processConfig.ts

import type { Configuration } from 'webpack';

import { ConfigurationFactory } from '../WebpackConfig.js';

const trivialConfigurationFactory =
  (config: Configuration): ConfigurationFactory =>
  () =>
    config;

export type ConfigProcessor = (
  config: ConfigurationFactory,
) => Promise<Configuration>;

// Ensure processing logic is run for both `Configuration` and
// `ConfigurationFactory` config variants.
const processConfig = async (
  processor: ConfigProcessor,
  config: Configuration | ConfigurationFactory,
): Promise<Configuration> => {
  const configFactory =
    typeof config === 'function' ? config : trivialConfigurationFactory(config);
  return processor(configFactory);
};

export default processConfig;