change project structure to remove namespaces

src/bitarray/index.ts

@@ -0,0 +1,29 @@
+import { asArray } from "../utils.js";
+import { EmptyBitArray, BitArrayImpl } from "./impl.js";
+import { BitArray } from "./types.js";
+
+const emptyBitArray = new EmptyBitArray();
+export const EMPTY = emptyBitArray;
+
+export function create(length: number): BitArray {
+  if (length < 0) {
+    throw new Error("length < 0");
+  }
+
+  return length === 0 ? EMPTY : new BitArrayImpl(length);
+}
+
+export function from(bits: Iterable<boolean>): BitArray {
+  const arr = asArray(bits);
+  const result = create(arr.length);
+
+  for (let i = 0; i < arr.length; i++) {
+    result.set(i, arr[i]);
+  }
+
+  return result;
+}
+
+export function of(...bits: boolean[]): BitArray {
+  return from(bits);
+}