Function readConfig

packages/jest-config/src/index.ts:80–121

(
  argv: Config.Argv,
  packageRootOrConfig: string | Config.InitialOptions,
  // Whether it needs to look into `--config` arg passed to CLI.
  // It only used to read initial config. If the initial config contains
  // `project` property, we don't want to read `--config` value and rather
  // read individual configs for every project.
  skipArgvConfigOption?: boolean,
  parentConfigDirname?: string | null,
  projectIndex = Number.POSITIVE_INFINITY,
  skipMultipleConfigError = false,
)

}

export async function readConfig(
  argv: Config.Argv,
  packageRootOrConfig: string | Config.InitialOptions,
  // Whether it needs to look into `--config` arg passed to CLI.
  // It only used to read initial config. If the initial config contains
  // `project` property, we don't want to read `--config` value and rather
  // read individual configs for every project.
  skipArgvConfigOption?: boolean,
  parentConfigDirname?: string | null,
  projectIndex = Number.POSITIVE_INFINITY,
  skipMultipleConfigError = false,
): Promise<ReadConfig> {
  const {config: initialOptions, configPath} = await readInitialOptions(
    argv.config,
    {
      packageRootOrConfig,
      parentConfigDirname,
      readFromCwd: skipArgvConfigOption,
      skipMultipleConfigError,
    },
  );

  const packageRoot =
    typeof packageRootOrConfig === 'string'
      ? path.resolve(packageRootOrConfig)
      : undefined;
  const {options, hasDeprecationWarnings} = await normalize(
    initialOptions,
    argv,
    configPath,
    projectIndex,
    skipArgvConfigOption && !(packageRoot === parentConfigDirname),
  );

  const {globalConfig, projectConfig} = groupOptions(options);
  return {
    configPath,
    globalConfig,
    hasDeprecationWarnings,
    projectConfig,
  };
}

const groupOptions = (
  options: Config.ProjectConfig & Config.GlobalConfig,