@atlaskit/adf-schema/dist/es2019/schema/nodes/to-json-2.js

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

/**
 * There's no concept of optional property in ProseMirror. It sets value as `null`
 * when there's no use of any property. We are filtering out all private & optional attrs here.
 */
const optionalAttributes = ['occurrenceKey', 'width', 'height', 'url', 'alt', 'localId'];
const externalOnlyAttributes = ['type', 'url', 'width', 'height', 'alt', 'localId'];
export const toJSON = node => ({
  attrs: Object.keys(node.attrs)
  // Strip private attributes e.g. __fileName, __fileSize, __fileMimeType, etc.
  .filter(key => !(key[0] === '_' && key[1] === '_'))
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  .reduce((obj, key) => {
    if (node.attrs.type === 'external' && externalOnlyAttributes.indexOf(key) === -1) {
      return obj;
    }
    if (optionalAttributes.indexOf(key) > -1 && (node.attrs[key] === null || node.attrs[key] === '')) {
      return obj;
    }
    if (['width', 'height'].indexOf(key) !== -1) {
      obj[key] = Number(node.attrs[key]);
      return obj;
    }
    obj[key] = node.attrs[key];
    return obj;
  }, {})
});