How to style monaco editor context menu

Question

I need to change the css style of the default context menu but I couldn't inspect the classes because it's closed when it out of focus, so if any one knows the classes or know how to adjust the style using javascript can help.

Answer 1

I had similar issue, where I needed to replace the icons that appear in the completion menu.

From the Network tab of the browser, I opened the file editor.main.css.

There, you can see the css selectors, and the embedded svg-xml for the icons.

For example, to replace the icons used for 'methods' or 'functions' in the completion menu, add this to your html (after the Monaco stylesheet is loaded)

.monaco-editor .suggest-widget .monaco-list .monaco-list-row .suggest-icon.method::before,
.monaco-editor .suggest-widget .monaco-list .monaco-list-row .suggest-icon.function::before
/* copied from lightbulb */
{ background-image: url(data:image/svg+xml;base64,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) !important; }

Answer 2

There is actually a way to overwrite the stylesheet of the context menu, because the Shadow DOM is still in mode open.

Here is a little code snippet that might help you.

function injectMonacoContextMenuStyle(editorElement) {
  const host = editorElement.querySelector(".shadow-root-host");

  // adds the custom stylesheet once per editor
  if (host && host.shadowRoot && !host.shadowRoot.querySelector(".custom")) 
  {
    const style = document.createElement("style");

    style.setAttribute("class", "custom");
    style.innerHTML = `
      .context-view.monaco-menu-container > .monaco-scrollable-element {
        border-radius: 8px;
      }
    `;
    host.shadowRoot.prepend(style);
  }
}
 
const editor = Editor.create(element, config);
    
editor.onContextMenu(() => injectMonacoContextMenuStyle(element));