@atlaskit/adf-schema/dist/es2019/schema/nodes/to-json.js

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

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