diff --git a/LICENSE.note b/LICENSE.note
new file mode 100644
index 0000000..92f1836
--- /dev/null
+++ b/LICENSE.note
@@ -0,0 +1,8 @@
+The rtabulator package as a whole is distributed under MIT.
+The rtabulator package includes other open source software components.
+The following is a list of these components:
+
+* tabulator.js: MIT
+* rtabulator.js: written by package authors
+
+Full copies of the license agreements used by these components are included in `inst/htmlwidgets/libs`.
diff --git a/NAMESPACE b/NAMESPACE
index bd0c0b0..98b88bf 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -1,7 +1,6 @@
 # Generated by roxygen2: do not edit by hand
 
 export(add_row)
-export(create_columns)
 export(delete_selected_rows)
 export(for_each_col)
 export(redo)
diff --git a/R/columns.R b/R/columns.R
index 429467d..458a474 100644
--- a/R/columns.R
+++ b/R/columns.R
@@ -1,8 +1,8 @@
-#' Create column definitions from data
-#' @param data (data.frame) data
-#' @param editor (bool): Whether to make columns editable.
-#' @param filter (bool): Whether to add a header filter to the columns.
-#' @export
+# #' Create column definitions from data
+# #' @param data (data.frame) data
+# #' @param editor (bool): Whether to make columns editable.
+# #' @param filter (bool): Whether to add a header filter to the columns.
+# #' @returns list
 # TODO: We do not need to export this func anymore
 create_columns <- function(data, editor = FALSE, filter = FALSE) {
   data <- fix_colnames(data)
@@ -87,6 +87,7 @@ for_each_col <- function(widget, columns = NULL, .f, ...) {
 }
 
 # Formatters ####
+# TODO: Move formatters to separate file
 
 #' Set HTML formatter
 #' @param widget (\code{\link{tabulator}}) A tabulator widget.
diff --git a/R/spreadsheet.R b/R/spreadsheet.R
index 0f73ce4..b112e4f 100644
--- a/R/spreadsheet.R
+++ b/R/spreadsheet.R
@@ -4,6 +4,7 @@
 #' @param data (list): The initial data of the spreadsheet.
 #'  Set to \code{NULL} to create an empty spreadsheet.
 #' @returns list
+#' @example examples/multiple_spreadsheets.R
 #' @export
 spreadsheet_def <- function(title, key = NULL, data = NULL) {
   return(compact(as.list(environment())))
diff --git a/_pkgdown.yml b/_pkgdown.yml
index b11a6ff..154732b 100644
--- a/_pkgdown.yml
+++ b/_pkgdown.yml
@@ -50,7 +50,6 @@ reference:
       Utitily functions
     contents:
       - spreadsheet_def
-      - create_columns
 
   - title: Data Sets
     contents:
diff --git a/examples/multiple_spreadsheets.R b/examples/multiple_spreadsheets.R
index 109ed3d..e2e2733 100644
--- a/examples/multiple_spreadsheets.R
+++ b/examples/multiple_spreadsheets.R
@@ -1,11 +1,11 @@
 setup <- tabulator_options(
   spreadsheet = TRUE,
   spreadsheet_sheets = list(
-    list(
+    spreadsheet_def(
       title = "First",
       data = list(c(1, 2, 3))
     ),
-    list(
+    spreadsheet_def(
       title = "Second",
       data = list(c(4, 5, 6))
     )
diff --git a/inst/htmlwidgets/rtabulator.js b/inst/htmlwidgets/rtabulator.js
index 25827a7..87904ce 100644
--- a/inst/htmlwidgets/rtabulator.js
+++ b/inst/htmlwidgets/rtabulator.js
@@ -1,136 +1 @@
-(() => {
-  // src/utils.js
-  function convertToDataFrame(data) {
-    res = {};
-    if (data.length === 0) {
-      return res;
-    }
-    keys = Object.keys(data[0]);
-    keys.forEach((key) => res[key] = data.map((item) => item[key]));
-    return res;
-  }
-
-  // src/events.js
-  function addEventListeners(table, el) {
-    table.on("rowClick", function(e, row) {
-      const inputName = `${el.id}_row_clicked`;
-      console.log(inputName, row.getData());
-      Shiny.onInputChange(inputName, row.getData());
-    });
-    table.on("rowClick", (e, row) => {
-      const inputName = `${el.id}_rows_selected:rtabulator.data`;
-      const data = table.getSelectedRows().map((row2) => row2.getData());
