Cannot read properties of undefined (reading 'bold')

[nodesocket]

Running latest 2.0.6. Trying to use custom toolbar buttons and now seeing:

Uncaught TypeError: Cannot read properties of undefined (reading 'bold')

...
    toolbar: true,
    toolbarButtons: [
        toolbarButtons.bold,
        toolbarButtons.italic,
        toolbarButtons.code,
        toolbarButtons.separator,
        toolbarButtons.link,
        toolbarButtons.separator,
        toolbarButtons.h1,
        toolbarButtons.h2,
        toolbarButtons.h3,
        toolbarButtons.separator,
        toolbarButtons.bulletList,
        toolbarButtons.separator,
        toolbarButtons.quote,
        toolbarButtons.separator,
        toolbarButtons.viewMode,
    ]
...