Remove useless iterator library

src/polyfill.ts

@@ -0,0 +1,59 @@
+// es-iterator-helpers/Iterator.prototype.filter
+export function* filter<T>(
+  iterable: Iterable<T>,
+  predicate: (value: T) => boolean,
+): Iterable<T> {
+  for (const value of iterable) {
+    if (predicate(value)) {
+      yield value;
+    }
+  }
+}
+
+// es-iterator-helpers/Iterator.prototype.forEach
+export function forEach<T>(iterable: Iterable<T>, callback: (value: T) => void) {
+  for (const value of iterable) {
+    callback(value);
+  }
+}
+
+// es-iterator-helpers/Iterator.prototype.some
+export function some<T>(
+  iterable: Iterable<T>,
+  predicate: (value: T) => boolean,
+): boolean {
+  for (const value of iterable) {
+    if (predicate(value)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+// es-iterator-helpers/Iterator.prototype.find
+export function find<T>(
+  iterable: Iterable<T>,
+  predicate: (value: T) => boolean,
+): T | undefined {
+  for (const value of iterable) {
+    if (predicate(value)) {
+      return value;
+    }
+  }
+}
+
+// es-iterator-helpers/Iterator.from
+export function from<T>(iterable: Iterable<T>) {
+  return iterable;
+}
+
+// es-iterator-helpers/Iterator.prototype.map
+export function* map<T, U>(
+  iterable: Iterable<T>,
+  callback: (value: T) => U,
+): Iterable<U> {
+  for (const value of iterable) {
+    yield callback(value);
+  }
+}