diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..0709f7b
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,128 @@
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+
+# IntelliJ
+out/
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+ Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+dist/examples/*
+dist/src/*
+dist/test/*
+
+.idea/*.*
diff --git a/examples/heatmap.html b/examples/heatmap.html
index efe7953..281cc2e 100644
--- a/examples/heatmap.html
+++ b/examples/heatmap.html
@@ -13,7 +13,8 @@
         <div id="heatmap"></div>
         <button id="cluster">Cluster!</button>
 
-        <script>
+        <script type="module">
+
             d3.csv('data/dendrogram.csv')
                 .then(function(data) {
 
@@ -46,7 +47,6 @@
                         let rowValues = [];
 
                         for (let col of cols) {
-                            // @ts-ignore
                             let val = parseFloat(row[col.name]);
                             rowValues.push({
                                 value: val
diff --git a/package.json b/package.json
index 1b8b4d5..e1fbd63 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "unipept-heatmap",
-  "version": "1.0.10",
+  "version": "1.0.11",
   "description": "HeatMap built for the Unipept project. See http://unipept.ugent.be for more information. This HeatMap supports UPGMA-clustering and MOLO-reordering.",
   "main": "dist/bundle.js",
   "typings": "dist/index.d.ts",
diff --git a/src/heatmap/heatmap.ts b/src/heatmap/heatmap.ts
index b065f72..01a341a 100644
--- a/src/heatmap/heatmap.ts
+++ b/src/heatmap/heatmap.ts
@@ -8,7 +8,7 @@ import {HeatmapData, HeatmapElement, HeatmapValue} from "./input";
 import Reorderer from "../reorder/reorderer";
 import MoloReorderer from "../reorder/moloReorderer";
 
-export class Heatmap {
+class Heatmap {
     private element: HTMLElement;
     private settings: HeatmapSettings;