prettier-plugin-imports/src/utils/get-experimental-parser-plugins.ts

A prettier plugins to sort imports in provided RegEx order

import type { ParserPlugin, ParserPluginWithOptions } from '@babel/parser';

/**
 * Returns a list of babel parser plugin names
 *
 * @param importOrderParserPlugins Array of experimental babel parser plugins
 * @returns List of parser plugins to be passed to babel parser
 */
export const getExperimentalParserPlugins = (
  importOrderParserPlugins: string[],
): ParserPlugin[] => {
  return importOrderParserPlugins.map((pluginNameOrJson) => {
    // ParserPlugin can be either a string or and array of [name: string, options: object]
    // in prettier options the array will be sent in a JSON string
    const isParserPluginWithOptions = pluginNameOrJson.startsWith('[');

    let plugin: ParserPlugin;
    if (isParserPluginWithOptions) {
      try {
        plugin = JSON.parse(pluginNameOrJson) as ParserPluginWithOptions;
      } catch (e) {
        throw Error(
          'Invalid JSON in importOrderParserPlugins: ' + pluginNameOrJson,
        );
      }
    } else {
      plugin = pluginNameOrJson as ParserPlugin;
    }

    return plugin;
  });
};

/**
 * Checks whether a specified plugin is included in importOrderParserPlugins.
 * More fancy than just a `.includes()` because importOrderParserPlugins can
 * contain plugins with configuration
 *
 * @param importOrderParserPlugins Array of experimental babel parser plugins
 * @returns True if the plugin is in the list
 */
export const hasPlugin = (
  importOrderParserPlugins: string[],
  pluginName: string,
): boolean => {
  for (const pluginNameOrJson of importOrderParserPlugins) {
    const isParserPluginWithOptions = pluginNameOrJson.startsWith('[');
    let plugin;

    if (isParserPluginWithOptions) {
      try {
        plugin = JSON.parse(pluginNameOrJson)[0];
      } catch (e) {
        throw Error(
          'Invalid JSON in importOrderParserPlugins: ' + pluginNameOrJson,
        );
      }
    } else {
      plugin = pluginNameOrJson as ParserPlugin;
    }
    if (plugin === pluginName) return true;
  }
  return false;
};