plane/apps/app/components/rich-text-editor/toolbar/bold.tsx

import { useCommands, useActive } from "@remirror/react";

export const BoldButton = () => {
  const { toggleBold, focus } = useCommands();
  const active = useActive();

  return (
    <button
      type="button"
      onClick={() => {
        toggleBold();
        focus();
      }}
      className={`${active.bold() ? "bg-gray-200" : "hover:bg-gray-100"} rounded p-1`}
    >
      <svg
        xmlns="http://www.w3.org/2000/svg"
        height="18"
        width="18"
        viewBox="0 0 48 48"
        fill="black"
      >
        <path d="M14 36V8h11.4q3.3 0 5.725 2.1t2.425 5.3q0 1.9-1.05 3.5t-2.8 2.45v.3q2.15.7 3.475 2.5 1.325 1.8 1.325 4.05 0 3.4-2.625 5.6Q29.25 36 25.75 36Zm4.3-16.15h6.8q1.75 0 3.025-1.15t1.275-2.9q0-1.75-1.275-2.925Q26.85 11.7 25.1 11.7h-6.8Zm0 12.35h7.2q1.9 0 3.3-1.25t1.4-3.15q0-1.85-1.4-3.1t-3.3-1.25h-7.2Z" />
      </svg>
    </button>
  );
};