@atlaskit/adf-schema/dist/esm/schema/nodes/to-json.js

Shared package that contains the ADF-schema (json) and ProseMirror node/mark specs

export var toJSON = function toJSON(node) {
  return {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    attrs: Object.keys(node.attrs).reduce(function (obj, key) {
      if (node.attrs[key] !== null) {
        obj[key] = node.attrs[key];
      }
      return obj;
    }, {})
  };
};