1 files changed, 97 insertions, 0 deletions
diff --git a/src/bun.js/node/buffer.js b/src/bun.js/node/buffer.js
new file mode 100644
index 000000000..faee19655
--- /dev/null
+++ b/src/bun.js/node/buffer.js
@@ -0,0 +1,97 @@
+"use strict";
+
+function createBuffer(BufferPrototype, BufferStatic, Realm) {
+  "use strict";
+
+  var Uint8ArraySubarray = Realm.Uint8Array.prototype.subarray;
+  var isUint8Array = (value) => value instanceof Realm.Uint8Array;
+  var SymbolToPrimitive = Realm.Symbol.toPrimitive;
+  var isArray = Realm.Array.isArray;
+  var isArrayBufferLike =
+    "SharedArrayBuffer" in Realm
+      ? () =>
+          value instanceof Realm.ArrayBuffer ||
+          value instanceof Realm.SharedArrayBuffer
+      : () => value instanceof Realm.ArrayBuffer;
+
+  var BufferInstance = class BufferInstance extends Realm.Uint8Array {
+    constructor(bufferOrLength, byteOffset, length) {
+      super(bufferOrLength, byteOffset, length);
+    }
+
+    static isBuffer(obj) {
+      return obj instanceof BufferInstance;
+    }
+
+    static from(value, encodingOrOffset, length) {
+      switch (typeof value) {
+        case "string": {
+          return BufferStatic.fromString(value, encodingOrOffset, length);
+        }
+        case "object": {
+          if (isUint8Array(value)) {
+            return BufferStatic.fromUint8Array(value, encodingOrOffset, length);
+          }
+
+          if (isArrayBufferLike(value)) {
+            return new BufferInstance(value, 0, length);
+          }
+
+          const valueOf = value.valueOf && value.valueOf();
+          if (
+            valueOf != null &&
+            valueOf !== value &&
+            (typeof valueOf === "string" || typeof valueOf === "object")
+          ) {
+            return BufferInstance.from(valueOf, encodingOrOffset, length);
+          }
+
+          if (typeof value[SymbolToPrimitive] === "function") {
+            const primitive = value[SymbolToPrimitive]("string");
+            if (typeof primitive === "string") {
+              return BufferStatic.fromString(primitive, encodingOrOffset);
+            }
+          }
+
+          if (isArray(value)) {
+            return BufferStatic.fromArray(value, encodingOrOffset, length);
+          }
+        }
+      }
+
+      throw new TypeError(
+        "First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object."
+      );
+    }
+
+    slice(start, end) {
+      return Uint8ArraySubarray.call(this, start, end);
+    }
+
+    static get poolSize() {
+      return BufferStatic._poolSize;
+    }
+
+    static set poolSize(value) {
+      BufferStatic._poolSize = value;
+    }
+
+    get parent() {
+      return this.buffer;
+    }
+
+    get offset() {
+      return this.byteOffset;
+    }
+  };
+
+  Object.assign(BufferInstance, BufferStatic);
+  Object.assign(BufferInstance.prototype, BufferPrototype);
+  Object.defineProperty(BufferInstance, "name", {
+    value: "Buffer",
+    configurable: false,
+    enumerable: false,
+  });
+
+  return BufferInstance;
+}