diff --git a/karma.conf.js b/karma.conf.cjs
similarity index 100%
rename from karma.conf.js
rename to karma.conf.cjs
diff --git a/package.json b/package.json
index bfe16a54..2802edf9 100644
--- a/package.json
+++ b/package.json
@@ -1,25 +1,32 @@
 {
   "name": "@novnc/novnc",
-  "version": "1.6.0",
+  "version": "1.6.1-alpha.1",
   "description": "An HTML5 VNC client",
-  "browser": "lib/rfb",
-  "directories": {
-    "lib": "lib",
-    "doc": "docs",
-    "test": "tests"
-  },
+  "type": "module",
   "files": [
-    "lib",
+    "core",
+    "vendor",
     "AUTHORS",
     "VERSION",
     "docs/API.md",
     "docs/LIBRARY.md",
     "docs/LICENSE*"
   ],
+  "exports": {
+    ".": "./core/rfb.js",
+    "./lib/*": "./core/*.js",
+    "./lib/*.js": "./core/*.js",
+    "./core/*": "./core/*.js",
+    "./core/*.js": "./core/*.js",
+    "./lib/vendor/*": "./vendor/*.js",
+    "./lib/vendor/*.js": "./vendor/*.js",
+    "./vendor/*": "./vendor/*.js",
+    "./vendor/*.js": "./vendor/*.js",
+    "./package.json": "./package.json"
+  },
   "scripts": {
     "lint": "eslint app core po/po2js po/xgettext-html tests utils",
-    "test": "karma start karma.conf.js",
-    "prepublish": "node ./utils/convert.js --clean"
+    "test": "karma start karma.conf.cjs"
   },
   "repository": {
     "type": "git",
diff --git a/po/po2js b/po/po2js
index 6347e1ea..38effd30 100755
--- a/po/po2js
+++ b/po/po2js
@@ -17,9 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-const { program } = require('commander');
-const fs = require('fs');
-const pofile = require("pofile");
+import { program } from 'commander';
+import fs from 'fs';
+import pofile from "pofile";
 
 program
     .argument('<input>')
diff --git a/po/xgettext-html b/po/xgettext-html
index f5ba57cc..3fcaacd4 100755
--- a/po/xgettext-html
+++ b/po/xgettext-html
@@ -5,9 +5,9 @@
  * Licensed under MPL 2.0 (see LICENSE.txt)
  */
 
-const { program } = require('commander');
-const jsdom = require("jsdom");
-const fs = require("fs");
+import { program } from 'commander';
+import jsdom from 'jsdom';
+import fs from 'fs';
 
 program
     .argument('<INPUT...>')
@@ -106,7 +106,7 @@ let output = "";
 
