Lock/Unlock Saving for Gutenberg

index.js

/* global wp */

const {
  data: {
    dispatch,
  },
  plugins: {
    registerPlugin,
  },
} = wp;

// Quick and dirty lock/unlock of post saving.
function RequireField() {
  // Lock post saving.
  dispatch('core/editor').lockPostSaving();
  // Do some check.
  console.log('locked');
  // Unlock — Eventually when criteria is met.
  setTimeout(() => {
    dispatch('core/editor').unlockPostSaving();
    // Unlocked.
    console.log('unlocked');
  }, 5000);

  return false;
}

registerPlugin('plugin-name-here', {
  render: RequireField,
});