'use strict';

var pluginutils = require('@rollup/pluginutils');
var istanbul = require('istanbul-lib-instrument');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var istanbul__default = /*#__PURE__*/_interopDefaultLegacy(istanbul);

function index (options = {}) {
  const filter = pluginutils.createFilter(options.include, options.exclude);

  return {
    name: 'istanbul',
    transform (code, id) {
      if (!filter(id)) return;

      let instrumenter;
      const instrumenterConfig = Object.assign({
        esModules: true,
        compact: true,
        produceSourceMap: true,
        autoWrap: true,
        preserveComments: true
      }, options.instrumenterConfig);

      instrumenter = new (options.instrumenter || istanbul__default['default']).createInstrumenter(instrumenterConfig);

      code = instrumenter.instrumentSync(code, id);
      const map = instrumenter.lastSourceMap();

      return { code, map };
    }
  };
}

module.exports = index;