 for (let str in strings) {
     output += "#:";
-    for (location in strings[str]) {
+    for (let location in strings[str]) {
         output += " " + location;
     }
     output += "\n";
diff --git a/utils/convert.js b/utils/convert.js
deleted file mode 100755
index 617f4ed6..00000000
--- a/utils/convert.js
+++ /dev/null
@@ -1,140 +0,0 @@
-#!/usr/bin/env node
-
-const path = require('path');
-const { program } = require('commander');
-const fs = require('fs');
-const fse = require('fs-extra');
-const babel = require('@babel/core');
-
-program
-    .option('-m, --with-source-maps [type]', 'output source maps when not generating a bundled app (type may be empty for external source maps, inline for inline source maps, or both) ')
-    .option('--clean', 'clear the lib folder before building')
-    .parse(process.argv);
-
-// the various important paths
-const paths = {
-    main: path.resolve(__dirname, '..'),
-    core: path.resolve(__dirname, '..', 'core'),
-    vendor: path.resolve(__dirname, '..', 'vendor'),
-    libDirBase: path.resolve(__dirname, '..', 'lib'),
-};
-
-// util.promisify requires Node.js 8.x, so we have our own
-function promisify(original) {
-    return function promiseWrap() {
-        const args = Array.prototype.slice.call(arguments);
-        return new Promise((resolve, reject) => {
-            original.apply(this, args.concat((err, value) => {
-                if (err) return reject(err);
-                resolve(value);
-            }));
-        });
-    };
-}
-
-const writeFile = promisify(fs.writeFile);
-
-const readdir = promisify(fs.readdir);
-const lstat = promisify(fs.lstat);
-
-const ensureDir = promisify(fse.ensureDir);
-
-const babelTransformFile = promisify(babel.transformFile);
-
-// walkDir *recursively* walks directories trees,
-// calling the callback for all normal files found.
-function walkDir(basePath, cb, filter) {
-    return readdir(basePath)
-        .then((files) => {
-            const paths = files.map(filename => path.join(basePath, filename));
-            return Promise.all(paths.map(filepath => lstat(filepath)
-                .then((stats) => {
-                    if (filter !== undefined && !filter(filepath, stats)) return;
-
-                    if (stats.isSymbolicLink()) return;
-                    if (stats.isFile()) return cb(filepath);
-                    if (stats.isDirectory()) return walkDir(filepath, cb, filter);
-                })));
-        });
-}
-
-function makeLibFiles(sourceMaps) {
-    // NB: we need to make a copy of babelOpts, since babel sets some defaults on it
-    const babelOpts = () => ({
-        plugins: [],
-        presets: [
-            [ '@babel/preset-env',
-              { modules: 'commonjs' } ]
-        ],
-        ast: false,
-        sourceMaps: sourceMaps,
-    });
-
-    fse.ensureDirSync(paths.libDirBase);
-
-    const outFiles = [];
-
-    const handleDir = (vendorRewrite, inPathBase, filename) => Promise.resolve()
-        .then(() => {
-            const outPath = path.join(paths.libDirBase, path.relative(inPathBase, filename));
-
-            if (path.extname(filename) !== '.js') {
-                return;  // skip non-javascript files
-            }
-            return Promise.resolve()
-                .then(() => ensureDir(path.dirname(outPath)))
-                .then(() => {
-                    const opts = babelOpts();
-            // Adjust for the fact that we move the core files relative
-            // to the vendor directory
-                    if (vendorRewrite) {
-                        opts.plugins.push(["import-redirect",
-                                           {"root": paths.libDirBase,
-                                            "redirect": { "vendor/(.+)": "./vendor/$1"}}]);
-                    }
-
-                    return babelTransformFile(filename, opts)
-                        .then((res) => {
-                            console.log(`Writing ${outPath}`);
-                            const {map} = res;
-                            let {code} = res;
-                            if (sourceMaps === true) {
-                    // append URL for external source map
-                                code += `\n//# sourceMappingURL=${path.basename(outPath)}.map\n`;
-                            }
-                            outFiles.push(`${outPath}`);
-                            return writeFile(outPath, code)
-                                .then(() => {
-                                    if (sourceMaps === true || sourceMaps === 'both') {
-                                        console.log(`  and ${outPath}.map`);
-                                        outFiles.push(`${outPath}.map`);
-                                        return writeFile(`${outPath}.map`, JSON.stringify(map));
-                                    }
-                                });
-                        });
-                });
-        });
-
-    Promise.resolve()
-        .then(() => {
-            const handler = handleDir.bind(null, false, paths.main);
-            return walkDir(paths.vendor, handler);
-        })
-        .then(() => {
-            const handler = handleDir.bind(null, true, paths.core);
-            return walkDir(paths.core, handler);
-        })
-        .catch((err) => {
-            console.error(`Failure converting modules: ${err}`);
-            process.exit(1);
-        });
-}
-
-let options = program.opts();
-
-if (options.clean) {
-    console.log(`Removing ${paths.libDirBase}`);
-    fse.removeSync(paths.libDirBase);
-}
-
-makeLibFiles(options.withSourceMaps);
diff --git a/utils/genkeysymdef.js b/utils/genkeysymdef.cjs
similarity index 100%
rename from utils/genkeysymdef.js
rename to utils/genkeysymdef.cjs