@gasket/plugin-nextjs/lib/utils/config.js

Adds Next support to your application

/// <reference types="@gasket/plugin-intl" />
/// <reference types="@gasket/plugin-logger" />

/**
 * Bring forward configuration from intl plugin to config for next.
 * @param {import('@gasket/core').Gasket} gasket - The gasket API
 * @param {object} config - Configuration to pass to Nextjs
 * @private
 */
function forwardIntlConfig(gasket, config) {
  const { logger } = gasket;

  const { intl: intlConfig } = gasket.config;

  if (intlConfig?.nextRouting === false) {
    return;
  }

  // make a copy of i18n for mutating
  const i18n = { ...(config.i18n || {}) };

  if (intlConfig?.locales) {
    if (i18n.locales) {
      logger.warn(
        'Gasket config has both `intl.locales` (preferred) and `nextConfig.i18n.locales`'
      );
    }
    i18n.locales = intlConfig.locales;

    if (i18n.defaultLocale) {
      logger.warn(
        'Gasket config has both `intl.defaultLocale` (preferred) and `nextConfig.i18n.defaultLocale`'
      );
    }
    i18n.defaultLocale = intlConfig.defaultLocale;

    config.i18n = i18n;
  }
}

/**
 * Small helper function that creates nextjs configuration from the gasket
 * configuration.
 * @param {import('@gasket/core').Gasket}  gasket The gasket API.
 * @param {import('next').NextConfig} nextConfig The nextjs configuration.
 * @returns {Promise<import('next').NextConfig>} configuration data for nextjs.
 * @private
 */
async function createConfig(gasket, nextConfig = {}) {
  const config = {
    poweredByHeader: false,
    ...(gasket.config?.nextConfig || {}),
    ...nextConfig
  };

  forwardIntlConfig(gasket, config);

  const { webpack: existingWebpack } = config;

  // Add webpack property to nextConfig and wrap existing
  config.webpack = function webpack(webpackConfig, data) {
    if (typeof existingWebpack === 'function') {
      webpackConfig = existingWebpack(webpackConfig, data);
    }
    return gasket.actions.getWebpackConfig(webpackConfig, data);
  };

  return await gasket.execWaterfall('nextConfig', config);
}

module.exports = {
  createConfig
};