:
     - Add support for configuring module resolver based on environment
   new features:
     - Enhanced performance when operating on buffers in Node environment
+    - Added missing buffer APIs to expose a uniform interface across environments
 
 5.1.1:
   date: 2024-08-01

lib/vendor/buffer/index.browser.js

@@ -1,9 +1,20 @@
 const SpecificBuffer = require('./buffer');
 const buffer = require('buffer/');
 
+// Using 32-bit implementation value from Node
+// https://github.com/nodejs/node/blob/main/deps/v8/include/v8-primitive.h#L126
+const K_STRING_MAX_LENGTH = (1 << 28) - 16;
+
 module.exports = {
     Buffer: SpecificBuffer(buffer.Buffer),
     SlowBuffer: buffer.SlowBuffer,
     INSPECT_MAX_BYTES: buffer.INSPECT_MAX_BYTES,
-    kMaxLength: buffer.kMaxLength
+    kMaxLength: buffer.kMaxLength,
+    kStringMaxLength: K_STRING_MAX_LENGTH,
+    constants: {
+        MAX_LENGTH: buffer.kMaxLength,
+        MAX_STRING_LENGTH: K_STRING_MAX_LENGTH
+    },
+    File: File,
+    Blob: Blob
 }

lib/vendor/buffer/index.js

@@ -5,5 +5,9 @@ module.exports = {
     Buffer: SpecificBuffer(globalThis.Buffer),
     SlowBuffer: buffer.SlowBuffer,
     INSPECT_MAX_BYTES: buffer.INSPECT_MAX_BYTES,
-    kMaxLength: buffer.kMaxLength
+    kMaxLength: buffer.kMaxLength,
+    kStringMaxLength: buffer.kStringMaxLength,
+    constants: buffer.constants,
+    File: buffer.File,
+    Blob: buffer.Blob,
 }

test/unit/sandbox-libraries/buffer.test.js

@@ -243,8 +243,35 @@ describe('sandbox library - buffer', function () {
                 buffer = require('buffer');
 
             assert.strictEqual(typeof buffer.kMaxLength, 'number');
+            assert.strictEqual(typeof buffer.kStringMaxLength, 'number');
+            assert.strictEqual(typeof buffer.constants.MAX_LENGTH, 'number');
+            assert.strictEqual(typeof buffer.constants.MAX_STRING_LENGTH, 'number');
             assert.strictEqual(typeof buffer.INSPECT_MAX_BYTES, 'number');
 
         `, done);
     });
+
+    it('should expose File class', function (done) {
+        context.execute(`
+            const assert = require('assert'),
+                buffer = require('buffer');
+
+            const lastModified = Date.now();
+            const file = new buffer.File([], 'filename.txt', { type: 'text/plain', lastModified });
+
+            assert.strictEqual(file.name, 'filename.txt');
+            assert.strictEqual(file.lastModified, lastModified);
+        `, done);
+    });
+
+    it('should expose Blob class', function (done) {
+        context.execute(`
+            const assert = require('assert'),
+                buffer = require('buffer');
+
+            const blob = new buffer.Blob(['hello world'], { type: 'text/plain' });
+
+            assert.strictEqual(blob.size, 11);
+        `, done);
+    });
 });