diff --git a/x-pack/plugins/canvas/public/components/arg_form/arg_form.js b/x-pack/plugins/canvas/public/components/arg_form/arg_form.js
index 0f22307c9cd1..1e79b8152c9d 100644
--- a/x-pack/plugins/canvas/public/components/arg_form/arg_form.js
+++ b/x-pack/plugins/canvas/public/components/arg_form/arg_form.js
@@ -75,7 +75,6 @@ export const ArgForm = (props) => {
             Promise.resolve().then(() => {
               // Provide templates with a renderError method, and wrap the error in a known error type
               // to stop Kibana's window.error from being called
-              // see window_error_handler.js for details,
               isMounted.current && setRenderError(true);
             });
           },
diff --git a/x-pack/plugins/canvas/public/lib/window_error_handler.js b/x-pack/plugins/canvas/public/lib/window_error_handler.js
deleted file mode 100644
index 0d24a9898612..000000000000
--- a/x-pack/plugins/canvas/public/lib/window_error_handler.js
+++ /dev/null
@@ -1,88 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import * as knownErrors from '../../common/lib/errors';
-
-const oldHandler = window.onerror;
-
-function showError(err) {
-  const body = document.querySelector('body');
-  const notice = document.createElement('div');
-  notice.classList.add('window-error');
-
-  const close = document.createElement('a');
-  close.textContent = 'close';
-  close.onclick = (ev) => {
-    ev.preventDefault();
-    body.removeChild(notice);
-  };
-  notice.appendChild(close);
-
-  notice.insertAdjacentHTML('beforeend', '<h3>Uncaught error swallowed in dev mode</h3>');
-
-  const message = document.createElement('p');
-  message.textContent = `Error: ${err.message}`;
-  notice.appendChild(message);
-
-  if (err.stack) {
-    const stack = document.createElement('pre');
-    stack.textContent = err.stack.split('\n').slice(0, 2).concat('...').join('\n');
-    notice.appendChild(stack);
-  }
-
-  notice.insertAdjacentHTML('beforeend', `<p>Check console for more information</p>`);
-  body.appendChild(notice);
-}
-
-window.canvasInitErrorHandler = () => {
-  // React will delegate to window.onerror, even when errors are caught with componentWillCatch,
-  // so check for a known custom error type and skip the default error handling when we find one
-  window.onerror = (...args) => {
-    const [message, , , , err] = args;
-
-    // ResizeObserver error does not have an `err` object
-    // It is thrown during workpad loading due to layout thrashing
-    // https://stackoverflow.com/questions/49384120/resizeobserver-loop-limit-exceeded
-    // https://github.com/elastic/eui/issues/3346
-    console.log(message);
-    const isKnownError =
-      message.includes('ResizeObserver loop') ||
-      Object.keys(knownErrors).find((errorName) => {
-        return err.constructor.name === errorName || message.indexOf(errorName) >= 0;
-      });
-    if (isKnownError) {
-      return;
-    }
-
-    // uncaught errors are silenced in dev mode
-    // NOTE: react provides no way I can tell to distingish that an error came from react, it just
-    // throws generic Errors. In development mode, it throws those errors even if you catch them in
-    // an error boundary. This uses in the stack trace to try to detect it, but that stack changes
-    // between development and production modes. Fortunately, beginWork exists in both, so it uses
-    // a mix of the runtime mode and checking for another react method (renderRoot) for development
-    // TODO: this is *super* fragile. If the React method names ever change, which seems kind of likely,
-    // this check will break.
-    const isProduction = process.env.NODE_ENV === 'production';
-    if (!isProduction) {
-      // TODO: we should do something here to let the user know something failed,
-      // but we don't currently have an error logging service
-      console.error(err);
-      console.warn(`*** Uncaught error swallowed in dev mode ***
-
-  Check and fix the above error. This will blow up Kibana when run in production mode!`);
-      showError(err);
-      return;
-    }
-
-    // fall back to the default kibana uncaught error handler
-    oldHandler(...args);
-  };
-};
-
-window.canvasRestoreErrorHandler = () => {
-  window.onerror = oldHandler;
-};