diff --git a/examples/react/src/index.tsx b/examples/react/src/index.tsx
index b6b8e16e2a..5b983234db 100644
--- a/examples/react/src/index.tsx
+++ b/examples/react/src/index.tsx
@@ -15,7 +15,7 @@ import "@finos/perspective-viewer";
 import "@finos/perspective-viewer-datagrid";
 import "@finos/perspective-viewer-d3fc";
 import {
-    HTMLPerspectiveViewerConfig,
+    PerspectiveViewerConfig,
     HTMLPerspectiveViewerElement,
 } from "@finos/perspective-viewer";
 
@@ -30,7 +30,7 @@ const getTable = async (): Promise<perspective.Table> => {
     return await worker.table(buffer as any);
 };
 
-const config: HTMLPerspectiveViewerConfig = {
+const config: PerspectiveViewerConfig = {
     row_pivots: ["State"],
 };
 
diff --git a/packages/perspective-webpack-plugin/index.js b/packages/perspective-webpack-plugin/index.js
index 2330e47839..449b951377 100644
--- a/packages/perspective-webpack-plugin/index.js
+++ b/packages/perspective-webpack-plugin/index.js
@@ -68,22 +68,6 @@ class PerspectiveWebpackPlugin {
         if (this.options.inline || this.options.inlineWorker) {
             rules[rules.length - 2].use.options.inline = "no-fallback";
             rules[rules.length - 1].use.options.inline = "no-fallback";
-        } else {
-            rules.push({
-                test: /\.js$/,
-                include: path.dirname(
-                    require.resolve("@finos/perspective-viewer/package.json")
-                ),
-                use: [
-                    {
-                        loader: require.resolve("string-replace-loader"),
-                        options: {
-                            search: /webpackMode:\s*?"eager"/g,
-                            replace: "",
-                        },
-                    },
-                ],
-            });
         }
 
         if (!(this.options.inline || this.options.inlineWasm)) {
diff --git a/packages/perspective/src/js/perspective.node.js b/packages/perspective/src/js/perspective.node.js
index a87ead46e1..710fbb1940 100644
--- a/packages/perspective/src/js/perspective.node.js
+++ b/packages/perspective/src/js/perspective.node.js
@@ -219,6 +219,7 @@ const websocket = (url) => {
 module.exports.get_type_config = get_type_config;
 module.exports.get_config = get_config;
 module.exports.worker = () => module.exports;
+module.exports.shared_worker = () => module.exports;
 module.exports.websocket = websocket;
 module.exports.perspective_assets = perspective_assets;
 module.exports.WebSocketServer = WebSocketServer;
diff --git a/rust/perspective-viewer/build.js b/rust/perspective-viewer/build.js
index 1ff97035b3..93ee2d2e82 100644
--- a/rust/perspective-viewer/build.js
+++ b/rust/perspective-viewer/build.js
@@ -1,5 +1,7 @@
 const {lessLoader} = require("esbuild-plugin-less");
 const {execSync} = require("child_process");
+const util = require("util");
+const exec = util.promisify(require("child_process").exec);
 const fs = require("fs");
 
 const {IgnoreCSSPlugin} = require("@finos/perspective-build/ignore_css");
@@ -10,6 +12,18 @@ const {NodeModulesExternal} = require("@finos/perspective-build/external");
 const {ReplacePlugin} = require("@finos/perspective-build/replace");
 const {build} = require("@finos/perspective-build/build");
 
