fix: Revert moving createIcons to separate file

packages/lucide/src/lucide.ts

@@ -1,9 +1,41 @@
+import replaceElement from './replaceElement';
 import * as iconAndAliases from './iconsAndAliases';
 
-/*
-  Create Icons function export.
-*/
-export { default as createIcons } from './createIcons';
+/**
+ * Replaces all elements with matching nameAttr with the defined icons
+ * @param {{ icons?: object, nameAttr?: string, attrs?: object }} options
+ */
+const createIcons = ({ icons = {}, nameAttr = 'data-lucide', attrs = {} } = {}) => {
+  if (!Object.values(icons).length) {
+    throw new Error(
+      "Please provide an icons object.\nIf you want to use all the icons you can import it like:\n `import { createIcons, icons } from 'lucide';\nlucide.createIcons({icons});`",
+    );
+  }
+
+  if (typeof document === 'undefined') {
+    throw new Error('`createIcons()` only works in a browser environment.');
+  }
+
+  const elementsToReplace = document.querySelectorAll(`[${nameAttr}]`);
+  Array.from(elementsToReplace).forEach((element) =>
+    replaceElement(element, { nameAttr, icons, attrs }),
+  );
+
+  /** @todo: remove this block in v1.0 */
+  if (nameAttr === 'data-lucide') {
+    const deprecatedElements = document.querySelectorAll('[icon-name]');
+    if (deprecatedElements.length > 0) {
+      console.warn(
+        '[Lucide] Some icons were found with the now deprecated icon-name attribute. These will still be replaced for backwards compatibility, but will no longer be supported in v1.0 and you should switch to data-lucide',
+      );
+      Array.from(deprecatedElements).forEach((element) =>
+        replaceElement(element, { nameAttr: 'icon-name', icons, attrs }),
+      );
+    }
+  }
+};
+
+export { createIcons };
 
 /*
   Create Element function export.