Parts of this document are for more advanced user cases and you probably won't ever need to use them.

Keymaps allow users to use shortcuts to manipulate the text in their editor. Cmd-b is an example for setting the selected text to be bold.

In a sufficiently large

The following is an example where the enter key can be customised to ignore all lower priority Enter key bindings.

The next method allows full control beyond the return value. It allows both calling all lower priority key bindings regardless of whether true or false has been called.

import { BaseExtensionOptions, Extension, extensionDecorator, KeyBindings } from '@remirror/core';
interface CustomKeymapExtensionOptions {
override?: boolean;
@extensionDecorator({ defaultOptions: { override: false } })
export class CustomKeymapExtension extends Extension<CustomKeymapExtensionOptions> {
get name() {
return 'customKeymap' as const;
* Injects the baseKeymap into the editor.
public createKeymap(): KeyBindings {
const { override } = this.options;
return {
Enter({ next }) {
if (override) {
// No other commands will be run
return true;
next(); // Runs all lower priority commands
return true;


To use the above example you could do the following.

import { RemirrorManager } from '@remirror/core';
import { baseExtensions } from '@remirror/core-extensions';
import { CustomKeymapExtension } from './custom-keymap-extension';
const manager = RemirrorManager.create([new CustomKeymapExtension({ override: true })]);

This manager can now be used to create an editor where the baseKeymap for the Enter key is overridden.

If override is set to false, the keybinding will defer to lower priority keybindings while still allowing the behaviour you want for the extension.