'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var promises = require('fs/promises');

function equals(options = {}) {
  const {
    file: filename,
    replace = 'export = $1'
  } = options;
  const captureIdPattern = '([a-zA-Z$_][\\w$_]*)';
  const strings = [`export default ${captureIdPattern}`, `export { ${captureIdPattern} as default }`];
  const patterns = strings.map(str => new RegExp(str));
  const replaceExport = code => {
    for (const pattern of patterns) {
      if (pattern.test(code)) {
        return code.replace(pattern, replace);
      }
    }
    return code;
  };
  return {
    name: 'export-equals',
    renderChunk(code) {
      if (filename) {
        return;
      }
      return replaceExport(code);
    },
    async writeBundle() {
      if (!filename) {
        return;
      }
      const content = await promises.readFile(filename, 'utf-8');
      await promises.writeFile(filename, replaceExport(content));
    }
  };
}

exports.equals = equals;
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