plugin-preloader/src/utils/transform/babelConfig.ts

This library dynamically preloads and installs Babel and ESLint plugins and presets based on your configuration, streamlining the build process without the need to include them as dependencies in your project.

import log from "fancy-log";
import { BabelConfig, Entity } from "@core/types";

function transformBabelConfig(config: BabelConfig): Entity[] {
  const itemsToProcess = new Map();

  const { presets = [], plugins = [], env = {} } = config;

  const pluginsAndPresets = [
    ...(Array.isArray(presets) ? presets : []),
    ...(Array.isArray(plugins) ? plugins : []),
  ];

  Object.values(env).forEach((envConfig) => {
    pluginsAndPresets.push(
      ...(Array.isArray(envConfig.plugins) ? envConfig.plugins : []),
      ...(Array.isArray(envConfig.presets) ? envConfig.presets : [])
    );
  });

  for (const pluginOrPreset of pluginsAndPresets) {
    if (typeof pluginOrPreset === "string") {
      if (!itemsToProcess.has(pluginOrPreset)) {
        itemsToProcess.set(pluginOrPreset, pluginOrPreset);
      }
    } else if (Array.isArray(pluginOrPreset)) {
      if (!itemsToProcess.has(pluginOrPreset[0])) {
        itemsToProcess.set(
          pluginOrPreset[0],
          typeof pluginOrPreset[3] === "string"
            ? [pluginOrPreset[0], pluginOrPreset[3]]
            : pluginOrPreset[0]
        );
      }
    } else {
      log.error("This type of declaring the plugin is not supported yet");
    }
  }

  return [...itemsToProcess.values()];
}

export default transformBabelConfig;