How to use the jest-config.readConfigs function in jest-config

): Promise<{
  results: AggregatedResult;
  globalConfig: Config.GlobalConfig;
}> => {
  const realFs = require('fs');
  const fs = require('graceful-fs');
  fs.gracefulify(realFs);

  let results: AggregatedResult | undefined;

  // If we output a JSON object, we can't write anything to stdout, since
  // it'll break the JSON structure and it won't be valid.
  const outputStream =
    argv.json || argv.useStderr ? process.stderr : process.stdout;

  const {globalConfig, configs, hasDeprecationWarnings} = readConfigs(
    argv,
    projects,
  );

  if (argv.debug) {
    logDebugMessages(globalConfig, configs, outputStream);
  }

  if (argv.showConfig) {
    logDebugMessages(globalConfig, configs, process.stdout);
    exit(0);
  }

  if (argv.clearCache) {
    configs.forEach(config => {
      rimraf.sync(config.cacheDirectory);