WIP - add extractor, generate snippet_data

node_modules/fbjs/lib/CircularBuffer.js.flow

@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @providesModule CircularBuffer
+ */
+var invariant = require("./invariant");
+
+class CircularBuffer {
+  constructor(size) {
+    invariant(size > 0, 'Buffer size should be a positive integer');
+    this._size = size;
+    this._head = 0;
+    this._buffer = [];
+  }
+
+  write(entry) {
+    if (this._buffer.length < this._size) {
+      this._buffer.push(entry);
+    } else {
+      this._buffer[this._head] = entry;
+      this._head++;
+      this._head %= this._size;
+    }
+
+    return this;
+  }
+
+  read() {
+    return this._buffer.slice(this._head).concat(this._buffer.slice(0, this._head));
+  }
+
+  clear() {
+    this._head = 0;
+    this._buffer = [];
+    return this;
+  }
+
+}
+
+module.exports = CircularBuffer;