@storybook/api/dist/modern/lib/events.js

import { logger } from '@storybook/client-logger';
import { getSourceType } from '../modules/refs';
export const getEventMetadata = (context, fullAPI) => {
  const {
    source,
    refId,
    type
  } = context;
  const [sourceType, sourceLocation] = getSourceType(source, refId);
  const ref = refId && fullAPI.getRefs()[refId] ? fullAPI.getRefs()[refId] : fullAPI.findRef(sourceLocation);
  const meta = {
    source,
    sourceType,
    sourceLocation,
    refId,
    ref,
    type
  };

  switch (true) {
    case typeof refId === 'string':
    case sourceType === 'local':
    case sourceType === 'external':
      {
        return meta;
      }
    // if we couldn't find the source, something risky happened, we ignore the input, and log a warning

    default:
      {
        logger.warn(`Received a ${type} frame that was not configured as a ref`);
        return null;
      }
  }
};