+function _compile(fileNames) {
+    const ts = require("typescript");
+    const path = require.resolve("@finos/perspective-viewer/tsconfig.json");
+    const {compilerOptions} = JSON.parse(fs.readFileSync(path).toString());
+    const {options} = ts.convertCompilerOptionsFromJson(compilerOptions, "");
+    const host = ts.createCompilerHost(options);
+    fs.mkdirSync("dist/esm", {recursive: true});
+    host.writeFile = (path, contents) => fs.writeFileSync(path, contents);
+    const program = ts.createProgram(fileNames, options, host);
+    program.emit();
+}
+
 const PREBUILD = [
     {
         entryPoints: [
@@ -93,6 +107,12 @@ const POSTBUILD = [
 ];
 
 async function build_all() {
+    // generate declaration in parallel because tsc is sloooow.
+    let tsc;
+    if (fs.existsSync("dist/pkg/perspective_viewer.js")) {
+        tsc = exec("yarn tsc --emitDeclarationOnly --outDir dist/esm");
+    }
+
     await Promise.all(PREBUILD.map(build)).catch(() => process.exit(1));
 
     const debug = process.env.PSP_DEBUG ? "--debug" : "";
@@ -104,11 +124,18 @@ async function build_all() {
         }
     );
 
+    if (typeof tsc === "undefined") {
+        tsc = exec("yarn tsc --emitDeclarationOnly --outDir dist/esm");
+    }
+
     await Promise.all(BUILD.map(build)).catch(() => process.exit(1));
     await Promise.all(POSTBUILD.map(build)).catch(() => process.exit(1));
 
     // legacy compat
     execSync("cpy dist/css/* dist/umd");
+
+    const {stdout} = await tsc;
+    console.log(stdout);
 }
 
 build_all();
diff --git a/rust/perspective-viewer/package.json b/rust/perspective-viewer/package.json
index 9aaeee503b..20511dbaa6 100644
--- a/rust/perspective-viewer/package.json
+++ b/rust/perspective-viewer/package.json
@@ -20,13 +20,14 @@
         "./umd/": "./dist/umd/",
         "./pkg/": "./dist/pkg/",
         "./src/": "./src/",
-        "./package.json": "./package.json"
+        "./package.json": "./package.json",
+        "./tsconfig.json": "./tsconfig.json"
     },
     "files": [
         "dist/**/*",
         "src/**/*"
     ],
-    "types": "dist/esm/index.d.ts",
+    "types": "dist/esm/perspective-viewer.d.ts",
     "scripts": {
         "build": "node ./build.js",
         "clean": "rimraf dist && rimraf pkg && rimraf build",
diff --git a/rust/perspective-viewer/src/rust/js/monaco.rs b/rust/perspective-viewer/src/rust/js/monaco.rs
index 74fc139138..19e01d7252 100644
--- a/rust/perspective-viewer/src/rust/js/monaco.rs
+++ b/rust/perspective-viewer/src/rust/js/monaco.rs
@@ -23,11 +23,15 @@ pub enum KeyCode {
 
 #[cfg_attr(
     not(test),
-    wasm_bindgen(module = "monaco-editor/esm/vs/editor/editor.worker.js")
+    wasm_bindgen(inline_js = "
+    import monaco from 'monaco-editor/esm/vs/editor/editor.worker.js';
+    export default async function () {
+        return await monaco();
+    }
+")
 )]
 #[cfg_attr(test, wasm_bindgen(inline_js = "export default async function() {}"))]
 extern "C" {
-
     #[wasm_bindgen(js_name = "default")]
     pub async fn new_worker() -> JsValue;
 }
@@ -36,9 +40,8 @@ extern "C" {
     not(test),
     wasm_bindgen(inline_js = "
     export async function monaco_module() {
-        return import(
+        return await import(
             /* webpackChunkName: \"monaco\" */
-            /* webpackMode: \"eager\" */
             'monaco-editor/esm/vs/editor/edcore.main.js'
         ); 
     }
diff --git a/rust/perspective-viewer/tsconfig.json b/rust/perspective-viewer/tsconfig.json
index c384857ffb..1a871fec16 100644
--- a/rust/perspective-viewer/tsconfig.json
+++ b/rust/perspective-viewer/tsconfig.json
@@ -3,6 +3,7 @@
         "module": "esnext",
         "target": "es2018",
         "declaration": true,
+        "emitDeclarationOnly": true,
         "outDir": "dist/esm",
         "rootDir": "src/ts",
         "allowSyntheticDefaultImports": true,