-      console.log(inputName, data);
-      Shiny.onInputChange(inputName, { data: convertToDataFrame(data) });
-    });
-    table.on("cellEdited", function(cell) {
-      const inputName = `${el.id}_cell_edited`;
-      console.log(inputName, cell.getData());
-      Shiny.onInputChange(inputName, cell.getData());
-    });
-    table.on("dataFiltered", function(filters, rows) {
-      const inputName = `${el.id}_data_filtered:rtabulator.data`;
-      const data = rows.map((row) => row.getData());
-      console.log(inputName, data);
-      Shiny.onInputChange(inputName, { data: convertToDataFrame(data) });
-    });
-  }
-
-  // src/widget.js
-  function run_calls(el, table, calls) {
-    calls.forEach(([method_name, options]) => {
-      if (method_name === "getData") {
-        const inputName = `${el.id}_get_data:rtabulator.data`;
-        console.log("custom call", inputName);
-        Shiny.setInputValue(
-          inputName,
-          { data: convertToDataFrame(table.getData()) },
-          { priority: "event" }
-        );
-        return;
-      }
-      if (method_name === "deleteSelectedRows") {
-        console.log("custom call");
-        const rows = table.getSelectedRows();
-        rows.forEach((row) => {
-          console.log(row.getIndex());
-          table.deleteRow(row.getIndex());
-        });
-        return;
-      }
-      if (method_name === "getSheetData") {
-        const inputName = `${el.id}_get_sheet_data:rtabulator.sheet_data`;
-        console.log("custom call", inputName);
-        Shiny.setInputValue(
-          inputName,
-          { data: table.getSheetData() },
-          { priority: "event" }
-        );
-        return;
-      }
-      console.log(method_name, options);
-      table[method_name](...options);
-    });
-  }
-  var TabulatorWidget = class {
-    constructor(container, data, options) {
-      options.data = data;
-      this._container = container;
-      console.log("columns", options.columns);
-      if (data !== null && options.columns == null) {
-        options.autoColumns = true;
-      }
-      if (options.spreadsheet && options.spreadsheetData == null) {
-        options.spreadsheetData = [];
-      }
-      this._table = new Tabulator(this._container, options);
-      if (typeof Shiny === "object") {
-        addEventListeners(this._table, this._container);
-        this._addShinyMessageHandler();
-      }
-    }
-    _addShinyMessageHandler() {
-      const messageHandlerName = `tabulator-${this._container.id}`;
-      Shiny.addCustomMessageHandler(messageHandlerName, (payload) => {
-        console.log(payload);
-        run_calls(this._container, this._table, payload.calls);
-      });
-    }
-    getTable() {
-      return this._table;
-    }
-  };
-
-  // src/index-r.js
-  function tabulatorFactory(widgetElement, width, height) {
-    let table = null;
-    function renderValue(payload) {
-      console.log(payload);
-      if (payload.stylesheetText) {
-        document.head.insertAdjacentHTML(
-          "beforeend",
-          `<style>${payload.stylesheetText}</style>`
-        );
-      }
-      if (payload.options === null) {
-        payload.options = {};
-      }
-      let data = null;
-      if (payload.options.spreadsheet === true) {
-        payload.options.spreadsheetData = payload.data;
-      } else {
-        data = HTMLWidgets.dataframeToD3(payload.data);
-      }
-      const widget = new TabulatorWidget(widgetElement, data, payload.options);
-      table = widget.getTable();
-    }
-    function resize(width2, height2) {
-    }
-    return { renderValue, resize };
-  }
-  HTMLWidgets.widget({
-    name: "rtabulator",
-    type: "output",
-    factory: tabulatorFactory
-  });
-})();
