export const resolveWithPrefix = (
  resolver: string | undefined | null,
  {
    filePath,
    humanOptionName,
    optionName,
    prefix,
    rootDir,
  }: {
    filePath: string;
    humanOptionName: string;
    optionName: string;
    prefix: string;
    rootDir: Config.Path;
  },
) => {
  const fileName = replaceRootDirInPath(rootDir, filePath);
  let module = Resolver.findNodeModule(`${prefix}${fileName}`, {
    basedir: rootDir,
    resolver: resolver || undefined,
  });
  if (module) {
    return module;
  }

  try {
    return require.resolve(`${prefix}${fileName}`);
  } catch (e) {}

  module = Resolver.findNodeModule(fileName, {
    basedir: rootDir,
    resolver: resolver || undefined,
  });
  if (module) {
    return module;
  }

  try {
    return require.resolve(fileName);
  } catch (e) {}

  throw createValidationError(
    `  ${humanOptionName} ${chalk.bold(
      fileName,
    )} cannot be found. Make sure the ${chalk.bold(
      optionName,
    )} configuration option points to an existing node module.`,
  );
};

  options.reporters = reporters.map(reporterConfig => {
    const normalizedReporterConfig: Config.ReporterConfig =
      typeof reporterConfig === 'string'
        ? // if reporter config is a string, we wrap it in an array
          // and pass an empty object for options argument, to normalize
          // the shape.
          [reporterConfig, {}]
        : reporterConfig;

    const reporterPath = replaceRootDirInPath(
      options.rootDir,
      normalizedReporterConfig[0],
    );

    if (reporterPath !== DEFAULT_REPORTER_LABEL) {
      const reporter = Resolver.findNodeModule(reporterPath, {
        basedir: options.rootDir,
      });
      if (!reporter) {
        throw new Error(
          `Could not resolve a module for a custom reporter.\n` +
            `  Module name: ${reporterPath}`,
        );
      }
      normalizedReporterConfig[0] = reporter;
    }
    return normalizedReporterConfig;
  });

export const resolve = (
  resolver: string | null | undefined,
  {key, filePath, rootDir, optional}: ResolveOptions,
) => {
  const module = Resolver.findNodeModule(
    replaceRootDirInPath(rootDir, filePath),
    {
      basedir: rootDir,
      resolver: resolver || undefined,
    },
  );

  if (!module && !optional) {
    throw createValidationError(
      `  Module ${chalk.bold(filePath)} in the ${chalk.bold(
        key,
      )} option was not found.
         ${chalk.bold('<rootDir>')} is: ${rootDir}`,
    );
  }

  return module;
};