+(()=>{function i(o){return res={},o.length===0||(keys=Object.keys(o[0]),keys.forEach(e=>res[e]=o.map(a=>a[e]))),res}function d(o,e){o.on("rowClick",function(a,t){let r=`${e.id}_row_clicked`;console.log(r,t.getData()),Shiny.onInputChange(r,t.getData())}),o.on("rowClick",(a,t)=>{let r=`${e.id}_rows_selected:rtabulator.data`,s=o.getSelectedRows().map(n=>n.getData());console.log(r,s),Shiny.onInputChange(r,{data:i(s)})}),o.on("cellEdited",function(a){let t=`${e.id}_cell_edited`;console.log(t,a.getData()),Shiny.onInputChange(t,a.getData())}),o.on("dataFiltered",function(a,t){let r=`${e.id}_data_filtered:rtabulator.data`,s=t.map(n=>n.getData());console.log(r,s),Shiny.onInputChange(r,{data:i(s)})})}function u(o,e,a){a.forEach(([t,r])=>{if(t==="getData"){let s=`${o.id}_get_data:rtabulator.data`;console.log("custom call",s),Shiny.setInputValue(s,{data:i(e.getData())},{priority:"event"});return}if(t==="deleteSelectedRows"){console.log("custom call"),e.getSelectedRows().forEach(n=>{console.log(n.getIndex()),e.deleteRow(n.getIndex())});return}if(t==="getSheetData"){let s=`${o.id}_get_sheet_data:rtabulator.sheet_data`;console.log("custom call",s),Shiny.setInputValue(s,{data:e.getSheetData()},{priority:"event"});return}console.log(t,r),e[t](...r)})}var c=class{constructor(e,a,t){t.data=a,this._container=e,console.log("columns",t.columns),a!==null&&t.columns==null&&(t.autoColumns=!0),t.spreadsheet&&t.spreadsheetData==null&&(t.spreadsheetData=[]),this._table=new Tabulator(this._container,t),typeof Shiny=="object"&&(d(this._table,this._container),this._addShinyMessageHandler())}_addShinyMessageHandler(){let e=`tabulator-${this._container.id}`;Shiny.addCustomMessageHandler(e,a=>{console.log(a),u(this._container,this._table,a.calls)})}getTable(){return this._table}};function g(o,e,a){let t=null;function r(n){console.log(n),n.stylesheetText&&document.head.insertAdjacentHTML("beforeend",`<style>${n.stylesheetText}</style>`),n.options===null&&(n.options={});let l=null;n.options.spreadsheet===!0?n.options.spreadsheetData=n.data:l=HTMLWidgets.dataframeToD3(n.data),t=new c(o,l,n.options).getTable()}function s(n,l){}return{renderValue:r,resize:s}}HTMLWidgets.widget({name:"rtabulator",type:"output",factory:g});})();
diff --git a/man/create_columns.Rd b/man/create_columns.Rd
deleted file mode 100644
index 392a5f3..0000000
--- a/man/create_columns.Rd
+++ /dev/null
@@ -1,18 +0,0 @@
-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/columns.R
-\name{create_columns}
-\alias{create_columns}
-\title{Create column definitions from data}
-\usage{
-create_columns(data, editor = FALSE, filter = FALSE)
-}
-\arguments{
-\item{data}{(data.frame) data}
-
-\item{editor}{(bool): Whether to make columns editable.}
-
-\item{filter}{(bool): Whether to add a header filter to the columns.}
-}
-\description{
-Create column definitions from data
-}
diff --git a/man/spreadsheet_def.Rd b/man/spreadsheet_def.Rd
index a928c0f..e8e9772 100644
--- a/man/spreadsheet_def.Rd
+++ b/man/spreadsheet_def.Rd
@@ -20,3 +20,21 @@ list
 \description{
 Create a spreadsheet definition
 }
+\examples{
+setup <- tabulator_options(
+  spreadsheet = TRUE,
+  spreadsheet_sheets = list(
+    spreadsheet_def(
+      title = "First",
+      data = list(c(1, 2, 3))
+    ),
+    spreadsheet_def(
+      title = "Second",
+      data = list(c(4, 5, 6))
+    )
+  ),
+  spreadsheet_sheet_tabs = TRUE
+)
+
+tabulator(data = NULL, setup, theme = "midnight")
+}
diff --git a/man/tabulator.Rd b/man/tabulator.Rd
index 16faa85..b94b550 100644
--- a/man/tabulator.Rd
+++ b/man/tabulator.Rd
@@ -59,11 +59,11 @@ Dots in column names are replaced by underscores.
 setup <- tabulator_options(
   spreadsheet = TRUE,
   spreadsheet_sheets = list(
-    list(
+    spreadsheet_def(
       title = "First",
       data = list(c(1, 2, 3))
     ),
-    list(
+    spreadsheet_def(
       title = "Second",
       data = list(c(4, 5, 6))
     )